PCC voltage feed-forward control method, device and equipment based on band-pass filter

Abstract

The invention discloses a PCC voltage feed-forward control method, device and equipment based on a band-pass filter and a readable storage medium, and relates to the technical field of power system control. Comprising the following steps: acquiring a PCC voltage signal of a common coupling point of a target power grid, and decomposing the PCC voltage signal by using a band-pass filter to obtain a fundamental wave and each harmonic component; according to the weight values of the fundamental wave and each harmonic component, carrying out weighted summation on the fundamental wave and each harmonic component to obtain a comprehensive voltage signal; and finally, generating an inverter control signal according to the comprehensive voltage signal, and controlling the output of the inverter according to the inverter control signal. According to the method, the harmonic waves in the output voltage of the inverter are effectively suppressed.

Description

Technical Field

[0001] The present invention relates to the field of power system control technology, and in particular to a PCC voltage feedforward control method, device, equipment and readable storage medium based on a bandpass filter. Background Art

[0002] Grid-connected inverters are increasingly used in power grids, but with them come a series of problems, such as voltage harmonics, which have driven the continuous development of related control technologies. In the early days, traditional PI (proportional-integral) current controllers and PR (proportional-resonant) current controllers were mainly used to suppress these problems. However, the parameters of these controllers have a great influence on the output impedance of the inverter, which will affect the system stability and power quality.

[0003] To solve this problem, related studies have proposed design strategies to improve current controller parameters and capacitor current feedback coefficients to suppress low-order current harmonics. At the same time, PCC (point of common coupling) and capacitor voltage feedforward control strategies have also been applied to simulate parallel admittance terms and increase inverter output impedance to reduce harmonics caused by grid voltage distortion. However, various conditions in the grid are constantly changing and are not static. However, these methods cannot be adjusted accordingly according to the real-time conditions of the grid, and thus cannot effectively solve the voltage harmonic problem.

[0004] Therefore, there is an urgent need for a PCC voltage feedforward control method based on a bandpass filter that can overcome the above-mentioned defects. Summary of the invention

[0005] The object of the present invention is to provide a PCC voltage feedforward control method, device, equipment and readable storage medium based on a bandpass filter. The fundamental wave and each harmonic component of the PCC voltage signal are first decomposed, and then these components are superimposed according to their respective weight values. When the proportion of different harmonics in the power grid changes, the method in the present application can dynamically adjust the weights of these components, so as to suppress various harmonics in a more targeted manner, and be more comprehensive and effective in harmonic suppression. When faced with complex power grid conditions, the low-pass filter can decompose and process components according to different harmonics, and can better cope with complex power grid harmonic environments and have stronger adaptability to power grid conditions.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: In a first aspect, the present invention provides a PCC voltage feedforward control method based on a bandpass filter, the method comprising: Obtain the PCC voltage signal of the common coupling point of the target power grid, and decompose the PCC voltage signal using a bandpass filter to obtain the fundamental wave and each harmonic component; According to the weight values ​​of the fundamental wave and each harmonic component, the fundamental wave and each harmonic component are weighted and summed to obtain a comprehensive voltage signal; An inverter control signal is generated according to the integrated voltage signal, and the output of the inverter is controlled according to the inverter control signal.

[0007] In some embodiments, the fundamental wave and each harmonic component are weighted and summed according to their weight values ​​to obtain a comprehensive voltage signal, including: Determine the weight values ​​of the fundamental wave and each harmonic component according to the fundamental wave and each harmonic component; Based on the weight values ​​of the fundamental wave and each harmonic component, the fundamental wave and each harmonic component are weighted and summed to obtain a comprehensive voltage signal.

[0008] In some embodiments, determining weight values ​​of the fundamental wave and each harmonic component according to the fundamental wave and each harmonic component includes: Performing Fourier transform on the fundamental wave and each harmonic component to obtain spectrum data of the fundamental wave and each harmonic component; Based on the spectrum data, the amplitude of the fundamental wave and each harmonic component is calculated; The weight values ​​of the fundamental wave and each harmonic component are calculated according to the amplitudes of the fundamental wave and each harmonic component.

