Harmonic compensation method based on ultrashort feedback control mechanism

Abstract

The invention discloses a harmonic compensation method based on an ultra-short feedback control mechanism, and relates to the technical field of power systems. The method is applied to a harmonic compensation device, the device comprises a harmonic source, the harmonic source is connected to a power grid, and the method comprises the following steps: detecting a harmonic signal at a common connection point of the power grid in real time, quickly responding to a detected harmonic waveform through an ultra-short feedback control mechanism, judging whether compensation is needed or not based on feedback information, and if yes, performing compensation. And if the compensation is not needed, closing the harmonic source, and if the compensation is needed, entering the next step. According to the invention, an ultrashort feedback control mechanism is utilized to quickly respond to harmonic changes, a corresponding compensation signal is calculated according to the harmonic frequency and amplitude detected in real time, the output frequency, amplitude and phase of a harmonic source are dynamically adjusted for compensation, and meanwhile, through a dynamic self-adaptive model and an ultrashort feedback algorithm, the harmonic compensation is realized. And the amplitude and phase of the compensation signal are corrected in real time so as to reduce harmonic distortion of the power grid side to the maximum extent.

Description

Technical Field

[0001] The invention relates to the technical field of power systems, and in particular to a harmonic compensation method based on an ultra-short feedback control mechanism. Background Art

[0002] Current harmonic compensation technology mainly relies on predictive control and conventional feedback control, which has problems such as slow response speed and poor compensation effect. Although the predictive control method can pre-calculate the compensation signal, it cannot respond to the changes in the harmonic waveform of the power grid in real time, resulting in a lag in the compensation effect. Although conventional feedback control can adjust the output of the harmonic source in real time, the feedback cycle is long, making it difficult to quickly capture the rapid changes in harmonics and completely eliminate harmonic distortion. Therefore, there is an urgent need for a harmonic compensation method with fast response and high compensation accuracy to effectively solve the harmonic problem of the power grid and improve the steady-state and dynamic stability of the power system. Summary of the invention

[0003] The purpose of the present invention is to provide a harmonic compensation method based on an ultra-short feedback control mechanism to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a harmonic compensation method based on an ultra-short feedback control mechanism, the method is applied to a harmonic compensation device, the device includes a harmonic source, the harmonic source is connected to a power grid, and the method includes the following steps:

[0005] Real-time detection of harmonic signals at the public connection point of the power grid, rapid response to the detected harmonic waveform through the ultra-short feedback control mechanism, and judgment on whether compensation is needed based on the feedback information. If compensation is not needed, the harmonic source is turned off; if compensation is needed, the next step is entered;

[0006] According to the harmonic signal detected in real time, the harmonic frequency and amplitude are quickly determined. Based on this information, the frequency and amplitude of the compensation signal are calculated, and the harmonics are quickly adjusted accordingly;

[0007] The output signal of the harmonic source is adjusted through the ultra-short feedback control mechanism, and the parameters such as frequency, amplitude and phase are adjusted in real time to minimize the harmonic distortion at the common connection point on the system side. During the adjustment process, the feedback control system dynamically calculates and corrects the compensation information to ensure the maximum compensation effect;

[0008] It is determined whether the harmonic index at the public connection point of the power grid meets the requirements. If so, the current operating parameters are maintained and the operation continues. If not, the execution step is returned to continue to optimize the compensation signal until the harmonic distortion is effectively suppressed.

[0009] As a specific solution of the technical solution of the present application, the rapid adjustment includes dynamically adjusting the output frequency, amplitude and phase of the harmonic source, quickly capturing harmonic changes through an ultra-short period feedback mechanism, and correcting the compensation strategy in real time to ensure that the harmonic suppression achieves the best effect.

[0010] As a specific solution of the technical solution of the present application, the harmonic source is a source with a high response speed, and a fast adjustment algorithm is used to achieve harmonic compensation to ensure an extremely short response time, so as to achieve rapid suppression of harmonic signals.

