阅读说明：本技术 一种基于变频器分时复用的电气传动系统 (Electric transmission system based on time-sharing multiplexing of frequency converter ) 是由 李哲然 谢坤 刘峰 王璐 杨军 于 2020-05-25 设计创作，主要内容包括：本发明公开了一种基于变频器分时复用的电气传动系统,属于电气传动领域,包括：若干台通用公共变频器、开关阵列、若干台辅机电动机及综合管理监控装置；各通用公共变频器与开关阵列连接；开关阵列与各辅机电动机连接；综合管理监控装置与通用公共变频器及开关阵列连接；综合管理监控装置,用于在某台目标辅机电动机需要使用时,选择空闲的目标通用公共变频器,并接通开关阵列中与目标通用公共变频器及目标辅机电动机连通的线路,加载与目标辅机电动机对应的控制参数,由控制参数控制目标通用公共变频器驱动目标辅机电动机运转。通过本发明大幅降低了设备配置数量,在减少设备数量的同时增大了系统的运行可靠性,能够提高电气传动系统的集成度。(The invention discloses an electric transmission system based on frequency converter time-sharing multiplexing, belonging to the field of electric transmission and comprising: a plurality of common frequency converters, a switch array, a plurality of auxiliary machine motors and a comprehensive management monitoring device; each common frequency converter is connected with the switch array; the switch array is connected with each auxiliary engine motor; the comprehensive management monitoring device is connected with the common public frequency converter and the switch array; and the comprehensive management monitoring device is used for selecting an idle target universal common frequency converter when a certain target auxiliary machine motor needs to be used, switching on a circuit communicated with the target universal common frequency converter and the target auxiliary machine motor in the switch array, loading control parameters corresponding to the target auxiliary machine motor, and controlling the target universal common frequency converter to drive the target auxiliary machine motor to operate by the control parameters. The invention greatly reduces the configuration quantity of equipment, increases the running reliability of the system while reducing the quantity of the equipment, and can improve the integration level of the electric transmission system.)

1. An electric drive system based on frequency converter time division multiplexing, comprising: a plurality of common frequency converters, a switch array, a plurality of auxiliary machine motors and a comprehensive management monitoring device;

the output end of each common frequency converter is connected with the input end of the switch array; the output end of the switch array is connected with each auxiliary motor; the comprehensive management monitoring device is connected with each common public frequency converter and the switch array;

the comprehensive management monitoring device is used for selecting a target universal common frequency converter in an idle state when a certain target auxiliary machine motor needs to be used, connecting a line in the switch array, which is communicated with the target universal common frequency converter and the target auxiliary machine motor, loading control parameters corresponding to the target auxiliary machine motor, and controlling the target universal common frequency converter to drive the target auxiliary machine motor to operate by the control parameters.

2. The system of claim 1, wherein the switch array comprises a plurality of controllable switches and a switch array control unit;

each common frequency converter is connected with each auxiliary motor through the controllable switch, wherein one controllable switch is used for connecting one common frequency converter with one auxiliary motor;

and the switch array control unit is used for communicating with the comprehensive management monitoring device to control the corresponding controllable switch to act and switch on a circuit which is communicated with the target universal common frequency converter and the target auxiliary machine motor in the switch array.

3. The system according to claim 1 or 2, wherein the integrated management monitoring device is specifically configured to select the target universal common frequency converter and send a control parameter of the target auxiliary machine motor to the target universal common frequency converter according to a task to be executed and a current system operating condition, and simultaneously select an appropriate switch array conduction path and send a conduction instruction to the switch array control unit, so that the switch array control unit controls conduction of a controllable switch connected between the target universal common frequency converter and the target auxiliary machine motor according to the conduction instruction to gate the conduction path of the switch array.

