Power converter and power converter control method

文档序号：365208 发布日期：2021-12-07 浏览：24次中文

阅读说明：本技术 电源变换器及电源变换器控制方法 (Power converter and power converter control method ) 是由郭宏孙高阳徐金全何旭张志国赵雅周李德洪鞠来财于 2021-10-20 设计创作，主要内容包括：本公开涉及航空电源系统技术领域,尤其涉及一种电源变换器及其控制方法。通过由控制电路生成的控制信号控制三相全桥电路功率器件的开闭,实现对永磁辅助式同步磁阻起动发电机交、直轴电流的控制,进而对其转矩和功率进行双向控制,使永磁辅助式同步磁阻起动发电机适用于航空高压直流起动发电电源系统。电源变换器采用一套功率器件即可实现永磁辅助式同步磁阻起动发电机的起动和发电功能,具有功率密度高、效率高、电源系统动静态性能良好等优点。(The disclosure relates to the technical field of aviation power supply systems, in particular to a power supply converter and a control method thereof. The control signal generated by the control circuit controls the on-off of the three-phase full-bridge circuit power device, so that the alternating current and direct current of the permanent magnet auxiliary type synchronous reluctance starter generator are controlled, the torque and the power of the permanent magnet auxiliary type synchronous reluctance starter generator are controlled in a two-way mode, and the permanent magnet auxiliary type synchronous reluctance starter generator is suitable for an aviation high-voltage direct current starting power generation power supply system. The power converter can realize the starting and generating functions of the permanent magnet auxiliary type synchronous reluctance starting generator by adopting a set of power devices, and has the advantages of high power density, high efficiency, good dynamic and static performances of a power system and the like.)

1. A power converter, characterized in that the power converter comprises: the three-phase full-bridge circuit comprises a three-phase full-bridge circuit, a driving circuit and a control circuit;

the three-phase full-bridge circuit comprises three half-bridge circuits, wherein first bridge arms of the three half-bridge circuits are respectively connected with the positive electrode of the direct current bus, second bridge arms of the three half-bridge circuits are respectively connected with the negative electrode of the direct current bus, and the three half-bridge circuits are respectively connected with three phases of the starter/generator;

the input side of the driving circuit is connected with the control circuit, and the output side of the driving circuit is respectively connected with the three half-bridge circuits of the three-phase full-bridge circuit;

the control circuit is configured to generate a control signal for the three-phase full-bridge circuit according to phase current of the starting/generating machine, direct-current bus current, direct-current bus voltage and starting/generating machine position information, and a starting mode control instruction or a generating mode control instruction sent to the control circuit by the upper computer;

the driving circuit is configured to drive the power devices of the three-phase full bridge circuit according to the control signal.

2. The power converter according to claim 1, wherein the power converter comprises a filter capacitor and/or a support capacitor, the filter capacitor is connected between the positive electrode and the negative electrode of the dc bus, the support capacitor is connected between the positive electrode and the negative electrode of the dc bus, and the support capacitor is disposed between the filter capacitor and the power distribution system.

3. The power converter of claim 1, wherein the power converter includes a starter/generator phase current sensor, a dc bus current sensor, and a dc bus voltage sensor;

the generator/starter phase current sensor is connected with a phase line of the generator/starter and is connected with the control circuit, and the generator/starter phase current sensor is configured to convert the phase current of the generator/starter into a first sampling voltage signal;

the direct current bus current sensor is connected with the negative electrode of the direct current bus, the direct current bus current sensor is connected with the control circuit, and the direct current bus current sensor is configured to convert direct current bus current into a second sampling voltage signal;

the direct current bus voltage sensor is connected with the positive electrode and the negative electrode of the direct current bus, the direct current bus voltage sensor is connected with the control circuit, and the direct current bus voltage sensor is configured to convert direct current bus voltage into a third sampling voltage signal.

4. The power converter of claim 3, wherein the control circuit comprises a first sampling circuit, a second sampling circuit, and a third sampling circuit;

the first sampling circuit is connected with the starter/generator phase current sensor, and the first sampling circuit is configured to receive the first sampled voltage signal;

the second sampling circuit is connected with the direct current bus current sensor, and the second sampling circuit is configured to receive the second sampling voltage signal;

the third sampling circuit is connected to the dc bus voltage sensor, and the third sampling circuit is configured to receive the third sampled voltage signal.

5. The power converter according to any one of claims 1-4, wherein the control circuit comprises a main control chip configured to generate a control signal for the three-phase full bridge circuit according to a phase current of the starter/generator, a DC bus current, a DC bus voltage and starter/generator position information, and a start mode control command or a generation mode control command sent by an upper computer to the control circuit.

6. A method of controlling a power converter, the method comprising:

converting the phase current of the starting/generating machine into d and q axis currents of the starting/generating machine through coordinate system conversion;

distributing the starting/generating machine stator current instruction to a d-q coordinate system through a current distribution strategy to obtain d and q axis current inner ring instructions of the starting/generating machine;

performing PI calculation on the difference values of the d-axis current and the q-axis current and the d-axis current inner loop instruction and the q-axis current inner loop instruction to obtain d-axis voltage instructions and q-axis voltage instructions;

converting the d-axis voltage command and the q-axis voltage command into alpha-axis voltage commands and beta-axis voltage commands through coordinate system conversion;

and modulating the alpha and beta axis voltage commands into control signals for a three-phase full bridge circuit in the power converter through SVPWM (space vector pulse width modulation), wherein the three-phase full bridge circuit is connected with a starter/generator.

7. The power converter control method according to claim 6, wherein, in an engine start phase,

controlling a double-multiplexer to gate a constant stator current value to serve as a stator current instruction of the starting/generating machine so as to control the starting/generating machine to generate constant torque to drive the engine to start;

and when the rotating speed of the starter/generator exceeds the switching rotating speed, controlling a double-multiplexer gating power closed-loop calculated value to serve as a stator current instruction of the starter/generator so as to control the starter/generator to generate constant power to drive the engine to start until the engine reaches the ignition rotating speed.

8. The power converter control method according to claim 7, wherein, during the starter/generator voltage-buildup mode control phase,

based on a first control instruction sent by an upper computer, the starting/generating machine is switched from an uncontrolled state to a current inner ring closed-loop control state, and after the starting/generating machine is switched to the current inner ring closed-loop control state, the starting/generating machine stator current instruction is 0A;

based on a second control instruction sent by the upper computer, the starting/generating set is switched from a current inner ring closed-loop control state to a voltage outer ring closed-loop control state, and after the starting/generating set is switched to the voltage outer ring closed-loop control state, voltage loop PI calculation is carried out based on a difference value of a first direct current bus voltage instruction and direct current bus real-time feedback voltage to obtain a starting/generating set stator current instruction;

based on a third control instruction sent by the upper computer, the starting/power generator keeps a voltage outer ring control state, and the first direct current bus voltage instruction is increased to a preset voltage on a sloping land.

