Converter control method and device
阅读说明：本技术 一种变流器控制方法及装置 (Converter control method and device ) 是由 冯瑜瑶 武亮亮 荆雷 周哲 李兴林 于 2020-06-22 设计创作，主要内容包括：本申请实施例提供一种变流器控制方法及装置,涉及通信技术领域,解决了电源设备输出的电能质量较差的技术问题。该方法包括：变流器控制装置首先确定变流器的原始调制波和原始调制波的幅值,并根据原始调制波的幅值,确定辅助波。该辅助波用于减少原始调制波中的谐波。然后将辅助波添加到原始调制波中,以得到目标调制波,并根据目标调制波,对变流器的载波进行调制,以生成控制信号,并根据控制信号控制变流器的运行状态。(The embodiment of the application provides a converter control method and device, relates to the technical field of communication, and solves the technical problem that the quality of electric energy output by power supply equipment is poor. The method comprises the following steps: the converter control device firstly determines the original modulation wave of the converter and the amplitude of the original modulation wave, and determines the auxiliary wave according to the amplitude of the original modulation wave. The auxiliary wave is used to reduce harmonics in the original modulated wave. And then adding the auxiliary wave to the original modulation wave to obtain a target modulation wave, modulating the carrier wave of the converter according to the target modulation wave to generate a control signal, and controlling the operation state of the converter according to the control signal.)
1. A converter control method, comprising:
determining an original modulation wave of a current transformer and the amplitude of the original modulation wave;
determining an auxiliary wave according to the amplitude of the original modulation wave; the auxiliary wave is used for reducing harmonic waves in the original modulation wave;
adding the auxiliary wave to the original modulation wave to obtain a target modulation wave;
modulating a carrier wave of the converter according to the target modulation wave to generate a control signal;
and controlling the running state of the converter according to the control signal.
2. The converter control method of claim 1, wherein said determining an auxiliary wave based on the amplitude of said original modulated wave comprises:
determining the amplitude N of the auxiliary wave according to the amplitude M of the original modulation wave;
determining the auxiliary wave according to the amplitude M of the original modulation wave and the amplitude N of the auxiliary wave; the auxiliary wave comprising a first wavelet V1The second wavelet V2And a third wavelet V3；
The amplitude M of the original modulation wave, the amplitude N of the auxiliary wave, and the first wavelet V1Said second wavelet V2And said third wavelet V3Satisfies the following formula:
N＝aM2-bM+c；
V1＝U[M cos(ωt)+N cos(3ωt)]；
wherein a, b and c are fixed constants, U is the output voltage of the converter, omega is the fundamental wave angular frequency, and t is a time constant.
3. The converter control method of claim 1, wherein said modulating a carrier of said converter according to said target modulation wave to generate a control signal comprises:
acquiring a voltage corresponding to the target modulation wave and a voltage corresponding to the carrier wave at the same time;
if the voltage corresponding to the target modulation wave is larger than the voltage corresponding to the carrier wave, generating a high-level signal; the high-level signal is used for controlling the converter to start and operate;
if the voltage corresponding to the target modulation wave is smaller than the voltage corresponding to the carrier wave, generating a low-level signal; and the low level signal is used for controlling the converter to stop running.
4. The converter control method of claim 1, wherein said determining the original modulation wave of the converter and the amplitude of said original modulation wave comprises:
acquiring output voltage and output current of the converter;
and determining the original modulation wave of the converter and the amplitude of the original modulation wave according to the output voltage and the output current of the converter and a preset algorithm.
5. A converter control apparatus, comprising: the device comprises a determining unit, a processing unit, a generating unit and a control unit;
the determining unit is used for determining an original modulation wave of the current transformer and the amplitude of the original modulation wave;
the determining unit is further configured to determine an auxiliary wave according to the amplitude of the original modulated wave; the auxiliary wave is used for reducing harmonic waves in the original modulation wave;
the processing unit is used for adding the auxiliary wave determined by the determining unit into the original modulated wave to obtain a target modulated wave;
the generating unit is used for modulating the carrier wave of the converter according to the target modulation wave obtained by the processing unit so as to generate a control signal;
and the control unit is used for controlling the running state of the converter according to the control signal generated by the generation unit.