[0011] As a specific solution of the technical solution of the present application, the generation of the compensation signal is based on the joint analysis of the time domain and the frequency domain, and the harmonic components are analyzed in real time through fast Fourier transform (FFT) or wavelet transform, and a compensation signal matching it is generated.

[0012] As a specific solution of the technical solution of the present application, the amplitude and phase adjustment of the compensation signal are corrected in real time through an ultra-short feedback algorithm to ensure real-time suppression of the amplitude of each order of harmonics and rapid adjustment of the compensation frequency to minimize the harmonic distortion on the grid side.

[0013] As a specific solution of the technical solution of the present application, the ultra-short feedback algorithm is based on a dynamic adaptive model. It quickly responds to changes in grid load by adjusting control gain and optimizing feedback path, and continuously tracks real-time harmonic waveforms to ensure that the compensation effect is delay-free.

[0014] As a specific solution of the technical solution of the present application, the device includes a digital signal processing unit and a feedback control module. The digital signal processing unit collects power grid signals in real time, and feeds back to the feedback control module after rapid calculation to control the harmonic source for compensation adjustment.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This harmonic compensation method based on the ultra-short feedback control mechanism uses the ultra-short feedback control mechanism to quickly respond to harmonic changes, and calculates the corresponding compensation signal according to the real-time detected harmonic frequency and amplitude, and dynamically adjusts the output frequency, amplitude and phase of the harmonic source to perform compensation. At the same time, through the dynamic adaptive model and ultra-short feedback algorithm, the amplitude and phase of the compensation signal are corrected in real time to minimize the harmonic distortion on the grid side. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0019] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0020] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0021] It should be noted that like reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not require further detailed discussion and description in the description of the subsequent drawings.

[0022] like Figure 1 As shown, the present invention provides a technical solution: a harmonic compensation method based on an ultra-short feedback control mechanism, the method is applied to a harmonic compensation device, the device includes a harmonic source, the harmonic source is connected to a power grid, and the method includes the following steps:

[0023] Real-time detection of harmonic signals at the common connection point of the power grid, rapid response to the detected harmonic waveform through an ultra-short feedback control mechanism, and judgment of whether compensation is required based on the feedback information. If compensation is not required, the harmonic source is turned off. If compensation is required, proceed to the next step. It should be clear that in this application, high-precision power quality monitoring equipment is installed at the common connection point of the power grid. These equipment generally include current transformers and voltage transformers for capturing current and voltage waveforms in the power grid. Monitoring equipment with high-speed sampling rate and high resolution is selected to ensure that harmonic signals, especially high-order harmonics, can be accurately captured. The monitoring equipment is used to collect current and voltage data in real time and transmit them to the data processing unit. The collected data is pre-processed, including filtering, denoising, etc., to improve the accuracy of subsequent analysis.

[0024] According to the harmonic signal detected in real time, the harmonic frequency and amplitude are quickly determined. Based on this information, the frequency and amplitude of the compensation signal are calculated, and the harmonics are quickly adjusted accordingly. High-precision current and voltage sensors are used to sample the current and voltage waveforms in real time at the common connection point (PCC) of the power grid. The sampling frequency should be high enough to ensure that all harmonic components of interest, especially high-order harmonics, can be captured. The sampled data is preprocessed, such as filtering and denoising, to improve the accuracy of subsequent analysis. Fast Fourier transform (FFT) or other advanced signal processing algorithms are used to perform spectral analysis on the preprocessed data to extract the frequency and amplitude of each harmonic. The time domain signal is converted into a frequency domain signal through the FFT algorithm to obtain a spectrum diagram. On the spectrum diagram, the frequency and corresponding amplitude of each harmonic can be clearly seen. The compensation strategy is designed based on the extracted harmonic information. The goal of the compensation strategy is to generate a compensation signal with an opposite phase and equal amplitude to the harmonic signal to offset the impact of harmonics on the power grid. For each harmonic that needs to be compensated, the frequency and amplitude of the compensation signal are calculated based on its frequency and amplitude. The frequency of the compensation signal should be the same as the frequency of the harmonic signal, and the amplitude should be equal to the amplitude of the harmonic signal but opposite in phase. Digital signal processing (DSP) technology or dedicated harmonic compensation equipment is used to generate a compensation signal in real time based on the calculated compensation signal parameters, and the generated compensation signal is injected into the power grid through an appropriate circuit to offset the harmonic signal. The selection of the injection point should ensure that the compensation signal can effectively interact with the harmonic signal to achieve the best compensation effect. After the compensation signal is injected, the harmonic condition of the power grid is continuously monitored. According to the monitoring results, the parameters of the compensation signal are adjusted in real time to ensure that the compensation effect is always maintained in the best state.