9. The power converter control method according to claim 8, wherein, in a starter/generator voltage stabilization power generation stage,

taking the preset voltage as a second direct current bus voltage instruction, and taking the direct current bus real-time voltage as feedback to obtain a voltage loop PI calculated value;

acquiring a direct-current bus current feedforward instruction according to the direct-current bus current;

and acquiring the stator current instruction of the starting/generating machine according to the voltage loop PI calculated value and the direct current bus current feedforward instruction.

10. A computer readable storage medium having stored therein computer program instructions which, when executed by a processor of a user equipment, cause the user equipment to perform the power converter control method of any of claims 6-9.

Technical Field

The disclosure relates to the technical field of aviation power supply systems, in particular to a power converter and a power converter control method.

Background

Multi-electric aircraft and all-electric aircraft are inevitable trends in aviation development. The multi-power/full-power operation of an aircraft greatly increases the power consumption of its load, which puts more stringent requirements on the capacity, reliability and power quality of the on-board power supply system. At present, the aeronautical high-voltage power supply system mainly comprises two types, namely 115V three-phase alternating current and 270V direct current. Compared with three-phase alternating current, the high-voltage direct current system is more beneficial to reducing the volume and weight of a power supply system, a power distribution system and electric equipment. Furthermore, as pneumatic and hydraulic systems are increasingly being replaced by electrical systems, the task of starting aircraft engines also falls on electrical systems. Therefore, the development of a high-performance 270V high-voltage direct-current power supply system with a starting function is the key for developing a multi-electric/full-electric airplane.

The starting power generation power supply system (starting/power generation source system) includes a starter generator (starting/power generator) and a power supply converter. The permanent magnet auxiliary type synchronous reluctance motor not only has the advantages of high power density and high efficiency, but also has the advantages of small short-circuit current, high reliability and the like, so that the permanent magnet auxiliary type synchronous reluctance motor has the potential of being applied to a high-performance starting/generating source system. At present, a permanent magnet auxiliary type synchronous reluctance motor is applied to the fields of electric automobiles and the like, and if the permanent magnet auxiliary type synchronous reluctance motor needs to be applied to an aviation starting/generating power source system, a power source converter needs to be developed in a matched mode.

Disclosure of Invention

In order to meet the requirement of the aviation field on a high-performance starting/generating power source system, the embodiment of the disclosure provides a power converter suitable for a permanent magnet auxiliary type synchronous reluctance starting/generating machine and a control method of the power converter.

In one aspect, an embodiment of the present disclosure provides a power converter, including: the three-phase full-bridge circuit comprises a three-phase full-bridge circuit, a driving circuit and a control circuit;

the driving circuit is configured to drive the power devices of the three-phase full bridge circuit according to the control signal.

Optionally, the power converter includes a filter capacitor and/or a support capacitor, the filter capacitor is connected between the positive electrode and the negative electrode of the dc bus, the support capacitor is connected between the positive electrode and the negative electrode of the dc bus, and the support capacitor is disposed between the filter capacitor and the power distribution system.

Optionally, the power converter comprises a starter/generator phase current sensor, a dc bus current sensor and a dc bus voltage sensor;

Optionally, the control circuit comprises a first sampling circuit, a second sampling circuit and a third sampling circuit;

the first sampling circuit is connected with the starter/generator phase current sensor, and the first sampling circuit is configured to receive the first sampled voltage signal;

the second sampling circuit is connected with the direct current bus current sensor, and the second sampling circuit is configured to receive the second sampling voltage signal;

the third sampling circuit is connected to the dc bus voltage sensor, and the third sampling circuit is configured to receive the third sampled voltage signal.

Optionally, the control circuit includes a main control chip configured to generate a control signal to the three-phase full bridge circuit according to a phase current of the starting/generating device, a dc bus current, a dc bus voltage, and starting/generating device position information, and a starting mode control instruction or a generating mode control instruction sent by an upper computer to the control circuit.

In another aspect, an embodiment of the present disclosure provides a power converter control method, where the method includes:

converting the phase current of the starting/generating machine into d and q axis currents of the starting/generating machine through coordinate system conversion;

converting the d-axis voltage command and the q-axis voltage command into alpha-axis voltage commands and beta-axis voltage commands through coordinate system conversion;

Alternatively, during the engine start-up phase,

Alternatively, during the start/generator boost mode control phase,

Alternatively, in the voltage-stabilizing power generation stage of the starter/generator,

taking the preset voltage as a second direct current bus voltage instruction, and taking the direct current bus real-time voltage as feedback to obtain a voltage loop PI calculated value;

acquiring a direct-current bus current feedforward instruction according to the direct-current bus current;

and acquiring the stator current instruction of the starting/generating machine according to the voltage loop PI calculated value and the direct current bus current feedforward instruction.

In yet another aspect, the present disclosure provides a computer-readable storage medium, in which computer program instructions are stored, and when the computer program instructions are executed by a processor of a user equipment, the user equipment is caused to execute any one of the above power converter control methods.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least can include:

the alternating current side of the power converter is connected with the starting/generating machine, the direct current side of the power converter is connected with the direct current power supply, and the control signal generated by the power converter control circuit controls the on-off of the three-phase full-bridge circuit power device, so that the alternating current and the direct current of the starting/generating machine can be controlled, the torque and the power of the starting/generating machine can be controlled in a two-way mode, and the starting/generating machine system is suitable for an aviation high-voltage direct current starting/generating source system.

Drawings

In order to more clearly illustrate the embodiments or prior art solutions of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are included in and constitute a part of this specification, and other drawings can be obtained by those skilled in the art without inventive effort from these drawings. For convenience of description, only portions relevant to the present disclosure are shown in the drawings.

Fig. 1 is a schematic diagram of a power converter according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a connection of a power converter in an aircraft electrical system provided by an embodiment of the disclosure;

FIG. 3 is a schematic diagram of a current inner loop control structure of a permanent magnet assisted synchronous reluctance starter/generator;

FIG. 4 is a schematic diagram of a permanent magnet assisted synchronous reluctance start/generator start mode control architecture;

FIG. 5 is a flow chart of a permanent magnet assisted synchronous reluctance start/generator voltage build mode control method;

FIG. 6 is a schematic diagram of a permanent magnet assisted synchronous reluctance starter/generator voltage stabilization power generation mode control architecture.

Reference numerals: 100-power converter, 101-drive circuit, 102-filter capacitor, 103-support capacitor, 104-start/generator phase current sensor, 105-direct current bus current sensor, 106-direct current bus voltage sensor, 107-on-board computer, 108-three-phase full bridge circuit, 200-control circuit, 201-first sampling circuit, 202-second sampling circuit, 203-third sampling circuit, 204-main control chip, 205-rotary transformation decoding circuit, 206-PWM circuit, 207-communication circuit, 208-power circuit, 300-start/generator, 400-engine, 500-start power supply, 600-electric equipment, 700-power distribution system, 800-current limiting resistor.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some embodiments of the present disclosure, not all embodiments, and features in the embodiments and implementations in the present disclosure may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations or steps as a sequential process, many of the operations can be performed in parallel, concurrently, or simultaneously. In addition, the order of various operations or steps may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.