6. The converter control apparatus according to claim 5, wherein the determining unit is specifically configured to:
determining the amplitude N of the auxiliary wave according to the amplitude N of the original modulation wave;
determining the auxiliary wave according to the amplitude M of the original modulation wave and the amplitude N of the auxiliary wave; the auxiliary wave comprising a first wavelet V1The second wavelet V2And a third wavelet V3；
The amplitude M of the original modulation wave, the amplitude N of the auxiliary wave, and the first wavelet V1Said second wavelet V2And said third wavelet V3Satisfies the following formula:
N＝aM2-bM+c；
V1＝U[M cos(ωt)+N cos(3ωt)]；
wherein a, b and c are fixed constants, U is the output voltage of the converter, omega is the fundamental wave angular frequency, and t is a time constant.
7. The converter control apparatus according to claim 5, wherein the generating unit is specifically configured to:
acquiring a voltage corresponding to the target modulation wave and a voltage corresponding to the carrier wave at the same time;
if the voltage corresponding to the target modulation wave is larger than the voltage corresponding to the carrier wave, generating a high-level signal; the high-level signal is used for controlling the converter to start and operate;
if the voltage corresponding to the target modulation wave is smaller than the voltage corresponding to the carrier wave, generating a low-level signal; and the low level signal is used for controlling the converter to stop running.
8. The converter control apparatus according to claim 5, wherein the determining unit is specifically configured to:
acquiring output voltage and output current of the converter;
and determining the original modulation wave of the converter and the amplitude of the original modulation wave according to the output voltage and the output current of the converter and a preset algorithm.
9. The converter control device is characterized by comprising a memory and a processor; the memory is used for storing computer execution instructions, and the processor is connected with the memory through a bus;
the processor executes the computer-executable instructions stored in the memory to cause the converter control apparatus to perform the converter control method of any one of claims 1-4 when the converter control apparatus is operating.
10. A computer-readable storage medium, comprising computer-executable instructions that, when executed on a computer, cause the computer to perform the converter control method of any one of claims 1-4.
Technical Field
The invention relates to the technical field of communication, in particular to a converter control method and device.
Background
The communication system includes a power supply device for providing services to the communication device. The quality of the power output by the power supply device directly determines whether the communication system can work normally. With the development of communication technology, the demand of the communication system on the quality of the electric energy output by the power supply equipment is higher and higher.
The converter is a core device in the power supply device, and can be used for inverting the direct current in the power supply device into alternating current or rectifying the alternating current into direct current. When the converter converts direct current or alternating current, the converter can generate a control signal according to the direct current or the alternating current to control the operation state of the converter. However, when the converter generates the control signal, harmonic may be generated in the control signal, so that harmonic may also be generated in the voltage output by the converter, and the quality of the electric energy output by the power supply device is poor.
Disclosure of Invention
The application provides a converter control method and device, and solves the technical problem that the quality of electric energy output by power supply equipment is poor.
In order to achieve the purpose, the technical scheme is as follows:
in a first aspect, a converter control method is provided, including: the converter control device firstly determines the original modulation wave of the converter and the amplitude of the original modulation wave, and determines the auxiliary wave according to the amplitude of the original modulation wave. The auxiliary wave is used to reduce harmonics in the original modulated wave. Then, the auxiliary wave is added to the original modulation wave to obtain a target modulation wave, and the carrier wave of the converter is modulated according to the target modulation wave to generate a control signal. Subsequently, the converter control device controls the operation state of the converter according to the control signal.
It can be seen that the converter control device modulates the carrier wave of the converter according to the original modulation wave added with the auxiliary wave (i.e. the above-mentioned target modulation wave), generates the control signal, and controls the operation state of the converter according to the control signal. Since the auxiliary wave is used to reduce harmonics in the original modulated wave, harmonics in the control signal generated by the converter control means are reduced accordingly. Correspondingly, harmonic waves in the voltage output by the converter are correspondingly reduced, and the quality of the electric energy output by the power supply equipment (including the converter) is improved. Further optionally, when the harmonic in the voltage output by the converter is reduced, the number of the filters does not need to be increased by the power supply equipment to reduce the harmonic in the voltage output by the converter, so that the size and the weight of the power supply equipment are reduced, and the installation efficiency of the power supply equipment is improved.