[0025] The output signal of the harmonic source is adjusted through the ultra-short feedback control mechanism, and the parameters such as frequency, amplitude and phase are adjusted in real time to minimize the harmonic distortion at the common connection point on the system side. During the adjustment process, the feedback control system dynamically calculates and corrects the compensation information to ensure the maximum compensation effect. High-precision current and voltage sensors are installed at the common connection point (PCC) of the power grid to capture the current and voltage waveforms in the power grid in real time. The sensor should have high bandwidth, high resolution and low noise characteristics to ensure the accuracy and reliability of the data. The current and voltage data output by the sensor are collected in real time using a high-speed data acquisition system. The collected data is preprocessed, including filtering, denoising and calibration, to improve the accuracy of subsequent analysis. Fast Fourier transform (FFT) or other advanced signal processing algorithms are used to perform spectrum analysis on the preprocessed data to extract the frequency, amplitude and phase information of each harmonic. The analysis results should be able to accurately reflect the harmonic conditions in the power grid, including the distribution, amplitude and phase relationship of the harmonics. Based on the harmonic analysis results, the required compensation signal parameters are dynamically calculated, including the frequency, amplitude and phase of the compensation signal. The design goal of the compensation signal is to generate a signal with opposite phase and equal amplitude to the harmonic signal to offset the impact of harmonics on the power grid. The compensation information calculated by the control algorithm is used to adjust the output signal parameters of the harmonic source, including frequency, amplitude and phase, in real time. The adjustment process should ensure that the output signal of the harmonic source is opposite in phase and equal in amplitude to the harmonic signal in the power grid, so as to achieve effective harmonic cancellation. At the same time, the feedback control system should continuously monitor the harmonic status of the power grid and correct the compensation information in real time according to the monitoring results to further improve the compensation effect. Through the above steps, the ultra-short feedback control mechanism can be used to achieve precise control of the harmonic source, and its output signal parameters can be adjusted in real time to minimize the harmonic distortion at the common connection point on the system side. This process not only improves the power quality of the power grid, but also reduces the potential damage of harmonics to power grid equipment and loads, ensuring the safe, stable and efficient operation of the power grid.

[0026] It is determined whether the harmonic index at the public connection point of the power grid meets the requirements. If so, the current operating parameters are maintained and the operation continues. If not, the execution step is returned to continue to optimize the compensation signal until the harmonic distortion is effectively suppressed.

[0027] Rapid regulation includes dynamic adjustment of the output frequency, amplitude and phase of the harmonic source, quickly capturing harmonic changes through an ultra-short cycle feedback mechanism, and correcting the compensation strategy in real time to ensure that the best harmonic suppression effect is achieved.

[0028] The harmonic source is a source with a high response speed, and a fast adjustment algorithm is used to achieve harmonic compensation, ensuring an extremely short response time to achieve rapid suppression of harmonic signals.

[0029] The generation of compensation signals is based on the joint analysis of time domain and frequency domain. The harmonic components are analyzed in real time through fast Fourier transform (FFT) or wavelet transform, and the matching compensation signals are generated.