The methods provided by some embodiments of the present disclosure may be executed by a processor, and are all described below by taking the processor as an example of an execution subject. The execution subject may be adjusted according to the actual application, for example, the execution subject may be a server, an electronic device, a computer, or the like. More specifically, one or more steps of the methods provided by the embodiments of the present disclosure may be performed by computer program instructions adapted to be executed by a processor.

An embodiment of the present disclosure provides a power converter, which includes a three-phase full bridge circuit, a driving circuit, and a control circuit;

the three-phase full-bridge circuit comprises three half-bridge circuits, wherein first bridge arms of the three half-bridge circuits are respectively connected with the anode of the direct current bus, second bridge arms of the three half-bridge circuits are respectively connected with the cathode of the direct current bus, and the three half-bridge circuits are respectively connected with three phases of the starter/generator;

the driving circuit is configured to drive the power devices of the three-phase full-bridge circuit according to the control signal generated by the control circuit to the three-phase full-bridge circuit.

Fig. 1 shows a schematic structural diagram of a power converter provided by an embodiment of the present disclosure, and fig. 2 shows a connection manner of the power converter provided by the embodiment of the present disclosure in an aircraft electrical system. As shown in fig. 2, the aircraft electrical system is composed of an engine 400, a starter/generator 300, a power converter 100, a starting power supply 500, a power distribution system 700, and a consumer 600. The ac side (right side) of the power converter 100 is connected to the phase line of the starter/generator 300, and the dc side (left side) of the power converter 100 is connected to the power distribution system 700 and the starting power supply 500 through the breaker QF, the contactor KM, and the current limiting resistor 800. The power distribution system 700 is used to transmit the electric power outputted from the starter/generator 300 and the power converter 100 to the electric device 600, and the starting power supply 500 is used to provide the energy required for the starting phase. The starting power supply 500 may be an external power supply or an on-board battery, the voltage may be 270V, and the shaft of the starter/generator 300 and the engine 400 may be coaxially connected. If not stated otherwise, the starting/generating machines related to the embodiments of the present disclosure may be permanent magnet assisted synchronous reluctance starting generators, and the engines may be aircraft engines.

As shown in fig. 1, the three-phase full bridge circuit 108 in the power converter provided by the embodiment of the present disclosure is a main actuator for starting and generating power by the starter/generator. Illustratively, as shown in fig. 1, the three-phase full bridge circuit 108 may be composed of 6 fully-controlled power devices, each two fully-controlled power devices may be connected to form a half bridge circuit, and three half bridge circuits may have three connection points connected to the phase lines of the generator/starter. The power device of the three-phase full bridge circuit may be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT).

When the power devices of the three-phase full-bridge circuit are MOSFETs, the source (S level) of the upper bridge arm of the half-bridge circuit and the drain (D level) of the lower bridge arm of the half-bridge circuit can be connected to form a half-bridge circuit, 6 power devices can form 3 half-bridge circuits, the drain (D level) of the first bridge arm (such as the upper bridge arm) of the three half-bridge circuits can be connected to the anode of the direct-current bus, and the source (S level) of the second bridge arm (such as the lower bridge arm) of the three half-bridge circuits can be connected to the cathode of the direct-current bus, so that the three-phase full-bridge circuit is formed.

When the power devices of the three-phase full-bridge circuit are IGBTs, the emitter (E level) of the upper bridge arm of the half-bridge circuit and the collector (C level) of the lower bridge arm of the half-bridge circuit can be connected to form a half-bridge circuit, 6 power devices can form 3 half-bridge circuits, the collector (C level) of the first bridge arm (such as the upper bridge arm) of the three half-bridge circuits can be connected to the positive electrode of a direct-current bus, and the emitter (E level) of the second bridge arm (such as the lower bridge arm) of the three half-bridge circuits can be connected to the negative electrode of the direct-current bus, so that the three-phase full-bridge circuit is formed.

In one possible implementation, high frequency switching of the power device may cause a large number of harmonics of the switching frequency to be generated in the circuitry of the power converter, resulting in ripple on the dc side voltage of the power converter. To suppress the voltage ripple, a filter capacitor 102 may be attached to the dc side of the power converter, as shown in fig. 1, and the filter capacitor 102 may be connected between the positive and negative poles of the dc bus. In order to improve the filtering effect, the filter capacitor can be a thin film capacitor with lower Equivalent Series Resistance (ESR) and equivalent series inductance (ESL), and the filter capacitor can be close to the three-phase full bridge circuit as far as possible when the circuit arrangement is completed, so that the distance between the filter capacitor and the three-phase full bridge circuit can meet a preset threshold value. The lowest capacitance value C of the filter capacitor can be approximately calculated by the following formula:

in the formula, P_LoadIs the power of all the electrical equipment in the aircraft electrical system; (1-D) is the duty ratio of a 0 vector when an SVPWM modulation method is adopted, and the value of the duty ratio can be obtained through simulation or calculation; u. of_{ripple_limit}Is a limit value of the DC bus voltage ripple amplitude, U_dcIs the value of the DC bus voltage, f_PWMFor controlling the switching frequency of the PWM circuit in the circuit.

In a possible implementation manner, in practical applications, if the filter capacitor cannot be close to the three-phase full bridge circuit due to space structure limitation, the three-phase full bridge circuit may generate an excessive voltage overshoot due to a line parasitic inductance. To suppress this voltage overshoot, a snubber capacitor (not shown in the drawing) may be connected in parallel to the half-bridge circuit of the three-phase full-bridge circuit. In order to improve the absorption effect, a thin film capacitor or a ceramic capacitor with lower ESL can be selected as the absorption capacitor, and two ends of the absorption capacitor can be as close to the drain (or collector) of the upper bridge arm and the source (or emitter) of the lower bridge arm of the half-bridge circuit as possible.

In a possible implementation manner, in order to improve transient performance of the power supply system and suppress voltage drop and pumping-up of the dc side of the power converter during sudden loading/unloading of the electric equipment, as shown in fig. 1, a supporting capacitor 103 may be connected in parallel on the dc side of the power converter, and the supporting capacitor 103 may be connected between the positive electrode and the negative electrode of the dc bus. In order to improve the power density of the power converter, the support capacitor can be an electrolytic capacitor with higher capacitance value density. As shown in fig. 1 and 2, the support capacitor 103 may be disposed beside the filter capacitor 102 near the side of the power distribution system 700, i.e., the support capacitor 103 may be disposed between the filter capacitor 102 and the power distribution system 700. The capacitance value of the supporting capacitor can be comprehensively selected according to the sudden load/load shedding power and the dynamic performance of the system or determined by a simulation method.

