Distributed power source power distribution network electric energy quality disturbance detection method based on VMD and DFA

A technology of power quality disturbance and distributed power supply, applied in the direction of measuring electrical variables, measuring electricity, electrical components, etc., can solve difficult problems such as PQ interference data analysis and monitoring, achieve good classification effect, save training time, and simple classification method Effect

Active Publication Date: 2019-04-16
CHINA THREE GORGES UNIV
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Problems solved by technology

In complex power systems, it is difficult to analyz

Method used

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  • Distributed power source power distribution network electric energy quality disturbance detection method based on VMD and DFA
  • Distributed power source power distribution network electric energy quality disturbance detection method based on VMD and DFA
  • Distributed power source power distribution network electric energy quality disturbance detection method based on VMD and DFA

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Embodiment Construction

[0024] The detection method of power quality disturbance in distribution network with distributed generation based on VMD and DFA includes the following steps:

[0025] Step 1: Build a distribution network system including photovoltaic and wind energy as a test system for testing the effectiveness of the algorithm;

[0026] Step 2: Use variational mode decomposition VMD to decompose the disturbance signal, filter out the noise in the disturbance signal, and decompose to obtain the band-limited intrinsic mode function BLIMF containing characteristic information;

[0027] Step 3: Use the band-limited intrinsic mode function BLIMF containing characteristic information as the input signal of the DFA algorithm;

[0028] Step 4: Use the DFA algorithm to perform long-range power-law analysis on each band-limited intrinsic mode function BLIMF containing characteristic information, and describe the log-logarithmic coordinate curve of the wave function F(s) changing with the window size...

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Abstract

The invention relates to a distributed power source power distribution network electric energy quality disturbance detection method based on VMD and DFA. The method comprises the following steps thata test system which is provided with a power distribution network system used for testing the effectiveness of an algorithm; disturbance signals are decomposed by adopting a variational modal decomposition VMD to obtain a band-limited inherent mode function BLIMF comprising feature information; a band-limited inherent mode function BLIMF comprising feature information is used as an input signal ofa DFA algorithm; long-range power law analysis is made on the band-limited inherent mode function BLIMF containing feature information by utilizing the DFA algorithm, and a double-logarithm coordinate curve with the fluctuation function changing along with the size of a window is depicted; the window with three sizes is arranged, the disturbance signals with different frequency changes are tracked, and the characteristic quantities of all kinds of disturbance signals under three windows are obtained; the characteristic values of each disturbance signal are obtained, and the characteristic values are used as an electric energy quality classification standard; and a judgment standard for the fault state of the power distribution network containing the distributed energy sources is provided.According to the method, the steps are simple, the classification is accurate, the robustness is achieved, and the reliability of the power distribution network can be improved.

Description

technical field [0001] The invention relates to the technical field of detection and classification of power quality disturbance signals, in particular to a method for detecting power quality disturbances in distribution networks containing distributed power sources based on VMD and DFA. Background technique [0002] At present, power quality monitoring has become an important part of protecting electrical and electronic equipment and identifying the cause of interference. With the deepening of the grid sustainable development goals, more and more renewable energy and distributed power are integrated into the distribution grid. Due to the randomness and intermittent nature of distributed power, the power quality disturbance signal generated when a large number of integrations have certain characteristics. Power electronic equipment in power distribution system as grid interface, solid-state switching devices, nonlinear loads, rectifiers and inverters, relay protection devic...

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Application Information

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IPC IPC(8): G01R31/08H02J3/00
CPCG01R31/086G01R31/088H02J3/00H02J2203/20
Inventor 徐艳春高永康李振兴李振华
Owner CHINA THREE GORGES UNIV
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