[0030] The amplitude and phase adjustment of the compensation signal are corrected in real time through an ultra-short feedback algorithm to ensure real-time suppression of the amplitude of each order of harmonics and rapid adjustment of the compensation frequency to minimize harmonic distortion on the grid side.

[0031] The ultra-short feedback algorithm is based on a dynamic adaptive model. It quickly responds to grid load changes by adjusting control gains and optimizing feedback paths, and continuously tracks real-time harmonic waveforms to ensure that the compensation effect is delay-free.

[0032] The device includes a digital signal processing unit and a feedback control module. The digital signal processing unit collects power grid signals in real time, and feeds back to the feedback control module after rapid calculation to control the harmonic source for compensation adjustment.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the attached embodiments and their equivalents.

Claims

1. A harmonic compensation method based on an ultra-short feedback control mechanism, characterized in that: The method is applied to a harmonic compensation device, the device includes a harmonic source, the harmonic source is connected to a power grid, and the method includes the following steps: Real-time detection of harmonic signals at the public connection point of the power grid, rapid response to the detected harmonic waveform through the ultra-short feedback control mechanism, and judgment on whether compensation is needed based on the feedback information. If compensation is not needed, the harmonic source is turned off; if compensation is needed, proceed to the next step; According to the harmonic signal detected in real time, the harmonic frequency and amplitude are quickly determined. Based on this information, the frequency and amplitude of the compensation signal are calculated, and the harmonics are quickly adjusted accordingly; The output signal of the harmonic source is adjusted through the ultra-short feedback control mechanism, and the parameters such as frequency, amplitude and phase are adjusted in real time to minimize the harmonic distortion at the common connection point on the system side. During the adjustment process, the feedback control system dynamically calculates and corrects the compensation information to ensure the maximum compensation effect; It is determined whether the harmonic index at the public connection point of the power grid meets the requirements. If so, the current operating parameters are maintained and the operation continues. If not, the execution step is returned to continue optimizing the compensation signal until the harmonic distortion is effectively suppressed.

2. The harmonic compensation method based on the ultra-short feedback control mechanism according to claim 1 is characterized in that: The rapid regulation includes dynamically adjusting the output frequency, amplitude and phase of the harmonic source, quickly capturing harmonic changes through an ultra-short cycle feedback mechanism, and correcting the compensation strategy in real time to ensure that the harmonic suppression achieves the best effect.

3. The harmonic compensation method based on ultra-short feedback control mechanism according to claim 1 is characterized in that: The harmonic source is a source with a high response speed, and a fast adjustment algorithm is used to achieve harmonic compensation, ensuring an extremely short response time to achieve rapid suppression of harmonic signals.

4. The harmonic compensation method based on ultra-short feedback control mechanism according to claim 1 is characterized in that: The generation of the compensation signal is based on the joint analysis of the time domain and the frequency domain. The harmonic components are analyzed in real time through fast Fourier transform (FFT) or wavelet transform, and a compensation signal matching the harmonic components is generated.

5. The harmonic compensation method based on ultra-short feedback control mechanism according to claim 1 is characterized in that: The amplitude and phase adjustment of the compensation signal are corrected in real time through an ultra-short feedback algorithm, ensuring real-time suppression of the amplitude of each order of harmonics and rapid adjustment of the compensation frequency to minimize grid-side harmonic distortion.

6. The harmonic compensation method based on ultra-short feedback control mechanism according to claim 1 is characterized in that: The ultra-short feedback algorithm is based on a dynamic adaptive model. It quickly responds to grid load changes by adjusting control gain and optimizing feedback paths, and continuously tracks real-time harmonic waveforms to ensure that the compensation effect is delay-free.

7. The harmonic compensation method based on ultra-short feedback control mechanism according to claim 1 is characterized in that: The device comprises a digital signal processing unit and a feedback control module. The digital signal processing unit collects power grid signals in real time, and feeds back signals to the feedback control module after rapid calculation, so as to control the harmonic source for compensation adjustment.

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