In a second aspect, there is provided a converter control apparatus comprising: the device comprises a determining unit, a processing unit, a generating unit and a control unit; the determining unit is used for determining the original modulation wave of the converter and the amplitude of the original modulation wave; the determining unit is further used for determining the auxiliary wave according to the amplitude of the original modulation wave; the auxiliary wave is used for reducing the harmonic waves in the original modulation wave; the processing unit is used for adding the auxiliary wave determined by the determining unit into the original modulation wave to obtain a target modulation wave; the generating unit is used for modulating the carrier wave of the converter according to the target modulation wave obtained by the processing unit so as to generate a control signal; and the control unit is used for controlling the running state of the converter according to the control signal generated by the generation unit.
In a third aspect, a converter control apparatus is provided that includes a memory and a processor. The memory is used for storing computer execution instructions, and the processor is connected with the memory through a bus. When the converter control device is operated, the processor executes computer-executable instructions stored in the memory to cause the converter control device to perform the converter control method according to the first aspect.
The converter control device may be a network device, or may be a part of a network device, such as a system on chip in the network device. The chip system is configured to support the network device to implement the functions related to the first aspect and any one of the possible implementations thereof, for example, to receive, determine, and shunt data and/or information related to the converter control method. The chip system includes a chip and may also include other discrete devices or circuit structures.
In a fourth aspect, a computer-readable storage medium is provided, which comprises computer-executable instructions, which, when executed on a computer, cause the computer to perform the converter control method according to the first aspect.
In a fifth aspect, a computer program product is provided, which comprises computer instructions that, when run on a computer, cause the computer to perform the converter control method according to the first aspect and its various possible implementations.
It should be noted that all or part of the above computer instructions may be stored on the first computer readable storage medium. The first computer readable storage medium may be packaged with the processor of the converter control device, or may be packaged separately from the processor of the converter control device, which is not limited in this application.
For the description of the second, third, fourth and fifth aspects of the present invention, reference may be made to the detailed description of the first aspect; in addition, for the beneficial effects described in the second aspect, the third aspect, the fourth aspect and the fifth aspect, reference may be made to beneficial effect analysis of the first aspect, and details are not repeated here.
In the present application, the names of the converter control devices mentioned above do not limit the devices or functional modules themselves, which may be presented by other names in a practical implementation. Insofar as the functions of the respective devices or functional blocks are similar to those of the present invention, they are within the scope of the claims of the present invention and their equivalents.
These and other aspects of the invention will be more readily apparent from the following description.
Drawings
Fig. 1 is a schematic structural diagram of a power supply apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic hardware structure diagram of a converter control device according to an embodiment of the present disclosure;
fig. 3 is a schematic hardware structure diagram of another converter control device according to an embodiment of the present disclosure;
fig. 4 is a schematic flowchart of a converter control method according to an embodiment of the present disclosure;
fig. 5 is a schematic flowchart of another converter control method according to an embodiment of the present disclosure;
fig. 6 is a schematic flowchart of another converter control method according to an embodiment of the present disclosure;
fig. 7 is a schematic flowchart of another converter control method according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a converter control device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
For the convenience of clearly describing the technical solutions of the embodiments of the present application, in the embodiments of the present application, the terms "first" and "second" are used to distinguish the same items or similar items with basically the same functions and actions, and those skilled in the art can understand that the terms "first" and "second" are not used to limit the quantity and execution order.
As described in the background, when the converter converts a direct current or an alternating current, the converter may generate a control signal according to the direct current or the alternating current to control an operation state of the converter. However, when the converter generates the control signal, harmonic waves may be generated in the control signal, so that when the voltage output by the converter is in the middle, harmonic voltages may also be generated, thereby causing poor quality of the electric energy output by the power supply device.
In view of the above problems, embodiments of the present application provide a converter control method, in which an auxiliary wave is added to an original modulation wave to reduce harmonics in an output voltage of a converter, so that the number of low-pass filters is not required to be increased, and the quality of electric energy output by power supply equipment (including the converter) is improved while the reduction of the harmonic voltage is ensured. Further optionally, when the harmonic in the voltage output by the converter is reduced, the number of the filters does not need to be increased by the power supply equipment to reduce the harmonic in the voltage output by the converter, so that the size and the weight of the power supply equipment are reduced, and the installation efficiency of the power supply equipment is improved.