[0009] In some embodiments, generating an inverter control signal according to the integrated voltage signal includes: Inputting the integrated voltage signal into the controller to generate a compensation signal corresponding to the integrated voltage signal; Based on the compensation signal, an inverter control signal is generated.

[0010] In some embodiments, the method further comprises: Acquire the harmonic content of the voltage output by the inverter under the control of the inverter control signal and the system stability data of the target power grid; Based on the harmonic content and system stability data, the filtering parameters of the bandpass filter are adjusted.

[0011] In some embodiments, adjusting filtering parameters of a bandpass filter based on harmonic content and system stability data includes: Input the harmonic content and system stability data into the pre-trained filter parameter prediction model to obtain the target parameters of the bandpass filter; Based on the target parameters, filter parameters of the bandpass filter are adjusted.

[0012] In a second aspect, the present invention further provides a PCC voltage feedforward control device based on a bandpass filter, the device comprising: A signal decomposition module is used to obtain the PCC voltage signal of the common coupling point of the target power grid, and decompose the PCC voltage signal using a bandpass filter to obtain the fundamental wave and each harmonic component; A weighted summation module is used to perform weighted summation on the fundamental wave and each harmonic component according to their weight values ​​to obtain a comprehensive voltage signal; The output control module is used to generate an inverter control signal according to the integrated voltage signal, and control the output of the inverter according to the inverter control signal.

[0013] In a third aspect, the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the PCC voltage feedforward control method based on the bandpass filter provided in the first aspect is implemented.

[0014] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the PCC voltage feedforward control method based on a bandpass filter provided in the first aspect is implemented.

[0015] In a fifth aspect, the present invention further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the PCC voltage feedforward control method based on a bandpass filter provided in the first aspect.

[0016] The beneficial effects of the present invention are: The PCC voltage feedforward control method based on a bandpass filter provided in the present invention first obtains the PCC voltage signal of the common coupling point of the target power grid, and uses a bandpass filter to decompose the PCC voltage signal to obtain the fundamental wave and each harmonic component; then, according to the weight value of the fundamental wave and each harmonic component, the fundamental wave and each harmonic component are weighted and summed to obtain a comprehensive voltage signal; finally, an inverter control signal is generated according to the comprehensive voltage signal, and the output of the inverter is controlled according to the inverter control signal. That is, the fundamental wave and each harmonic component of the PCC voltage signal are first decomposed, and then these components are superimposed according to their respective weight values. When the proportion of different harmonics in the power grid changes, the method in the present application can dynamically adjust the weights of these components, so as to suppress various harmonics more specifically, and is more comprehensive and effective in harmonic suppression. When facing complex power grid conditions, the low-pass filter can decompose and process components according to different harmonics, and can better cope with complex power grid harmonic environments and have stronger adaptability to power grid conditions.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of a PCC voltage feedforward control method based on a bandpass filter shown in one embodiment of the present invention; Figure 2 An inverter configuration diagram with PCC voltage feedforward control based on a bandpass filter is shown in one embodiment of the present invention; Figure 3 A topological structure diagram of a bandpass filter shown in an embodiment of the present invention; Figure 4 A schematic flow chart of a method for adjusting parameters of a bandpass filter according to an embodiment of the present invention; Figure 5 A schematic diagram of the harmonic suppression effect of a conventional method according to an embodiment of the present invention; Figure 6 A schematic diagram of the harmonic suppression effect of the PCC voltage feedforward control method based on a bandpass filter in the present invention shown in one embodiment of the present invention; Figure 7 It is a flow chart of another PCC voltage feedforward control method based on a bandpass filter shown in an embodiment of the present invention; Figure 8 It is a structural schematic diagram of a PCC voltage feedforward control device based on a bandpass filter according to an embodiment of the present invention; Fig. 9 It is a structural schematic diagram of another PCC voltage feedforward control device based on a bandpass filter shown in an embodiment of the present invention; Fig.10 It is a structural schematic diagram of another PCC voltage feedforward control device based on a bandpass filter shown in an embodiment of the present invention; Fig.11 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that references to "one embodiment", "embodiment", "example embodiment", etc. in this specification refer to the embodiment being described which may include specific features, structures or characteristics, but not every embodiment must include these specific features, structures or characteristics. In addition, such expressions do not refer to the same embodiment. Furthermore, when describing specific features, structures or characteristics in conjunction with an embodiment, whether or not there is an explicit description, it is indicated that incorporating such features, structures or characteristics into other embodiments is within the knowledge of those skilled in the art.