In one possible implementation, as shown in fig. 1, the present embodiment provides a power converter including a starter/generator phase current sensor 104, a dc bus current sensor 105, and a dc bus voltage sensor 106.

As shown in fig. 1, the starter/generator phase current sensor 104 is mounted on the phase line of the starter/generator 300, or the starter/generator phase current sensor 104 is connected to the phase line of the starter/generator 300, and the starter/generator phase current sensor 104 is further connected to the control circuit 200. The starter/generator phase current sensor is configured to convert a starter/generator phase current into a voltage signal required by the sampling circuit, i.e., to convert the starter/generator phase current into a sampled voltage signal, and to transmit the sampled voltage signal to the control circuit. For the sake of convenience of distinction, the sampled voltage signal may be referred to as a first sampled voltage signal. Since the motor winding usually adopts a Y-connection method, generally only two phase currents of the starter/generator need to be sampled, that is, only two phase current sensors can be installed on two phase lines of the starter/generator, or only two phase current sensors can be respectively connected with two phase lines of the starter/generator.

As shown in fig. 1, the dc bus current sensor 105 is connected to the negative electrode of the dc bus, and the dc bus current sensor 105 is connected to the control circuit 200. The dc bus current sensor 105 is configured to convert the dc bus current into a voltage signal required by the sampling circuit, i.e., convert the dc bus current into a sampled voltage signal, and send the sampled voltage signal to the control circuit. For the sake of convenience of distinction, the sampled voltage signal may be referred to as a second sampled voltage signal.

As shown in fig. 1, the dc bus voltage sensor 106 is connected to the positive and negative poles of the dc bus, and the dc bus voltage sensor 106 is connected to the control circuit 200. The DC bus voltage sensor is configured to measure a DC bus voltage U of a high voltage_dcThe sampling circuit converts the voltage into a low-voltage signal which accords with the voltage sampling range of the sampling circuit, namely converts the direct-current bus voltage into a sampling voltage signal and sends the sampling voltage signal to the control circuit. For ease of distinction, this low voltage signal may be referred to as a third sampled voltage signal. The DC bus voltage sensor can divide, filter, isolate, amplify and filter the high-voltage DC bus voltage U through the resistance_dcAnd converting the voltage signal into a low-voltage signal which accords with the voltage sampling range of the sampling circuit.

In one possible implementation, as shown in fig. 1, the control circuit 200 includes a first sampling circuit 201, a second sampling circuit 202, and a third sampling circuit 203. The first sampling circuit 201 may be connected to the starting/generator phase current sensor 104, and the first sampling circuit 201 is configured to receive a first sampling voltage signal sent by the starting/generator phase current sensor 104; the second sampling circuit 202 may be connected to the dc bus current sensor 105, and the second sampling circuit 202 is configured to receive a second sampling voltage signal sent by the dc bus current sensor 105; the third sampling circuit 203 may be connected to the dc bus voltage sensor 106, and the third sampling circuit 203 is configured to receive a third sampled voltage signal sent by the dc bus voltage sensor 106.

In one possible implementation, as shown in fig. 1, the control circuit 200 may include a main control chip 204, and the main control chip 204 may receive various signals collected by other circuits or components in the control circuit 200. The main control chip can be loaded with a plurality of algorithms, one or more of the algorithms can be used for generating control signals for the three-phase full-bridge circuit according to the first sampling voltage signal, the second sampling voltage signal, the third sampling voltage signal and the position information of the starting/generating machine and a starting mode control command or a generating mode control command sent by the upper computer to the control circuit, namely generating control signals for the three-phase full-bridge circuit according to the phase current of the starting/generating machine, the direct current bus current, the direct current bus voltage and the position information of the starting/generating machine and the starting mode control command or the generating mode control command sent by the upper computer to the control circuit. For example, the master control chip may include a memory and a processor. The processor may be implemented using a general purpose CPU (Central Processing Unit), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits. The memory may have stored therein computer program instructions adapted to be executed by the processor, which when executed by the processor, implement the various algorithms. In addition, the memory may also be used to store signal data generated in each circuit or component included in the control circuit. As shown in fig. 1, the position information of the starter/generator 300 can be obtained by a resolver on the starter/generator 300 and transmitted to the resolver decoding circuit 205 of the control circuit 200 and decoded by the resolver decoding circuit 205. When the starter/generator is a permanent magnet assisted synchronous reluctance starter/generator, the resolver decoder circuit of the control circuit may interface with a resolver on the starter/generator through a reluctance encoder and an auxiliary winding. In practical application, the upper computer can send a starting mode control command to the control circuit in the starting stage of the starting/generating machine, namely when the starting/generating machine needs to be started; the upper computer may transmit the power generation mode control command to the control circuit at a power generation stage of the starter/generator, i.e., when power generation by the starter/generator is required.

In a possible implementation manner, a starting control algorithm and a voltage-stabilizing power generation control algorithm can be loaded in a main control chip of the control circuit. Wherein, the starting control algorithm can be used for generating a control signal (PWM signal) to the three-phase full bridge circuit in the starting phase of the starting/power generator, and the voltage-stabilizing power generation control algorithm can be used for generating a control signal (PWM signal) to the three-phase full bridge circuit in the voltage-stabilizing power generation phase of the starting/power generator. The control signal for the three-phase full-bridge circuit actually refers to a control (switching) signal for 6 power devices in the three-phase full-bridge circuit. As shown in fig. 1, the control circuit may include a PWM circuit 206, and the input side of the drive circuit 101 in the power converter may be connected to the PWM circuit 206 of the control circuit. The control signal to the three-phase full-bridge circuit generated by the main control chip 204 can be sent to the driving circuit 101 through the PWM circuit 206, the driving circuit 101 can drive 6 power devices of the three-phase full-bridge circuit according to the received control signal, that is, the input of the driving circuit 101 is the PWM signal of the control circuit, the output of the driving circuit 101 is the driving signal to the power devices, so that the driving circuit 101 can drive the power devices of the three-phase full-bridge circuit 108 according to the control signal to the three-phase full-bridge circuit 108 generated by the control circuit 200.

In a possible implementation manner, whether the current and the voltage in the circuit included in the power converter and the circuit included in the control circuit exceed a current preset value or a voltage preset value or not can be judged through an algorithm loaded in the main control chip, and when the current and the voltage exceed the current preset value or the voltage preset value, a PWM (pulse width modulation) blocking signal for the power tube and/or a turn-off signal for the circuit breaker can be sent out, so that the circuits are protected. It will be appreciated that the specific values of the current preset value and the voltage preset value may vary from circuit to circuit. In addition, as shown in fig. 1, the control circuit 200 may include a communication circuit 207, and the control circuit 200 may communicate with the upper computer 107 (on-board computer, etc.) through the communication circuit 207. For example, the signal data collected or generated by the control circuit may be sent to the upper computer, and the control circuit may also receive an instruction signal sent by the upper computer, for example, a start mode control instruction or a power generation mode control instruction sent by the upper computer. Wherein, communication circuit and host computer can be through communication interface connection. As shown in fig. 1, the control circuit 200 may further include a power circuit 208, and the power circuit 208 may be connected to a dc bus or other power source so that power support may be provided to the control circuit 200 via the power circuit 208.