4. The system according to claim 3, wherein the integrated management monitoring device is further configured to send a shutdown instruction to the target universal common frequency converter when an operation condition changes and needs to shut down the target auxiliary machine motor, start another target auxiliary machine motor, send a new turn-on instruction to the switch array control unit after the shutdown is completed, so that the switch array control unit controls a controllable switch connected between the target universal common frequency converter and the another target auxiliary machine motor to be turned on according to the new turn-on instruction, and load control parameters of the another target auxiliary machine motor into the target universal common frequency converter for execution, so as to implement time division multiplexing of the universal common frequency converter.

5. The system according to claim 4, wherein the integrated management monitoring device is further configured to, when the target universal common frequency converter fails, enable a universal common frequency converter in an idle state in the remaining universal common frequency converters to replace the target universal common frequency converter, so as to achieve a backup effect.

6. The system of claim 1, wherein the common frequency converter comprises: the device comprises a control circuit, a communication circuit, a bus voltage detection circuit, a phase current detection circuit, a signal conditioning circuit, an analog-to-digital conversion circuit and a module power main circuit;

the control parameters sent by the comprehensive management monitoring device are loaded by the control circuit after being processed by the communication circuit, the control circuit sends SVPWM control signals to control the module power main circuit according to current feedback signals, and then the auxiliary machine motor is controlled to run, wherein the current feedback signals are formed by actual three-phase currents through the phase current detection circuit, the signal conditioning circuit and the analog-to-digital conversion circuit and are used for realizing the control of the rotating speed and the power of the motor, and the control parameters of the module power main circuit are adjusted according to the grid voltage value detected by the bus voltage detection circuit.

7. The system of claim 1, wherein the auxiliary motor is a three-phase ac motor that drives a fan, water pump, and other auxiliary machinery through an output shaft.

Technical Field

The invention belongs to the field of electric transmission, and particularly relates to an electric transmission system based on frequency converter time division multiplexing.

Background

With the development of electric transmission technology of ships, a transmission device based on motor drive is gradually replacing traditional pneumatic and hydraulic transmission devices, and a large number of electric transmission auxiliary equipment such as fans, water pumps, electric rudder devices and the like with different functions are widely applied to modern ships. In order to realize energy saving and noise reduction, a frequency converter is generally required to be configured for the transmission driven by the motor one to one so as to realize the rotation speed adjustment or the accurate motion control of the transmission.

The auxiliary machinery equipment of boats and ships often uses the operating mode different, if some water pumps only are used for low-speed navigation operating mode, some fans only open when cabin temperature is too high. In addition, in order to improve the system operation reliability, a one-use-one-standby redundancy scheme is generally required for the auxiliary motor and the frequency converter thereof. The characteristics of the configuration of the marine auxiliary engine lead to lower use coefficient of the frequency converter of the whole marine auxiliary engine, and a large number of special frequency converters are in an idle working state, so that the overall resource utilization rate of the marine is low, the universality is poor, and the design integration level is low.

Disclosure of Invention

Aiming at the defects or improvement requirements of the prior art, the invention provides an electric transmission system based on frequency converter time division multiplexing, so that the technical problems that a large number of special frequency converters configured in the current electric transmission system of a ship are low in use coefficient, long-term idle working state and low in design integration level of the electric transmission system of the ship are solved.

In order to achieve the above object, the present invention provides an electric transmission system based on frequency converter time division multiplexing, comprising: a plurality of common frequency converters, a switch array, a plurality of auxiliary machine motors and a comprehensive management monitoring device;

the output end of each common frequency converter is connected with the input end of the switch array; the output end of the switch array is connected with each auxiliary motor; the comprehensive management monitoring device is connected with each common public frequency converter and the switch array;

the comprehensive management monitoring device is used for selecting a target universal common frequency converter in an idle state when a certain target auxiliary machine motor needs to be used, connecting a line in the switch array, which is communicated with the target universal common frequency converter and the target auxiliary machine motor, loading control parameters corresponding to the target auxiliary machine motor, and controlling the target universal common frequency converter to drive the target auxiliary machine motor to operate by the control parameters.