[0021] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] In some embodiments, Figure 1 As shown, a PCC voltage feedforward control method based on a bandpass filter is provided, and the specific method includes: S101, obtaining a PCC voltage signal of a common coupling point of a target power grid, and decomposing the PCC voltage signal using a bandpass filter to obtain a fundamental wave and harmonic components.

[0023] Specifically, Figure 2 and Figure 3 As shown, Figure 2 The inverter configuration diagram with PCC voltage feedforward control based on bandpass filter is shown in Figure 2. Figure 3 is the topological structure diagram of the bandpass filter. Figure 3 The transfer function matrix of the PI controller is , as shown in formula (1): ; in, and are the proportional coefficient and the integral coefficient respectively, and I represents the diagonal identity matrix.

[0024] Controlling latency The transfer function matrix includes the calculation delay and PWM delay 0.5 , as shown in formula (2): ; Based on the voltage sensor, the PCC voltage signal of the common coupling point can be collected in real time. The collected PCC voltage signal can be decomposed by a bandpass filter to obtain the fundamental wave and each harmonic component, where each harmonic component includes high-order harmonics and low-order harmonics, as well as odd-order harmonics and even-order harmonics. The transfer function of the bandpass filter can be expressed as the following formula (3): ; in, is the resonant frequency, Represents the order of the harmonic components including the fundamental wave (n = 1).

[0025] S102, performing weighted summation on the fundamental wave and each harmonic component according to their weight values ​​to obtain a comprehensive voltage signal.

[0026] Specifically, the weight value of each harmonic can be pre-set according to the proportion of the fundamental wave and each harmonic component in the target power grid, and then the fundamental wave and each harmonic component are weighted and summed according to the weight value to obtain a comprehensive voltage signal.

[0027] Optionally, the weight values ​​of the fundamental wave and each harmonic component may be determined according to the fundamental wave and each harmonic component; based on the weight values ​​of the fundamental wave and each harmonic component, the fundamental wave and each harmonic component are weighted and summed to obtain a comprehensive voltage signal.

[0028] Optionally, the method for determining the weight values ​​of the fundamental wave and each harmonic component may be: performing Fourier transform on the fundamental wave and each harmonic component to obtain spectrum data of the fundamental wave and each harmonic component; calculating the amplitude of the fundamental wave and each harmonic component based on the spectrum data; calculating the weight values ​​of the fundamental wave and each harmonic component according to the amplitude of the fundamental wave and each harmonic component.

[0029] Exemplarily, the fundamental wave and each harmonic component in the target power grid can be acquired in real time, and discrete Fourier transform or fast Fourier transform is performed on these fundamental wave and each harmonic component acquired in real time to obtain the frequency spectrum of the fundamental wave and each harmonic component. The specific formula can refer to the following formula (4): ; in, are the fundamental wave and harmonic components in the target power grid, It is the spectrum of the fundamental wave and each harmonic component.

[0030] Then, according to the following formula (5), the amplitude of the fundamental wave and each harmonic component is calculated: ; in, Represents the order of the fundamental wave and each harmonic component, N is the total number of fundamental wave and harmonic components, A n is the amplitude of the fundamental wave and each harmonic component.

[0031] After calculating the amplitude of the fundamental wave and each harmonic component, the weight value of the fundamental wave and each harmonic component can be determined according to the ratio of the amplitude of the fundamental wave and each harmonic component to the total amplitude. Then, the fundamental wave and each harmonic component are weighted and summed according to the weight value to obtain the comprehensive voltage signal. For example, if the amplitude of the fundamental wave is 0.9 and the amplitude of the third harmonic component is 0.1, then the weight value of the fundamental wave can be determined to be 0.9 and the weight value of the third harmonic component is 0.1. Then the comprehensive voltage signal = .