According to the power converter provided by the embodiment of the disclosure, the alternating current side of the power converter is connected with the starter/generator, the direct current side of the power converter is connected with the direct current power supply, and the control signal generated by the control circuit controls the on/off of the three-phase full bridge circuit power device, so that the alternating current and direct current of the starter/generator can be controlled, the torque and the power of the starter/generator can be controlled in a two-way manner, and the starter/generator system is suitable for an aviation high-voltage direct current starter/generator system.

The power converter provided by the embodiment of the disclosure is suitable for a permanent magnet auxiliary type synchronous reluctance starter/generator, and the permanent magnet auxiliary type synchronous reluctance starter/generator can be connected to an aviation high-voltage direct-current power supply system. In addition, the power converter provided by the embodiment of the disclosure can realize the starting and power generation functions of the permanent magnet auxiliary type synchronous reluctance motor by only adopting one set of power devices, and has the advantages of high power density, high efficiency, good dynamic and static performances of a power system and the like.

The embodiment of the disclosure provides a power converter control method, which is used for controlling a power converter with a three-phase full-bridge circuit. For example, the method may be used to control the power converter in any of the above embodiments, and the method may be implemented in the main control chip of the power converter control circuit provided in any of the above embodiments. The method comprises the following steps:

converting the phase current of the starting/generating machine into d and q axis currents of the starting/generating machine through coordinate system conversion;

performing PI calculation on the difference values of the d-axis current and the q-axis current and the d-axis current inner loop command to obtain d-axis voltage commands and q-axis voltage commands;

converting the d-axis voltage command and the q-axis voltage command into an alpha-axis voltage command and a beta-axis voltage command through coordinate system conversion;

the alpha and beta axis voltage commands are modulated into control signals for a three-phase full bridge circuit in the power converter through SVPWM modulation, and the three-phase full bridge circuit of the power converter is connected with a starter/generator.

In this embodiment, the connection manner of the power converter and the starter/generator is the same as or similar to that of the above embodiment, and is not described herein again.

Fig. 3 shows a current inner loop control block diagram of a permanent magnet assisted synchronous reluctance starter/generator. As shown in fig. 3, the leftmost sideFor a stator current instruction of the starting/generating machine, the current instruction can obtain d and q axis current inner ring instructions of the starting/generating machine after being distributed by a current distribution strategyAndwherein the current allocation strategy may be determined based on:

for example, the electromagnetic torque of the starter/generator is T_eAnd satisfies the following conditions:

wherein p is the pole pair number of the starter/generator, psi_fFor starting/generating the permanent magnet flux linkage, L_dAnd L_qThe d and q axis inductances, i, of the starter/generator respectively_dAnd i_qThe d-axis current and the q-axis current of the starting/generating machine are respectively. And if the same direction of the torque and the rotating speed of the starting/power generator is positive and the reverse direction is negative, the starting/power generator drags the engine to start in the starting stage, the electromagnetic torque is positive, the starting/power generator outputs energy outwards in the power generation stage, the electromagnetic torque is braking property, and the electromagnetic torque is negative. It can be seen that the electromagnetic torque control of the starter/generator is bidirectional. In addition, when the load is suddenly unloaded in the voltage stabilization power generation stage, the direct current bus voltage pump rises to exceed the preset voltage (for example, to exceed 270V), and the electromagnetic torque of the starter/generator can be controlled to be temporarily larger than 0, so that the starter/generator absorbs the energy of the direct current bus capacitor, and the voltage overshoot is quickly suppressed and the voltage is stabilized to the preset voltage. Thus, there is a problem of bi-directional control of the electromagnetic torque both in steady state and in transient state of the starter/generator. According to rising/risingElectromagnetic torque T of motor_eThe direction of the electromagnetic torque may be controlled by controlling the direction of the q-axis current. Meanwhile, in order to ensure the permanent magnet torque and the reluctance torque of the generator/starter to be consistent in direction, psi is ensured_fAnd (L)_d-L_q)i_dThe symbols are the same. Due to (L)_d-L_q)<0, therefore, i must be controlled_d<0。

In summary, the d-axis and q-axis current distribution strategies can satisfy:

in the formula, θ is a current vector angle preset by the current distribution strategy, and is an angle included by a current vector and a q axis, and the angle can be selected as a current vector angle controlled by adopting a maximum torque current ratio under a rated load.

The a and b phase current i of the generator/generator can be acquired by a phase current sensor in the power converter_aAnd i_bAs shown in FIG. 3, the phase a and phase b currents i of the generator/starter can be converted by coordinate system transformation_aAnd i_bConverted into d and q axis currents i of the starter/generator_dAnd i_q. For example, the a and b phase currents i of the generator/starter can be adjusted_aAnd i_bPerforming Clarke and Park conversion to obtain d and q axis currents i of the generator/generator_dAnd i_q. Then, an inner loop command of d-axis and q-axis currents is obtainedAndand d, q axis currents i_dAnd i_qThen inputting the obtained difference value into d-axis and q-axis PI controllers, and obtaining d-axis and q-axis voltage commands U to be applied after PI calculation_dAnd U_q. Example (b)E.g., the d-axis current can be commanded to the inner loopAnd d-axis current i_dSubtracting to obtain d-axis current difference value, and carrying out inner loop instruction on q-axis currentAnd q-axis current i_qObtaining a q-axis current difference value by subtraction, inputting the two difference values into a d-axis PI controller and a q-axis PI controller, and obtaining a d-axis voltage instruction U and a q-axis voltage instruction U to be applied after PI calculation_dAnd U_q. For d and q axis voltage command U_dAnd U_qThe voltage command U of the alpha and beta axes of the starter/generator can be obtained by transforming the coordinate system_αAnd U_β. For example, the d and q axis voltage commands U can be applied_dAnd U_qCarrying out inverse Park conversion to obtain voltage commands U of alpha and beta axes of the starter/generator_αAnd U_β. By commanding U to voltage_αAnd U_βAfter SVPWM modulation, voltage command U of alpha and beta axes can be given_αAnd U_βModulated as a control signal S to a three-phase full bridge circuit₁Thereby enabling the driving circuit in the power converter to be driven according to the control signal S₁And controlling the power device of the three-phase full-bridge circuit, thereby realizing the control of the starter/generator through the three-phase full-bridge circuit. The starting/generating machine rotor position information is usually needed when Clarke, Park conversion and inverse Park conversion are carried out, and the starting/generating machine rotor position information can be transmitted to a rotary transformer decoding circuit of a control circuit in a power supply converter through a rotary transformer on a starting/generating machine and is obtained by decoding through the rotary transformer decoding circuit. After SVPWM modulation is completed in a main control chip of a control circuit in the power converter, PWM signals output by the main control chip can be sent to a driving circuit in the power converter through a PWM circuit, and then the power device of a three-phase full-bridge circuit in the power converter can be driven to be switched on and switched off through the isolation amplification effect of the driving circuit.