Preferably, the switch array comprises a plurality of controllable switches and a switch array control unit;

each common frequency converter is connected with each auxiliary motor through the controllable switch, wherein one controllable switch is used for connecting one common frequency converter with one auxiliary motor;

and the switch array control unit is used for communicating with the comprehensive management monitoring device to control the corresponding controllable switch to act and switch on a circuit which is communicated with the target universal common frequency converter and the target auxiliary machine motor in the switch array.

Preferably, the integrated management monitoring device is specifically configured to select the target universal common frequency converter and send the control parameter of the target auxiliary machine motor to the target universal common frequency converter according to a task to be executed and a current system operating condition, and simultaneously select a suitable switch array conduction path and send a conduction instruction to the switch array control unit, so that the switch array control unit controls conduction of a controllable switch connected between the target universal common frequency converter and the target auxiliary machine motor according to the conduction instruction, and gates the conduction path of the switch array.

Preferably, the integrated management monitoring device is further configured to send a shutdown instruction to the target general common frequency converter when an operation condition changes and the target auxiliary machine motor needs to be shut down, and start another target auxiliary machine motor, and after shutdown is completed, send a new conduction instruction to the switch array control unit, so that the switch array control unit controls a controllable switch connected between the target general common frequency converter and the another target auxiliary machine motor to be turned on according to the new conduction instruction, and loads a control parameter of the another target auxiliary machine motor into the target general common frequency converter for execution, thereby implementing time division multiplexing of the general common frequency converter.

Preferably, the integrated management monitoring device is further configured to, when the target common frequency converter fails, start a common frequency converter in an idle state in the remaining common frequency converters to replace the target common frequency converter, so as to achieve a backup effect.

Preferably, the common frequency converter includes: the device comprises a control circuit, a communication circuit, a bus voltage detection circuit, a phase current detection circuit, a signal conditioning circuit, an analog-to-digital conversion circuit and a module power main circuit;

the control parameters sent by the comprehensive management monitoring device are loaded by the control circuit after being processed by the communication circuit, the control circuit sends SVPWM control signals to control the module power main circuit according to current feedback signals, and then the auxiliary machine motor is controlled to run, wherein the current feedback signals are formed by actual three-phase currents through the phase current detection circuit, the signal conditioning circuit and the analog-to-digital conversion circuit and are used for realizing the control of the rotating speed and the power of the motor, and the control parameters of the module power main circuit are adjusted according to the grid voltage value detected by the bus voltage detection circuit.

Preferably, the auxiliary machine motor is a three-phase alternating-current motor, and drives a fan, a water pump and other auxiliary machinery through an output shaft.

In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:

(1) the universal common frequency converter is used for replacing a special frequency converter of an auxiliary engine motor of a traditional electric transmission system, so that the utilization rate of equipment is improved; (2) the hardware functions of the common frequency converters are the same and can be mutually backed up, so that the universality and the operation reliability of the system are improved; (3) the comprehensive management monitoring device is used for carrying out centralized management on the whole system, and can carry out online configuration on the control program and the control parameter of the auxiliary motor, thereby greatly improving the intelligent level of the system.

Drawings

FIG. 1 is a schematic structural diagram of an electric drive system based on frequency converter time-sharing multiplexing according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a switch array according to an embodiment of the present invention;

fig. 3 is a control schematic diagram of a common frequency converter according to an embodiment of the present invention;

wherein, 1 is a common frequency converter, 2 is a switch array, 3 is a comprehensive management monitoring device, and 4 is an auxiliary motor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The invention designs an electric transmission system based on frequency converter time division multiplexing, and adopts a common frequency converter and a switch array to drive auxiliary motors of different types, thereby greatly reducing the number of frequency converters, improving the overall resource utilization rate and equipment universality and ensuring higher system integration level. The method is widely applicable to electric transmission systems.