[0032] Optionally, in another embodiment, the method for generating the integrated voltage signal may also be: decomposing the PCC voltage signal into fundamental components by a bandpass filter (BPF) And each harmonic component (h=3,5,7,9…) Use the least mean square error (LMS) algorithm, as shown in formula (6), to calculate the weight values ​​of the fundamental wave and each harmonic: ; in, is the weight value of the hth harmonic, The step size factor is set to 0.05, is the difference between the reference voltage and the actual voltage of the PCC constant voltage signal. The fundamental wave and harmonic components are weighted and summed according to the weight value to generate a comprehensive voltage signal, refer to the following formula (7): ; in, is the weight value of the fundamental wave, Usually close to 1 to ensure the dominance of the fundamental signal, is the weight value of each harmonic component.

[0033] Furthermore, after generating a comprehensive voltage signal based on the weight values ​​of the fundamental wave and each harmonic component, the real-time harmonic detection result of the PCC voltage signal can also be obtained, and the weight values ​​of the fundamental wave and each harmonic component can be optimized through closed-loop feedback, that is, when the harmonic exceeds the preset harmonic threshold, the weight value of the corresponding harmonic component is increased until the harmonic falls within the target range. Specifically, the harmonic value (THD) can be calculated by formula (8): ; The weight value of each harmonic component is calculated based on the calculation results and the preset harmonic threshold. To update, ,in, is the learning rate, which is set to 0.005. The updated weight value can more accurately reflect the proportion of the fundamental wave and each harmonic, and increase the accuracy of the integrated voltage signal.

[0034] S103, generating an inverter control signal according to the integrated voltage signal, and controlling the output of the inverter according to the inverter control signal.

[0035] Specifically, the integrated voltage signal may be input into a controller to generate a compensation signal corresponding to the integrated voltage signal; and based on the compensation signal, an inverter control signal may be generated.

[0036] Exemplarily, the integrated voltage signal can be input into the controller to extract the harmonic signal from the integrated voltage signal, and then generate a signal opposite to the harmonic signal, i.e., a compensation signal. The inverter control signal can be generated by controlling the output voltage of the inverter through PWM so that the inverter directly outputs the compensation signal. Since the compensation signal is a signal opposite to the harmonic signal, it can offset the harmonic signal to achieve the purpose of reducing the harmonic signal.

[0037] The PCC voltage feedforward control method based on the bandpass filter in the above embodiment first obtains the PCC voltage signal of the common coupling point of the target power grid, and decomposes the PCC voltage signal using a bandpass filter to obtain the fundamental wave and each harmonic component; then, according to the weight values ​​of the fundamental wave and each harmonic component, the fundamental wave and each harmonic component are weighted and summed to obtain a comprehensive voltage signal; finally, an inverter control signal is generated according to the comprehensive voltage signal, and the output of the inverter is controlled according to the inverter control signal. That is, the fundamental wave and each harmonic component of the PCC voltage signal are first decomposed, and then these components are superimposed according to their respective weight values. When the proportion of different harmonics in the power grid changes, the method in the present application can dynamically adjust the weights of these components, so as to suppress various harmonics more specifically, and is more comprehensive and effective in harmonic suppression. When facing complex power grid conditions, the low-pass filter can decompose and process components according to different harmonics, and can better cope with complex power grid harmonic environments and have stronger adaptability to power grid conditions.

[0038] In another embodiment, Figure 4 As shown, a method for adjusting parameters of a bandpass filter is further provided, and the specific method includes: S201, obtaining harmonic content of a voltage output by an inverter under control of an inverter control signal and system stability data of a target power grid.

[0039] Among them, the system stability data of the target power grid includes the power angle stability data, voltage stability data and frequency stability data of the target power grid. When the power angle, voltage and frequency stability of the target power grid are poor, it means that the stability data of the target power grid is poor, otherwise it means that the stability data of the target power grid is good.