FIG. 4 illustrates a permanent magnet assisted synchronous reluctance start/generator start mode control architecture. Starting control of starter/generators, i.e. by controlling starter/generatorsThe electromagnetic torque is generated to drag the engine to accelerate to the ignition rotating speed, so that the engine is started. The starting process of a starter/generator is generally divided into a constant torque start and a constant power start. When the starting/generating speed is 0 to omega_sStarting with constant torque, starting at omega_sStarting with constant power until the ignition rotating speed. Wherein, ω is_sTo switch the rotational speed. When the engine starts to start, the rotation speed of the starter/generator is 0 (omega)_r0), the switching signal ss is 0, at which time the multiplexer can be controlled to gate a constant stator current valueAs starter/generator stator current command Is starting torque T under a preset current vector angle_eCorresponding stator current amplitude, andthe constant value can control the starter/generator to generate constant torque to drive the engine to start, so that the rotation speed of the starter/generator and the engine gradually rises. When starting/generating speed omega_rExceeding the switching speed omega_sWhen the switching signal ss is equal to 1, the double-multiplexer gating power closed-loop calculation value can be controlled to be used as a starter/generator stator current commandThe power closed loop calculation value can be obtained by calculating a difference value between an active power command P and an actual power P, and then inputting the difference value into the power loop PI for calculation. The actual power P can be obtained by d-axis and q-axis voltages U_dAnd U_qAnd d, q-axis currents i_dAnd i_qAnd (4) calculating. For example, the actual power P may satisfy:

at the same time, i.e. when the generator speed ω is above_rExceeding the switching speed omega_sWhen the power loop is switched, the rising edge signal of the switching signal ss triggers the power instruction P and the power loop PI integral initial value I₀Set to ensure a smooth transition from constant torque start to constant power start. Setting the power instruction P as the active power P at the constant torque starting end time, and setting the integral initial value I of the power loop PI₀Is arranged as

During the constant power start phase, the starter/generator pulls the engine to further increase the engine speed. After the engine reaches the ignition rotating speed, the engine is ignited to start and starts to accelerate by means of self output torque, and the starting stage is finished. Since the starter/generator is not required to generate electromagnetic torque after the engine is started, after the engine speed is detected to reach the ignition speed, the power distribution system can send a command to control the direct-current side direct-current power supply contactor KM2 to be disconnected and enable the power converter to close all PWM waves, namely close the three-phase full bridge circuit.

In this embodiment, after controlling the multiplexer to gate the constant stator current value as the starter/generator stator current command, or controlling the multiplexer to gate the power closed loop calculation value as the starter/generator stator current command, the d-axis and q-axis current commands of the starter/generator under the working condition may be obtained based on the current distribution strategy, and then the control signal to the three-phase full-bridge circuit in the power converter may be generated based on the power converter control method, so as to control the starter/generator through the three-phase full-bridge circuit, thereby enabling the starter/generator to drive the engine to start.

As shown in fig. 2, in the starting/generator starting operation phase, the power distribution system may first control the contactors KM3 and KM1 to be turned off, and KM2 to be turned on, so that the dc side of the power converter is connected to the starting power supply through the current-limiting resistor, and the dc side support capacitor of the power converter may be gradually charged to a preset voltage (e.g., to 270V) after being limited by the resistor. When the voltage of the capacitor at the direct current side is stabilized to the preset voltage, the power distribution system can control the KM3 to be switched on, so that the direct current side of the power converter is directly connected with a starting power supply, and sends a signal to the control circuit of the power converter to control the three-phase power tube of the power converter to switch, so that the starting/generating machine generates starting torque. The starting torque is mainly reluctance torque and is assisted by electromagnetic torque. Under the action of the starting torque, the starter/generator accelerates against the braking torque and drives the engine, which is coaxially connected with the starter/generator, to accelerate. After the engine accelerates to the ignition speed, the engine is started and starts to provide acceleration torque, at the moment, the motor is not required to provide the acceleration torque any more, so that the power distribution system can send a command to close the three-phase full-bridge power tube, the current and the torque of the motor are both reduced to 0, and the KM2 is disconnected. The cranking phase continues until the engine is ramped up to the firing speed. During the start-up phase, the system power flow is from the electrical energy of the starting power source to the mechanical energy of the engine.

FIG. 5 shows a flow chart of a permanent magnet assisted synchronous reluctance start/generator voltage build-up mode control method. The pressure build-up mode control means: after the engine is started, when the starting/generating set is reversely accelerated to the voltage-building rotating speed by the engine, the power converter controls the voltage of the direct current bus to rise and stabilize to a preset voltage (for example, the preset voltage is 270V). After the engine is started, the starter/generator is in an uncontrolled state, and in order to smoothly switch the starter/generator from the uncontrolled state to a voltage-stabilizing power generation control state, namely, the starter/generator is switched from a state of being controlled by a three-phase full bridge circuit to a voltage-stabilizing power generation state, the voltage-building mode control method of the starter/generator can be carried out in three steps, and a switching instruction (or also called as a control instruction) of each step can be judged by an upper computer according to the rotating speed of the starter/generator, the phase current of the starter/generator and the voltage of a direct-current bus and then sent to a control circuit of a power converter. For example, when the rotation speed of the generator/generator reaches a preset rotation speed, the phase current of the generator/generator is stabilized at a current preset value or a current preset range, and the voltage of the direct current bus is stabilized at a voltage preset value or a voltage preset range, the upper computer may send a control instruction to the control circuit of the power converter. In practical application, under different working conditions, the preset rotating speed, the preset current value or the preset current range, and the preset voltage value or the preset voltage range are different, and specific numerical values of the preset rotating speed, the preset current value or the preset current range and the preset voltage range can be adjusted by technicians according to actual conditions. :

the method comprises the following steps that firstly, based on a first control instruction sent by an upper computer, a starting/power generator is switched from an uncontrolled state to a current inner loop closed-loop control state. Wherein the first control instruction is configured to control the starter/generator to switch from the uncontrolled state to the current inner loop closed-loop control state. Illustratively, in an uncontrolled state before switching, all the PWM signals output by the control circuit are low level, i.e. the fully controlled bridge circuit is turned off; starting/generating machine stator current instruction after switching to current inner loop closed-loop control stateKeeping to 0A, so as to obtain the distributed d and q axis current inner loop commandAndalso, after holding the voltage at 0A, according to the power converter control method, a control signal (PWM signal) to the three-phase full bridge circuit in the power converter is generated, and the three-phase full bridge circuit power transistor of the power converter is operated to control the starter/generator so that the starter/generator phase current is controlled to 0A.

