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A method and device for real-time extraction of multi-inverter grid-connected oscillation characteristics

A multi-inverter and extraction method technology, applied in the direction of measuring devices, instruments, fault locations, etc., can solve the problems of inaccuracy, high-frequency oscillation extraction is not fast enough, etc., to reduce detection, highlight substantive features, and broad application prospects Effect

Active Publication Date: 2021-10-01
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the high-frequency oscillation varies greatly within one fundamental wave period, the extraction of high-frequency oscillation is not fast enough and not accurate enough, the present invention provides a method for real-time extraction of multi-inverter grid-connected oscillation characteristics

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  • A method and device for real-time extraction of multi-inverter grid-connected oscillation characteristics
  • A method and device for real-time extraction of multi-inverter grid-connected oscillation characteristics
  • A method and device for real-time extraction of multi-inverter grid-connected oscillation characteristics

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Embodiment 1

[0063] Such as figure 1 As shown, the technical solution of the present invention provides a method for real-time extraction of multi-inverter grid-connected oscillation characteristics, including the following steps:

[0064] S1: According to the multi-inverter grid-connected coupling resonance mechanism and the resonance mechanism analysis in the active damping optimization method, obtain the frequency bands where all possible resonance frequencies are located;

[0065] S2: Collect the signal to be detected, and decompose the signal to be detected into signals of different frequency bands through wavelet transform; extract all frequency bands of frequencies that may oscillate and decompose them into small frequency bands; in this step, the existence of oscillations analyzed in step S1 Frequency band, to determine the number of decomposition layers of wavelet transform;

[0066] S3: judge whether the frequency band oscillates according to the threshold value of each small fr...

Embodiment 2

[0083] The technical solution of the present invention provides a real-time extraction device for multi-inverter grid-connected oscillation characteristics, including an acquisition processing module, a small frequency band decomposition module, an oscillation judgment module, and a calculation processing module;

[0084] The collection and processing module is used to collect the signal to be detected, and decompose the signal to be detected into signals of different frequency bands through wavelet transform;

[0085] The small frequency band decomposition module is used to extract the frequency bands of all possible oscillation frequencies and decompose them into small frequency bands;

[0086] An oscillation judging module, configured to judge whether the frequency band oscillates according to the threshold of each small frequency band;

[0087] The computing processing module is used to analyze the small frequency band containing the oscillating signal by using an algorith...

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Abstract

The present invention provides a method and device for real-time extraction of multi-inverter grid-connected oscillation characteristics, including the following steps: S1: Acquire all possible occurrences according to the multi-inverter grid-connected coupling resonance mechanism and the resonance mechanism analysis in the active damping optimization method The frequency band where the resonant frequency is located; S2: collect the signal to be detected, and decompose the signal to be detected into signals of different frequency bands by wavelet transform; extract the frequency bands of all possible oscillation frequencies and decompose them into small frequency bands; in this step, through the steps The vibrations analyzed in S1 exist in the frequency band, and the number of decomposition layers of the wavelet transform is determined; S3: According to the threshold of each small frequency band, it is judged whether the frequency band has oscillation; S4: Using the algorithm to analyze the small frequency band containing the oscillation signal to obtain the amplitude and frequency.

Description

technical field [0001] The invention relates to the technical field of multi-inverter grid-connected power generation systems, and in particular to a method and device for real-time extraction of multi-inverter grid-connected oscillation characteristics. Background technique [0002] In the multi-inverter grid-connected power generation system, due to the interactive coupling phenomenon between multiple grid-connected inverters and between the inverter and the grid, it is easy to cause oscillation. And in the multi-inverter grid-connected power generation system, oscillations (oscillation points) may occur at many frequencies, and the oscillation frequency of some oscillation points will change with the number of grid-connected inverters. During the oscillation process, the amplitude of the voltage and current at the oscillation frequency will increase continuously, which will eventually lead to the collapse of the system. We hope to be able to detect the characteristics of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 马帅武志刚彭静王志涛李婧桑敏李凯陈敬娟刘炳琪尹新明尉龙石良解江胜张春美任杰许一丹王新娇冀文瑞
Owner STATE GRID SHANDONG ELECTRIC POWER