The converter control method provided by the embodiment of the application is suitable for the power supply equipment 10. Fig. 1 shows one structure of the power supply device 10. As shown in fig. 1, the power supply apparatus 10 includes: converter control means 11, a converter 12 and a filter 13. The converter 12 is connected to the converter control device 11 and the filter 13, respectively.
Here, the converter control device 11 and the converter 12 may be provided independently or may be integrated in the same device, and the present application is not limited thereto.
For the convenience of understanding, the present application mainly describes an example in which the converter control device 11 and the converter 12 are independently provided.
The converter control device 11 and the converter 12 may be connected by a wire or wirelessly.
It is easy to understand that when the converter control device 11 and the converter 12 are integrated in the same device, the communication mode between the converter control device 11 and the converter 12 is the communication between the internal modules of the device. In this case, the communication flow between the two is the same as "the communication flow between the converter control device 11 and the converter 12 when they are independent of each other".
The inverter 12 is an electrical device that can vary the voltage, frequency, number of phases, and other electrical quantities or characteristics of the power supply device 10. In the embodiment of the present application, the converter 12 is mainly used to invert the dc power in the power supply device into ac power, or rectify the ac power into dc power.
The filter 13 is a filter circuit composed of a capacitor, an inductor, and a resistor. The filter 13 may effectively filter a frequency point of a specific frequency in the power supply device 10 or frequencies other than the frequency point to obtain a power supply signal of the specific frequency, or eliminate the power supply signal of the specific frequency. In the embodiment of the present application, the filter 13 is mainly used for eliminating the harmonic voltage generated by the converter 12.
The basic hardware structure of the converter control device 11, the converter 12 and the filter 13 in fig. 1 is similar, and all include the components included in the converter control device shown in fig. 2. The hardware configuration of the converter control device 11, the converter 12, and the filter 13 in fig. 1 will be described below by taking the converter control device shown in fig. 2 as an example.
Fig. 2 shows a hardware structure diagram of a converter control device provided in an embodiment of the present application. As shown in fig. 2, the converter control device includes a processor 21, a memory 22, a communication interface 23, and a bus 24. The processor 21, the memory 22 and the communication interface 23 may be connected by a bus 24.
The processor 21 is a control center of the converter control device, and may be a single processor or a collective term for a plurality of processing elements. For example, the processor 21 may be a Central Processing Unit (CPU), other general-purpose processors, or the like. Wherein a general purpose processor may be a microprocessor or any conventional processor or the like.
For one embodiment, processor 21 may include one or more CPUs, such as CPU 0 and CPU 1 shown in FIG. 2.
The memory 22 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
In a possible implementation, the memory 22 may exist separately from the processor 21, and the memory 22 may be connected to the processor 21 via a bus 24 for storing instructions or program codes. The converter control method provided by the embodiment of the present invention can be implemented when the processor 21 calls and executes the instructions or program codes stored in the memory 22.
In another possible implementation, the memory 22 may also be integrated with the processor 21.
And a communication interface 23 for connecting with other devices through a communication network. The communication network may be an ethernet network, a radio access network, a Wireless Local Area Network (WLAN), or the like. The communication interface 23 may include a receiving unit for receiving data, and a transmitting unit for transmitting data.
The bus 24 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 2, but it is not intended that there be only one bus or one type of bus.
It is to be noted that the structure shown in fig. 2 does not constitute a limitation of the converter control device. The converter control means may comprise more or less components than those shown in fig. 2, or some components may be combined, or a different arrangement of components than those shown.
Fig. 3 shows another hardware configuration of the converter control apparatus in the embodiment of the present application. As shown in fig. 3, the converter control means may comprise a
The function of the
The
It should be noted that the configuration shown in fig. 2 (or fig. 3) does not constitute a limitation of the converter control device, which may comprise more or less components than those shown in fig. 2 (or fig. 3), or may combine some components, or a different arrangement of components, in addition to the components shown in fig. 2 (or fig. 3).