[0040] Specifically, since the harmonic content of the inverter output voltage is affected by many factors and is not constant, the relevant parameters of the bandpass filter also need to be adjusted according to real-time changes. It is necessary to obtain the harmonic content of the voltage output by the inverter under the control of the inverter control signal and the system stability data of the target power grid in real time through sensors.

[0041] S202, adjusting filtering parameters of the bandpass filter based on the harmonic content and system stability data.

[0042] The filtering parameters include the value of the resonant frequency of the bandpass filter and the proportional and integral coefficients of the bandpass filter control unit.

[0043] Specifically, if the harmonic content of the inverter output voltage exceeds the set threshold, the resonant frequency of the bandpass filter can be adjusted appropriately to enhance the filtering effect on specific harmonics; if the system stability is insufficient, the proportional and integral coefficients of the bandpass filter control unit can be adjusted to optimize the inverter control signal. When the harmonic content does not exceed the set threshold and the system stability is good, there is no need to adjust the filtering parameters of the bandpass filter.

[0044] Optionally, the method for adjusting the filtering parameters of the bandpass filter may also be: inputting harmonic content and system stability data into a pre-trained filtering parameter prediction model to obtain target parameters of the bandpass filter; and adjusting the filtering parameters of the bandpass filter based on the target parameters.

[0045] Specifically, during the historical operation process, the correlation data between the harmonic content and system stability data and the filter parameters will be recorded. The filter parameter prediction model can be trained in advance based on these correlation data. After the harmonic content and system stability data of the inverter output voltage are obtained, they are directly input into the filter parameter prediction model to obtain the target parameters of the bandpass filter; the filter parameters of the bandpass filter can be adjusted to the target parameters.

[0046] The parameter adjustment method of the bandpass filter in the above embodiment first obtains the harmonic content of the voltage output by the inverter under the control of the inverter control signal and the system stability data of the target power grid; then adjusts the filtering parameters of the bandpass filter based on the harmonic content and the system stability data, that is, reverse adjustment of the bandpass filter is achieved according to the output result of the inverter, thereby further reducing the harmonics of the inverter output voltage.

[0047] In another embodiment, Figure 5 The schematic diagram shows the harmonic suppression effect of the traditional method. Figure 6The schematic diagram of the harmonic suppression effect of the PCC voltage feedforward control method based on the bandpass filter in the present invention is shown; from the results, it can be seen that the harmonic suppression of the traditional method, the PCC voltage of the three phases a, b, c still contains a large number of harmonics, making the PCC voltage unstable, while the PCC voltage feedforward control method based on the bandpass filter in the present application significantly reduces the harmonics in the PCC voltage of the three phases a, b, c, making its voltage waveform closer to a sine waveform. Compared with the traditional method, the PCC voltage feedforward control method based on the bandpass filter in the present application can significantly reduce the harmonic distortion in the PCC voltage from 6.1% to 1.42%, and while suppressing the harmonics, it improves the quality of the PCC voltage.

[0048] In order to more comprehensively demonstrate the present solution, this embodiment provides an optional method of PCC voltage feedforward control method based on a bandpass filter, such as Figure 7 As shown: S301, obtaining a PCC voltage signal of a common coupling point of a target power grid, and decomposing the PCC voltage signal by using a bandpass filter to obtain a fundamental wave and harmonic components.

[0049] S302, performing Fourier transform on the fundamental wave and each harmonic component to obtain frequency spectrum data of the fundamental wave and each harmonic component.

[0050] S303, calculating the amplitude of the fundamental wave and each harmonic component based on the spectrum data.

[0051] S304, calculating weight values ​​of the fundamental wave and each harmonic component according to the amplitudes of the fundamental wave and each harmonic component.

[0052] S305 , based on the weight values ​​of the fundamental wave and each harmonic component, weighted sum is performed on the fundamental wave and each harmonic component to obtain a comprehensive voltage signal.

[0053] S306, inputting the integrated voltage signal into the controller to generate a compensation signal corresponding to the integrated voltage signal.

[0054] S307, generating an inverter control signal based on the compensation signal.