When the starting/generating machine is switched from an uncontrolled state to the current inner loop closed-loop control, an integrator of the current inner loop PI controller needs to be set with an initial value so as to prevent the current and voltage fluctuation of a motor system caused by the mismatching of a PWM applied voltage vector and a no-load back electromotive force voltage vector. d. Initial value I of q-axis PI integrator₀Can satisfy the following conditions:

I_0d＝ω_elec(L_di_d+ψ_f)＝ω_elecψ_f

I_0q＝ω_elecL_qi_q＝0V

in the formula I_0d、I_0qFor d and q axis PI integrationStarting value, ω_elecIs the electrical angular velocity of the starter/generator. After the control is switched to the current inner loop closed-loop control, the voltage value of the direct current side at the moment is slightly reduced compared with the voltage value in the uncontrolled state due to the PWM chopping loss, but the voltage can be kept stable.

And secondly, switching the starting/power generator from the current inner ring closed-loop control state to the voltage outer ring closed-loop control state based on a second control instruction sent by the upper computer. Wherein the second control instruction is configured to control the starter/generator to switch from the current inner loop closed-loop control state to the voltage outer loop closed-loop control state. Illustratively, the d-axis and q-axis current inner loop commands are started from the step of switching to the voltage outer loop closed loop control stateAndthe current is not kept to be 0 any more, and a voltage loop PI calculation is firstly carried out to obtain a stator current instructionThen obtaining d and q axis current inner ring instructions after current distribution strategy distributionAndin order to avoid the system overshoot caused by the voltage loop command being too much larger than the actual voltage, when the voltage loop command is switched to the voltage outer loop closed-loop control, the first direct current bus voltage command may be the direct current bus voltage value in the current inner loop closed-loop control state plus a preset value. For example, 10V may be added. In this step, a stator current instruction can be obtained by performing voltage loop PI calculation based on the difference between the first dc bus voltage instruction and the real-time feedback voltage of the dc busWherein, the real-time feedback voltage of the DC bus can be converted by the power supplyAnd a direct current bus voltage sensor in the device acquires the voltage.

And thirdly, based on a third control command sent by the upper computer, maintaining the voltage outer ring control state of the starting/power generator, and increasing the voltage command of the first direct current bus to a preset voltage in a sloping land, such as 270V. Wherein the third control instruction is configured to cause the starter/generator to maintain the voltage outer loop control state. Compared with a step command, the ramp voltage command can effectively avoid the problems of overlarge transient current and voltage overshoot of a direct current side. Up to this point, the power supply system has smoothly transitioned from the uncontrolled state to the regulated control state.

As shown in fig. 2, after the power distribution system detects that the speed of the engine anti-lift/generator is increased to the voltage-building rotation speed, the KM3 can be controlled to be closed, and the KM1 and the KM2 are switched off, at this time, the upper computer can send a control instruction to a control circuit of the power converter to generate a stator current instruction of the power/generator, so that the control circuit generates a control signal for a three-phase full-bridge circuit of the power converter, and the power converter drives the power/generator to perform voltage-building mode control. The power converter controls the starter/generator to inject current into the direct-current side capacitor through the switching action of the three-phase power tube, so that the voltage of the direct-current side capacitor gradually rises to a preset voltage. When the power converter comprises a supporting capacitor or a filter capacitor, the direct current side capacitor at the moment comprises the supporting capacitor or the filter capacitor; when the power converter comprises a support capacitor and a filter capacitor, the direct current side capacitor at this time comprises the support capacitor and the filter capacitor.

Fig. 6 shows a schematic diagram of a permanent magnet assisted synchronous reluctance start/generator regulated power generation mode control architecture. In the voltage-stabilizing power generation stage of the starting/generating set, because the voltage of the direct current bus is required to be stabilized at a preset voltage (for example, 270V), the outer loop of the control needs to adopt voltage closed-loop control. A control method of voltage PI closed-loop control plus current feed-forward may be employed. For example, the preset voltage value may be used as the second dc bus voltage command, and the real-time dc bus voltage may be used as the feedback to obtain the calculated value of the voltage loop PI. For example, a preset dc bus voltage command (e.g., a preset voltage of 270V) and a sampled real-time dc bus voltage U may be calculated_dcVoltage betweenAnd (4) calculating the difference value of the voltage obtained by calculation by inputting the voltage difference value into a voltage PI closed-loop controller, and obtaining a PI calculated value after amplitude limiting. Then, a direct current bus current feedforward command can be obtained according to the direct current bus current. For example, the DC bus current i can be obtained according to sampling_dcCalculating a DC bus current feedforward instructionThen, a starter/generator stator current command can be obtained from the obtained voltage loop PI calculation value and the dc bus current feedforward command. For example, the voltage loop PI calculated value and the DC bus current feedforward command may be calculatedAdding and taking the opposite number to obtain the starting/generator stator current instruction of voltage-stabilizing power generation controlThen, according to the above power converter control method, a starter/generator stator current command is issuedD-axis and q-axis current inner ring commands can be obtained after current distribution strategy distributionAndand d-axis and q-axis currents of the starter/generator can be controlled according to a current closed-loop control method. And finally, PWM waves for controlling the three-phase full-bridge circuit of the power converter can be generated to control the three-phase full-bridge circuit so as to realize the voltage-stabilizing power generation operation of the starter/generator. The purpose of taking the negative number is to ensure that the electromagnetic torque is negative during power generation and the energy flow is from the motor to the load. The voltage ring PI amplitude limiting method can adopt a clipping integral anti-saturation mode to inhibit the voltage overshoot of the direct current bus in the transient state. Since the purpose of PI control is mainly to eliminate the static difference of DC bus voltage by integral action, PI controlSetting k of the device_pThe parameters and the clipping amplitude limiting value can be selected to be smaller parameters, so that the stability of voltage control is ensured, and the voltage overshoot is restrained. When the load is suddenly added or removed, the dynamic performance of the voltage-stabilizing power generation mode control is mainly provided by the current feedforward of the direct current bus. The direct current bus current feedforward directly obtains the required current feedforward instruction by detecting the direct current bus current, and the dynamic performance is superior to that of independent voltage outer loop control.