The converter control method provided by the embodiment of the present application is described in detail below with reference to the power supply apparatus shown in fig. 1 and the converter control device shown in fig. 2 (or fig. 3).
Fig. 4 is a schematic flowchart of a converter control method according to an embodiment of the present application. As shown in fig. 4, the converter control method includes S401 to S405.
S401, the converter control device determines the original modulation wave and the amplitude of the original modulation wave of the converter.
Specifically, the converter includes: rectifier circuit, inverter circuit, alternating current conversion circuit and direct current conversion circuit. The rectifier circuit is a circuit for rectifying received alternating current into direct current. The inverter circuit corresponds to the rectifier circuit and is a circuit for inverting a received direct current into an alternating current. The ac conversion circuit is a circuit for converting the voltage and frequency of ac power. Accordingly, the dc conversion circuit is a circuit for converting voltage and frequency of dc power.
In the embodiment of the application, the converter control device can determine the original modulation wave and the amplitude thereof of the converter according to the output voltage and the output current in the rectifying circuit or the inverting circuit and a preset algorithm. The preset algorithm may be a voltage-current double closed-loop method, or may be other algorithms for determining a modulation wave, which is not limited in the embodiment of the present application. For convenience of description, in the embodiments of the present application, a preset algorithm is used as a voltage-current double closed-loop method for description, and specific steps of the voltage-current double closed-loop method may refer to descriptions in the prior art, which are not repeated herein.
Specifically, the converter control device firstly obtains the output voltage and the output current of the converter according to a rectifying circuit in the converter, then converts the voltage and the frequency of the direct current according to a direct current conversion circuit, and then determines the original modulation wave and the amplitude value of the converter according to a voltage-current double closed-loop method.
Correspondingly, the converter control device can also obtain the output voltage and the output current of the converter according to an inverter circuit in the converter, then convert the voltage and the frequency of the direct current according to an alternating current conversion circuit, and then determine the original modulation wave and the amplitude value of the converter according to a voltage-current double closed-loop method.
S402, the converter control device determines an auxiliary wave according to the amplitude of the original modulation wave.
Wherein the auxiliary wave is used to reduce harmonics in the original modulated wave.
When the converter control device generates a control signal from the original modulation wave, a large amount of harmonics are generated in the output voltage of the converter. In order to reduce harmonics in the converter output voltage, the converter control device may add an auxiliary wave for reducing harmonics in the original modulated wave to reduce harmonics in the converter output voltage.
Specifically, after the original modulation wave is determined, the converter control device firstly normalizes the original modulation wave to prevent the converter control device from generating overshoot when the target modulation wave is determined. Then, the converter control device determines the amplitude N of the auxiliary wave according to the amplitude M of the original modulation wave, wherein the amplitude M of the original modulation wave and the amplitude N of the auxiliary wave satisfy the following formula (1):
N＝aM2-bM + c; formula (1)
Then, the converter control device determines the auxiliary wave based on the amplitude M of the original modulation wave and the amplitude N of the auxiliary wave. Wherein the auxiliary wave comprises a first wavelet V1The second wavelet V2And a third wavelet V3. Amplitude M of original modulation wave, amplitude N of auxiliary wave, and first wavelet V1The second wavelet V2And a third wavelet V3Satisfying the following formula (2), formula (3) and formula (4):
V1＝U[M cos(ωt)+N cos(3ωt)](ii) a Formula (2)
Wherein a, b and c are fixed constants, U is the output voltage of the converter, omega is the fundamental wave angular frequency, and t is a time constant.
Optionally, the auxiliary wave is input into matrix laboratory (MATLAB) simulation software, so that when the amplitude N of the auxiliary wave is greater than 0, the amplitude of the output voltage harmonic of the converter may be effectively reduced, and when the amplitude N of the auxiliary wave is less than 0, the amplitude of the output voltage harmonic of the converter may be increased.
According to the amplitude M of the original modulation wave, the amplitude N of the auxiliary wave and the MATLAB curve fitting function, when a is-0.0223, b is 0.3348 and c is 0.5837, the amplitude N of the auxiliary wave determined by the converter control device can reduce the harmonic wave output by the converter to the maximum amplitude. That is, the amplitude M of the original modulation wave and the amplitude N of the auxiliary wave satisfy the following formula (5):
N＝-0.0223M2-0.3348M + 0.5837; formula (5)
And S403, adding the auxiliary wave to the original modulation wave by the converter control device to obtain a target modulation wave.