[0055] S308, controlling the output of the inverter according to the inverter control signal.

[0056] S309, obtaining the harmonic content of the voltage output by the inverter under the control of the inverter control signal and the system stability data of the target power grid.

[0057] S310, inputting the harmonic content and system stability data into a pre-trained filter parameter prediction model to obtain target parameters of the bandpass filter.

[0058] S311, adjusting filtering parameters of the bandpass filter based on the target parameters.

[0059] The specific process of S301-S311 can refer to the description of the above method embodiment, and its implementation principle and technical effect are similar, which will not be repeated here.

[0060] Based on the same inventive concept, the embodiment of the present application also provides a PCC voltage feedforward control device based on a bandpass filter for implementing the PCC voltage feedforward control method based on a bandpass filter involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of one or more PCC voltage feedforward control devices based on a bandpass filter provided below can refer to the limitations of the PCC voltage feedforward control method based on a bandpass filter above, and will not be repeated here.

[0061] In one embodiment, Figure 8 As shown, a PCC voltage feedforward control device based on a bandpass filter is provided, the device comprising: The signal decomposition module 40 is used to obtain the PCC voltage signal of the common coupling point of the target power grid, and decompose the PCC voltage signal using a bandpass filter to obtain the fundamental wave and each harmonic component; A weighted summing module 41 is used to perform weighted summing of the fundamental wave and each harmonic component according to the weight values ​​of the fundamental wave and each harmonic component to obtain a comprehensive voltage signal; The output control module 42 is used to generate an inverter control signal according to the integrated voltage signal, and control the output of the inverter according to the inverter control signal.

[0062] In another embodiment, Fig. 9 As shown above Figure 8 The weighted summation module 41 in comprises: A weight determination unit 410, configured to determine weight values ​​of the fundamental wave and each harmonic component according to the fundamental wave and each harmonic component; The weighted summing unit 411 is used to perform weighted summing of the fundamental wave and each harmonic component based on the weight values ​​of the fundamental wave and each harmonic component to obtain a comprehensive voltage signal.

[0063] In another embodiment, the above Fig. 9 The weight determination unit 410 is specifically used to: perform Fourier transform on the fundamental wave and each harmonic component to obtain spectrum data of the fundamental wave and each harmonic component; calculate the amplitude of the fundamental wave and each harmonic component based on the spectrum data; calculate the weight value of the fundamental wave and each harmonic component according to the amplitude of the fundamental wave and each harmonic component.

[0064] In another embodiment, the above Figure 8The output control module 42 in the controller is specifically used to: input the integrated voltage signal into the controller to generate a compensation signal corresponding to the integrated voltage signal; and generate an inverter control signal based on the compensation signal.

[0065] In another embodiment, Fig.10 As shown above Figure 8 The PCC voltage feedforward control device based on a bandpass filter also includes: A data acquisition module 43, used to acquire the harmonic content of the voltage output by the inverter under the control of the inverter control signal and the system stability data of the target power grid; The parameter adjustment module 44 is used to adjust the filtering parameters of the bandpass filter based on the harmonic content and the system stability data.

[0066] In another embodiment, the above Fig.10 The parameter adjustment module 44 is specifically used to: input the harmonic content and system stability data into a pre-trained filter parameter prediction model to obtain the target parameters of the bandpass filter; and adjust the filter parameters of the bandpass filter based on the target parameters.

[0067] The present application also provides an electronic device, in some implementations, referring to Fig.11 As shown, the electronic device 700 includes an input unit 710, a memory 720, a processor 730, and an output unit 740. The memory 720 stores program instructions that can be run on the processor 730, and the processor 730 calls the program instructions to execute the PCC voltage feedforward control method and / or technical solution based on the bandpass filter in the above-mentioned embodiment. The electronic device 700 can be a mobile terminal device such as a mobile phone, a computer, etc.