Fig. 1 is a schematic structural diagram of an electric drive system based on frequency converter time division multiplexing according to an embodiment of the present invention, and the numbers of the common frequency converter 1 and the auxiliary motors 4 in fig. 1 are not to be construed as the only limitation to the present invention, and other numbers of common frequency converters and auxiliary motors may also be used.

Aiming at the characteristics of multiple types of ship electric transmission auxiliary equipment, different auxiliary machines with different use working conditions and high backup redundancy safety requirement, the invention adopts the thinking of 'hardware time-sharing multiplexing and software configuration as required', and configures a plurality of common frequency converters 1, the output end of each common frequency converter 1 is connected with the input end of a switch array 2, the output end of the switch array 2 is connected with each auxiliary machine motor 4, and a comprehensive management monitoring device 3 is connected with each common frequency converter 1 and the switch array 2;

the comprehensive management monitoring device 3 is used for selecting a target universal common frequency converter in an idle state when a certain target auxiliary machine motor needs to be used, switching on a circuit communicated with the target universal common frequency converter and the target auxiliary machine motor in a switch array, loading a control parameter corresponding to the target auxiliary machine motor, and controlling the target universal common frequency converter to drive the target auxiliary machine motor to operate by the control parameter.

In the embodiment of the invention, the universal common frequency converter comprises a driving module and a control module, wherein the driving module adopts a direct current input filter circuit and a three-phase bridge circuit composed of IGBT power electronic power devices as a main loop, and converts electric energy supplied by a direct current power grid into alternating current electric energy required by the running of a motor. The control module adopts chips such as a DSP or an ARM as a main control chip, obtains real-time state feedback of motor stator current through the Hall current sensor, and sends out a control instruction signal through the I/O interface to control the on and off of the IGBT power electronic power device. The DSP or ARM control software in the control module adopts a modular design scheme, control programs of common alternating current motors such as induction motors, permanent magnet motors and the like are prestored, and parameters related to the operation characteristics of the auxiliary machine in the DSP or ARM control programs can be dynamically configured by the comprehensive management monitoring device in a network communication mode.

In the embodiment of the invention, the switch array comprises a plurality of controllable switches, a plurality of busbars and a switch array control unit, the controllable switches and the busbars are connected to form a power distribution network, the connection of a plurality of universal common frequency converters and a plurality of auxiliary motors is realized, and the connection combination of the plurality of universal common frequency converters and the plurality of auxiliary motors can be realized through the on-off combination mode of different controllable switches. The contact signals of each controllable switch are controlled by a switch array control unit, the switch array control unit can be in network communication with the comprehensive management monitoring device to obtain the currently required running equipment combination, one controllable switch is used for connecting one common frequency converter and one auxiliary machine motor, the number of the controllable switches can be determined according to the requirement, and the number of the busbars is the same as that of the common frequency converters.

In the embodiment of the present invention, the switch array control unit may be a PLC control unit or other control components, and the embodiment of the present invention is not limited uniquely.

In the embodiment of the invention, the auxiliary motor is a three-phase alternating-current motor, and the output shaft drives the fan, the water pump and other auxiliary machinery equipment to realize specific functions.

In the embodiment of the invention, the integrated management monitoring device can comprise a processor, a liquid crystal display screen, a power supply for supplying electric energy and a communication module. A processor in the comprehensive management monitoring device can perform analysis and calculation according to tasks required to be executed and the current system operation condition, the analysis and calculation results are displayed on the liquid crystal display screen, a proper common frequency converter is selected, corresponding auxiliary machine motor control parameters are sent to the selected common frequency converter through the communication module, a proper switch array conduction path is calculated and selected, a conduction instruction is sent to a switch array control unit of the switch array through the communication module, and the conduction path required by the gating of the contactor is controlled.