Specifically, after the auxiliary wave is determined, the converter control device adds the auxiliary wave to the original modulation wave to obtain the target modulation wave. As can be seen from the formulas (2), (3) and (4), the auxiliary wave is a common-mode component, and therefore, the converter control device adds the auxiliary wave to the original modulated wave without adding a new harmonic. Secondly, after the converter control device adds the auxiliary wave into the original modulation wave, because of the superposition of the third harmonic wave (namely the auxiliary wave), the phase voltage output by the inverter circuit must contain the third harmonic component, and the third harmonic component can be mutually offset with partial harmonic wave in the voltage harmonic wave output by the inverter circuit, thereby reducing the harmonic wave in the original modulation wave.
S404, the converter control device modulates the carrier wave of the converter according to the target modulation wave to generate a control signal.
Wherein the control signal is used for controlling the operation state of the power supply device comprising the converter.
Optionally, the converter further includes: a trigger circuit and a control circuit. The trigger circuit is a circuit for controlling on/off of the power switching element. The control circuit is used for regulating and controlling the electric energy.
The converter control device modulates a carrier of the converter according to the target modulation wave to generate a control signal, and then sends the control signal to the trigger circuit and the control circuit to control an operation state of the power supply apparatus including the converter.
Specifically, the converter control device obtains a voltage corresponding to the target modulation wave and a voltage corresponding to the carrier wave at the same time. And if the voltage corresponding to the target modulation wave is greater than the voltage corresponding to the carrier wave, the converter control device generates a high-level signal. And if the voltage corresponding to the target modulation wave is less than the voltage corresponding to the carrier wave, the converter control device generates a low-level signal. And the high-level signal is used for controlling the converter to start running. And the low level signal is used for controlling the converter to stop running.
Optionally, when the carrier of the converter is modulated according to the target modulation wave, the converter control device may modulate the carrier of the converter according to a Phase Displacement (PD) modulation scheme and an alternating phase displacement (APOD) modulation scheme. The embodiment of the application can also analyze the advantages and disadvantages of the PD modulation mode and the APOD modulation mode to determine the optimal modulation mode.
For example, the output voltage of the converter is a three-phase voltage, and the output current of the converter is a three-phase current, the converter control device may determine the three-phase original modulation wave according to the three-phase voltage and the three-phase current. The three-phase original modulation waves have equal amplitude and 120-degree phase difference, and the expression is shown in the following formula (5):
wherein, Va、VbAnd VcThe three-phase original modulation waves are respectively, U is the output voltage of the converter, M is the amplitude of the three-phase original modulation waves, omega is the angular frequency of a fundamental wave, and t is a time constant.
The converter control device converts the three-phase original modulation wave in the formula (5) according to a double Fourier transform method to obtain an expression of the voltage harmonic wave P, which is shown in the following formula (6):
wherein, thetaxAngle of three-phase original modulated wave, x ∈ (a, b, c), θx∈(0°、120°、240°)；Is the carrier angular frequency; m is the frequency of carrier frequency; n is the frequency of fundamental wave; hmnAnd determining harmonic component coefficients for the converter control device according to a double Fourier transform method.
After the voltage harmonic P is determined, the converter control device can analyze the advantages and disadvantages of the PD modulation mode and the APOD modulation mode from three aspects of harmonic diffusivity, harmonic amplitude of converter output voltage and voltage harmonic amplitude near a resonance point of the filter so as to determine the optimal modulation mode.
When the converter control device analyzes the advantages and disadvantages of the PD modulation mode and the APOD modulation mode from the harmonic diffusivity, firstly, the amplitude M of the original modulation wave is input into matrix laboratory (MATLAB) simulation software, so that the diffusivity of the harmonic is related to the amplitude M of the original modulation wave, and the diffusivity of the harmonic after passing through the APOD modulation mode is much smaller than the diffusivity of the harmonic after passing through the PD modulation mode.