[0068] In addition, the embodiment of the present application also provides a computer-readable storage medium for storing a computer program for executing a PCC voltage feedforward control method based on a bandpass filter. For example, a computer program instruction, when executed by a computer, can call or provide a method and / or technical solution according to the present application through the operation of the computer. The program instruction for calling the method of the present application may be stored in a fixed or removable storage medium, and / or transmitted through a data stream in a broadcast or other signal-bearing medium and / or stored in a storage medium that runs according to the program instruction.

[0069] Obviously, those skilled in the art should understand that the above modules or steps of the present application can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. In this way, the present application is not limited to any specific combination of hardware and software.

[0070] The technical features of the above embodiments may be arbitrarily integrated. To make the description concise, not all possible integrations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the integration of these technical features, they should be considered to be within the scope of this specification.

[0071] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A PCC voltage feedforward control method based on a bandpass filter, characterized in that: The method comprises: Obtaining a PCC voltage signal of a common coupling point of a target power grid, and decomposing the PCC voltage signal using a bandpass filter to obtain a fundamental wave and harmonic components; According to the weight values ​​of the fundamental wave and the harmonic components, weighted summation is performed on the fundamental wave and the harmonic components to obtain a comprehensive voltage signal; An inverter control signal is generated according to the integrated voltage signal, and an output of the inverter is controlled according to the inverter control signal.

2. The PCC voltage feedforward control method based on a bandpass filter according to claim 1, characterized in that: According to the weight values ​​of the fundamental wave and the harmonic components, weighted summing is performed on the fundamental wave and the harmonic components to obtain a comprehensive voltage signal, including: Determining weight values ​​of the fundamental wave and the harmonic components according to the fundamental wave and the harmonic components; Based on the weight values ​​of the fundamental wave and the harmonic components, the fundamental wave and the harmonic components are weighted and summed to obtain a comprehensive voltage signal.

3. The PCC voltage feedforward control method based on a bandpass filter according to claim 2, characterized in that: Determining weight values ​​of the fundamental wave and the harmonic components according to the fundamental wave and the harmonic components includes: Performing Fourier transformation on the fundamental wave and each harmonic component to obtain frequency spectrum data of the fundamental wave and each harmonic component; Based on the frequency spectrum data, calculating the amplitudes of the fundamental wave and each harmonic component; The weight values ​​of the fundamental wave and the harmonic components are calculated according to the amplitudes of the fundamental wave and the harmonic components.

4. The PCC voltage feedforward control method based on a bandpass filter according to claim 1, characterized in that: Generating an inverter control signal according to the integrated voltage signal includes: Inputting the integrated voltage signal into a controller to generate a compensation signal corresponding to the integrated voltage signal; Based on the compensation signal, an inverter control signal is generated.

5. The PCC voltage feedforward control method based on a bandpass filter according to claim 1, characterized in that: The method further comprises: Acquiring harmonic content of a voltage output by the inverter under control of the inverter control signal and system stability data of the target power grid; Based on the harmonic content and system stability data, filtering parameters of the bandpass filter are adjusted.

6. The PCC voltage feedforward control method based on a bandpass filter according to claim 5, characterized in that: Adjusting filtering parameters of the bandpass filter based on the harmonic content and the system stability data includes: Inputting the harmonic content and system stability data into a pre-trained filter parameter prediction model to obtain target parameters of the bandpass filter; Based on the target parameter, a filtering parameter of the bandpass filter is adjusted.

7. A PCC voltage feedforward control device based on a bandpass filter, characterized in that: The device comprises: A signal decomposition module is used to obtain a PCC voltage signal of a common coupling point of a target power grid, and decompose the PCC voltage signal using a bandpass filter to obtain a fundamental wave and harmonic components; A weighted summation module, used for performing weighted summation on the fundamental wave and the harmonic components according to the weight values ​​of the fundamental wave and the harmonic components to obtain a comprehensive voltage signal; The output control module is used to generate an inverter control signal according to the integrated voltage signal, and control the output of the inverter according to the inverter control signal.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the PCC voltage feedforward control method based on a bandpass filter according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the PCC voltage feedforward control method based on a bandpass filter according to any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the PCC voltage feedforward control method based on a bandpass filter according to any one of claims 1 to 6 is implemented.

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