The present invention will be described in detail by taking three common frequency converters and six auxiliary motors as examples. As shown in fig. 1, in a certain marine electric drive system, auxiliary motor a1 and auxiliary motor a2 are backup for each other, auxiliary motor b1 and auxiliary motor b2 are backup for each other, and auxiliary motor c1 and auxiliary motor c2 are backup for each other, and in a certain operating condition, it is necessary to start one of auxiliary motor a1 and auxiliary motor a2, and start one of auxiliary motor b1 and auxiliary motor b 2. According to the above-mentioned use requirement, the integrated management monitoring device 3 analyzes the states of the currently idle universal common frequency converter 1 and the switch array 2, selects the universal common frequency converter a to drive the auxiliary motor a1, and selects the universal common frequency converter B to drive the auxiliary motor B2, so that the integrated management monitoring device 3 loads the control parameters of the auxiliary motor a1 into the universal common frequency converter a through the network, loads the control parameters of the auxiliary motor B2 into the universal common frequency converter B through the network, and sends a turn-on command to the PLC control unit in the switch array 2, and the PLC control unit turns on the switches in the switch array 2 to connect the line between the universal common frequency converter a and the auxiliary motor a1 and the line between the universal common frequency converter B and the auxiliary motor B2. If the operation condition changes, the auxiliary motor B2 needs to be shut down, when the auxiliary motor c1 is started, the integrated management monitoring device 3 sends a shutdown instruction to the common frequency converter B, after the shutdown is completed, the integrated management monitoring device 3 sends a new conduction instruction to the PLC control unit in the switch array 2 so as to communicate the line between the common frequency converter B and the auxiliary motor c1, and loads the control program of the auxiliary motor c1 into the common frequency converter B for execution, thereby realizing the time-sharing multiplexing of the common frequency converter. If any one of the universal public frequency converter A and the universal public frequency converter B fails, the universal public frequency converter C can be started to replace the function of the universal public frequency converter C, so that the backup effect is achieved.

Fig. 2 shows an example of a switch array configuration suitable for use in a marine electrical drive system. The switch array is provided with three input interfaces connected with three universal common frequency converters, six output interfaces connected with six auxiliary machine motors, and eighteen controllable switches used for connecting and gating the corresponding universal common frequency converters and the auxiliary machine motors. The on and off of the controllable switch can be controlled by the PLC control unit. Because each controllable switch in the switch array is configured independently, any output point can be powered by three controllable switches, and therefore the switch array has high redundancy and reliability.

As shown in fig. 3, the common frequency converter includes a DSP control circuit, a CAN bus communication circuit, a bus voltage detection circuit, a phase current detection circuit, a signal conditioning circuit, an analog-to-digital conversion circuit, a module power main circuit, and the like. The control parameters sent by the comprehensive management monitoring device are processed by the CAN bus communication circuit and then loaded by the DSP control circuit, the DSP control circuit sends SVPWM control signals to control the power main circuit of the module according to current feedback signals, and then the auxiliary motor is controlled to run, wherein the current feedback signals are formed by actual three-phase currents through a phase current detection circuit, a signal conditioning circuit and an analog-to-digital conversion circuit, and are used for realizing the control of the rotating speed and the power of the motor.

The bus voltage detection circuit is used for detecting a voltage value of a power grid so as to adjust control parameters of the module power main circuit;

the phase current detection circuit is used for measuring actual three-phase current through a current sensor to obtain a current signal which can be responded;

the signal conditioning circuit is used for conditioning and converting the current signal so as to facilitate signal sampling;

the analog-to-digital conversion circuit is used for realizing signal sampling, and sampling the current signal of the analog quantity to generate the current value of the digital quantity, thereby being convenient for the DSP to control.

The ship electric transmission system based on the time-sharing multiplexing of the frequency converter is different from the configuration mode that the traditional auxiliary machine motors and the frequency converters are in one-to-one correspondence, the traditional special frequency converter is changed into the common frequency converter based on the time-sharing multiplexing, the configuration quantity of equipment is greatly reduced, the running reliability of the system is improved while the equipment quantity is reduced, and the integration level of the electric transmission system can be improved.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.