By direct bus current i_dcObtaining a direct current bus current feedforward instructionThe method comprises two methods, one method is to prepare a table through experiments and obtain the table through a table look-up method; another method is formulaic calculation. Wherein, need to know comparatively accurate motor parameter when calculating through the formula. For example, when a formula calculation method is adopted, a direct current bus current feedforward instructionThe following equation can be satisfied:

as shown in fig. 2, when the starter/generator enters a voltage-stabilized power generation operation stage, the power distribution system controls KM1 and KM3 to be closed, and KM2 to be open, so that the power supply system is connected with the power distribution system. When the electric equipment is connected to the power distribution system, the electric equipment absorbs energy from the direct-current bus capacitor of the power converter, the voltage of the direct-current bus capacitor drops, the power converter detects the voltage drop and correspondingly improves the injection power of the starter/generator to the direct-current bus capacitor, and the voltage of the support capacitor and the voltage of the filter capacitor are restored to the preset voltage (for example, the preset voltage is 270V). The output power of the starter/generator is realized by controlling the current of the starter/generator to generate braking torque in the process. The braking torque is mainly reluctance torque and is assisted by electromagnetic torque, but the direction of the braking torque is opposite to the direction of the torque in the starting operation stage. In the voltage-stabilizing power generation stage, the system energy flow is electric energy from the mechanical energy of the engine to the electric equipment.

The control method of the power converter provided by the embodiment can be divided into three control modes, namely, starting mode control, voltage-building mode control and voltage-stabilizing power generation mode control. The inner-loop control methods of the three control modes are d-axis and q-axis current closed-loop control after stator current instruction distribution. The three control modes are different in the generation method of the stator current command: when in constant torque starting mode, the stator current command is determined by the required torque; when the motor is in a constant-power starting mode, a stator current instruction is obtained by outer ring power closed-loop calculation; when the motor is in a voltage build-up mode, the stator current instruction is obtained by closed-loop calculation according to a 0 current instruction and an outer ring voltage respectively; when the generator is in a voltage stabilization generating mode, the stator current instruction is obtained by adding a direct current bus current feedforward value to an outer ring voltage closed-loop calculated value.

Based on the power converter control method provided by the embodiment, the starting and power generation functions of the starter/generator can be realized only by adopting one set of power devices, and the method is suitable for the permanent magnet auxiliary type synchronous reluctance starter/generator, can enable the permanent magnet auxiliary type synchronous reluctance starter/generator to be suitable for an aviation high-voltage direct-current starter/generator source system, and has the advantages of high power density, high efficiency, good dynamic and static performances of a power supply system and the like.

The disclosed embodiment also provides a power converter control device, which includes:

a first transformation module configured to transform the starter/generator phase current into d, q-axis currents of the starter/generator by coordinate system transformation;

the second transformation module is configured to distribute the stator current instruction of the starting/generating machine to a d-q coordinate system through a current distribution strategy to obtain d and q axis current inner loop instructions of the starting/generating machine;

the first calculation module is configured to perform PI calculation on the difference values of the d-axis current and the q-axis current and the d-axis current inner loop instruction and the q-axis current inner loop instruction to obtain d-axis voltage instructions and q-axis voltage instructions;

a third transformation module configured to transform the d and q axis voltage commands into α and β axis voltage commands by coordinate system transformation;

and the signal generation module is configured to modulate the alpha and beta axis voltage commands into control signals for a three-phase full bridge circuit in the power converter through SVPWM (space vector pulse width modulation), wherein the three-phase full bridge circuit is connected with a starter/generator.

It should be noted that, when the power converter control device provided in the above embodiment is used to control a power converter with a three-phase full-bridge circuit, the division of the above functional modules is merely exemplified, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure or program of the device may be divided into different functional modules to complete all or part of the above described functions. In addition, the power converter control device and the power converter control method provided by the above embodiments belong to the same concept, and specific implementation processes thereof are detailed in the method embodiments and are not described herein again.

Based on the power converter control device provided by the embodiment, the starting and power generation functions of the starter/generator can be realized only by adopting one set of power devices, and the power converter control device is suitable for a permanent magnet auxiliary type synchronous reluctance starter/generator, can enable the permanent magnet auxiliary type synchronous reluctance starter/generator to be suitable for an aviation high-voltage direct-current starter/generator source system, and has the advantages of high power density, high efficiency, good dynamic and static performances of a power supply system and the like.

The embodiments of the present disclosure also provide a computer-readable storage medium, in which computer program instructions are stored, and when the computer program instructions are executed by a processor of a user equipment, the user equipment is caused to execute the method disclosed in any of the above embodiments.

Computer-readable storage media provided by any embodiment of the present disclosure include permanent and non-permanent, removable and non-removable media, and information storage may be implemented by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

The embodiment of the present disclosure further provides an electronic device, which includes a processor and a memory, where the memory stores computer program instructions suitable for the processor to execute, and the computer program instructions are executed by the processor to perform the method disclosed in any of the above embodiments.

The electronic device provided by any embodiment of the present disclosure may be a mobile phone, a computer, a tablet computer, a server, a network device, or may also be a usb disk, a removable hard disk, a Read Only Memory (ROM), a magnetic disk, or an optical disk.

For example, the electronic device may include: a processor, a memory, an input/output interface, a communication interface, and a bus. Wherein the processor, the memory, the input/output interface and the communication interface are communicatively connected to each other within the device by a bus.

The processor may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits, and is configured to execute a relevant program to implement the technical solutions provided in the embodiments of the present specification.

The Memory may be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, or the like. The memory may store an operating system and other application programs, and when the technical solution provided by the embodiments of the present specification is implemented by software or firmware, the relevant program codes are stored in the memory and called by the processor to be executed.

The input/output interface is used for connecting the input/output module to realize information input and output. The input/output/modules may be configured in the device as components or may be external to the device to provide corresponding functionality. The input devices may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output devices may include a display, a speaker, a vibrator, an indicator light, etc.

The communication interface is used for connecting the communication module so as to realize the communication interaction between the equipment and other equipment. The communication module can realize communication in a wired mode (such as USB, network cable and the like) and also can realize communication in a wireless mode (such as mobile network, WIFI, Bluetooth and the like).

A bus includes a path that transfers information between the various components of the device, such as the processor, memory, input/output interfaces, and communication interfaces.

It should be noted that although the above-described device shows only a processor, a memory, an input/output interface, a communication interface and a bus, in a specific implementation, the device may also include other components necessary for normal operation. In addition, those skilled in the art will appreciate that the above-described apparatus may also include only the components necessary to implement the embodiments of the present description, and not necessarily all of the described components.

From the above description of the embodiments, it is clear to those skilled in the art that the embodiments of the present disclosure can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the embodiments of the present specification may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments of the present specification.

The systems, methods, modules or units described in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. A typical implementation device is a computer, which may take the form of a personal computer, laptop computer, cellular telephone, camera phone, smart phone, personal digital assistant, media player, navigation device, email messaging device, game console, tablet computer, wearable device, or a combination of any of these devices.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The above-described method embodiments are merely illustrative, wherein the modules described as separate components may or may not be physically separate, and the functions of the modules may be implemented in one or more software and/or hardware when implementing the embodiments of the present specification. And part or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

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