When the converter control device analyzes the advantages and disadvantages of the PD modulation scheme and the APOD modulation scheme from the harmonic amplitude of the converter output voltage, it can be seen from the above equation (6) that the harmonic component coefficients of the harmonic passing through the PD modulation scheme are mainly H12, H14, H18, H21, H25, and H27. The harmonic component coefficients of the harmonic wave after passing through the APOD modulation mode are mainly H11, H15, H17, H21, H25 and H27. The harmonic corresponding to the harmonic component coefficient is input into MATLAB simulation software, and when the amplitude M of the original modulation wave is 0.3, the harmonic component coefficient H21 of the harmonic passing through the PD modulation mode is 0.0925 at most. When the amplitude M of the original modulated wave is 0.6, the maximum value of the harmonic component coefficient H11 of the harmonic wave after passing through the APOD modulation method is 0.1851. From this, it is understood that the harmonic amplitude is large although the harmonic diffusivity after the APOD modulation method is small and the resonance point of the high-order filter can be effectively avoided.
When the converter control device analyzes the advantages and disadvantages of the PD modulation mode and the APOD modulation mode from the amplitude of the voltage harmonic wave near the resonance point of the filter, firstly, the resonance point of the filter is obtained, the frequency of the voltage harmonic wave of the resonance point can be determined according to the resonance frequency, and then according to the formula (6), the amplitude of the voltage harmonic wave near the resonance point of the filter is increased along with the increase of the amplitude M of the original modulation wave in the PD modulation mode, so that the PD modulation mode can trigger the resonance peak of the filter more easily. And the amplitude of the voltage harmonic near the resonance point of the filter is zero along with the increase of the amplitude M of the original modulation wave in the APOD modulation mode, so that the resonance peak of the filter is not easy to trigger in the APOD modulation mode.
In order to verify the analysis result, the PD modulation mode and the APOD modulation mode are input into MATLAB simulation software, and it is known that since the dispersion degree of the harmonic of the converter output voltage in the PD modulation mode is large, the dispersed voltage harmonic is dispersed into the resonance point of the filter, so that a large amount of harmonic of the resonant frequency sub-current exists in the converter output voltage, the quality of the converter output voltage is seriously affected, and further, the quality of the power supply output power is poor. The APOD modulation mode has the characteristics of concentrated voltage distribution and small harmonic diffusion degree, and avoids the resonance peak of the filter, so that no resonance current exists in the voltage harmonic output by the converter, and the quality and stability of the output voltage of the power supply equipment are greatly improved.
And S405, controlling the running state of the converter by the converter control device according to the control signal.
After modulating a carrier of the converter according to the target modulation wave to generate a control signal, the converter control device controls an operation state of the converter according to the control signal.
Optionally, if the converter control device generates a high level signal, the converter control device controls the converter to start operation according to the control signal. And if the converter control device generates a low level signal, the converter control device controls the converter to stop running according to the control signal.
It can be seen that the converter control device in the present application modulates the carrier of the converter according to the original modulation wave added with the auxiliary wave (i.e. the above-mentioned target modulation wave), generates the control signal, and controls the operation state of the converter according to the control signal. Since the auxiliary wave is used to reduce harmonics in the original modulated wave, harmonics in the control signal generated by the converter control means are reduced accordingly. Correspondingly, harmonic waves in the voltage output by the converter are correspondingly reduced, and the quality of the electric energy output by the power supply equipment (including the converter) is improved. Further optionally, when the harmonic in the voltage output by the converter is reduced, the number of the filters does not need to be increased by the power supply equipment to reduce the harmonic in the voltage output by the converter, so that the size and the weight of the power supply equipment are reduced, and the installation efficiency of the power supply equipment is improved.
Optionally, in combination with fig. 4, as shown in fig. 5, S401 may be replaced by S501-S502.
S501, the converter control device obtains the output voltage and the output current of the converter.
S502, the converter control device determines the original modulation wave of the converter and the amplitude of the original modulation wave according to the output voltage and the output current of the converter and a preset algorithm.
Optionally, in conjunction with fig. 5, as shown in fig. 6, S402 may be replaced with S601-S602.
S601, the converter control device determines the amplitude N of the auxiliary wave according to the amplitude M of the original modulation wave.
S602, the converter control device determines the auxiliary wave according to the amplitude M of the original modulation wave and the amplitude N of the auxiliary wave.
The auxiliary wave comprising a first wavelet V1The second wavelet V2And a third wavelet V3。
Amplitude M of original modulation wave, amplitude N of auxiliary wave, and first wavelet V1The second wavelet V2And a third wavelet V3Satisfies the following formula:
N＝aM2-bM+c；
V1＝U[M cos(ωt)+N cos(3ωt)]；
wherein a, b and c are fixed constants, U is the output voltage of the converter, omega is the fundamental wave angular frequency, and t is a time constant.
Optionally, in conjunction with fig. 6, as shown in fig. 7, S404 may be replaced by S701-S704.
S701, the converter control device obtains a voltage corresponding to the target modulation wave and a voltage corresponding to the carrier wave at the same time.
S702, the converter control device judges whether the voltage corresponding to the target modulation wave is larger than the voltage corresponding to the carrier wave.
If the voltage corresponding to the target modulation wave is greater than the voltage corresponding to the carrier wave, S703 is executed. If the voltage corresponding to the target modulation wave is smaller than the voltage corresponding to the carrier wave, S704 is executed.
And S703, generating a high-level signal by the converter control device.
And the high-level signal is used for controlling the converter to start running.
And S704, generating a low-level signal by the converter control device.
And the low-level signal is used for controlling the converter to stop running.
The scheme provided by the embodiment of the application is mainly introduced from the perspective of a method. To implement the above functions, it includes hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiment of the present application, the converter control device may be divided into the functional modules according to the method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. Optionally, the division of the modules in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
Fig. 8 is a schematic structural diagram of a
a determining
A determining
A
A generating
And a
Optionally, the determining
and determining the amplitude N of the auxiliary wave according to the amplitude M of the original modulation wave. For example, in conjunction with fig. 6, the
Determining an auxiliary wave according to the amplitude M of the original modulation wave and the amplitude N of the auxiliary wave; the auxiliary wave comprising a first wavelet V1The second wavelet V2And a third wavelet V3. For example, in conjunction with fig. 6, the
Amplitude M of original modulation wave, amplitude N of auxiliary wave, and first wavelet V1The second wavelet V2And a third wavelet V3Satisfies the following formula:
N＝aM2-bM+c；
V1＝U[M cos(ωt)+N cos(3ωt)]；
wherein a, b and c are fixed constants, U is the output voltage of the converter, omega is the fundamental wave angular frequency, and t is a time constant.
Optionally, the generating
and acquiring the voltage corresponding to the target modulation wave and the voltage corresponding to the carrier wave at the same time. For example, in conjunction with fig. 7, the
If the voltage corresponding to the target modulation wave is larger than the voltage corresponding to the carrier wave, generating a high-level signal; the high level signal is used for controlling the converter to start running. For example, in conjunction with fig. 7, the generating
If the voltage corresponding to the target modulation wave is smaller than the voltage corresponding to the carrier wave, generating a low-level signal; the low level signal is used for controlling the converter to stop running. For example, in conjunction with fig. 7, the
Optionally, the determining
and acquiring the output voltage and the output current of the converter. For example, in conjunction with fig. 5, the
And determining the amplitude of the original modulation wave and the amplitude of the original modulation wave of the converter according to the output voltage and the output current of the converter and a preset algorithm. For example, in conjunction with fig. 5, the
Embodiments of the present application also provide a computer-readable storage medium, which includes computer-executable instructions. When the computer executes the instructions to run on the computer, the computer is enabled to execute the steps executed by the converter control device in the converter control method provided by the embodiment.
The embodiment of the present application further provides a computer program product, where the computer program product may be directly loaded into a memory and contains software codes, and after the computer program product is loaded and executed by a computer, the computer program product can implement each step executed by the converter control device in the converter control method provided in the foregoing embodiment.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The processes or functions according to the embodiments of the present application are generated in whole or in part when the computer-executable instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). Computer-readable storage media can be any available media that can be accessed by a computer or can comprise one or more data storage devices, such as servers, data centers, and the like, that can be integrated with the media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical function division, and there may be other division ways in actual implementation. For example, various elements or components may be combined or may be integrated into another device, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. Units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed to a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
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