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Dominant harmonic source localization and harmonicpollution propagation path tracking method

A positioning method and harmonic source technology, applied in the direction of fault location, fault detection according to conductor type, etc., can solve problems such as the implementation resistance of the positioning method

Active Publication Date: 2019-09-10
GUANGXI POWER GRID ELECTRIC POWER RES INST
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Problems solved by technology

However, most of the existing positioning methods based on wide-area measurement need to extract harmonic voltage phasors or current phasors as input, and rely heavily on synchronized phasor measurement devices. Phasor measurement devices are still limited by economic conditions, so the implementation of existing positioning methods is still subject to certain resistance

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  • Dominant harmonic source localization and harmonicpollution propagation path tracking method
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  • Dominant harmonic source localization and harmonicpollution propagation path tracking method

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[0047] In order to better understand the present invention, the following further describes the present invention with reference to the accompanying drawings and specific embodiments:

[0048] The specific parameters of the IEEE14-node distribution network system model used in this example can be found in Tables 1 to 3. The voltage reference is 18kV, the rated power is 100MW, and the system topology is shown in figure 1 Shown. A dominant harmonic current source with an amplitude of 1A and a frequency of 250Hz (5 times the power frequency) is connected to the 12 nodes of the distribution network, and two nodes with an amplitude of 0.25A and frequency 250Hz small amplitude harmonic source to simulate the background harmonics in the distribution network. In order to simulate the influence of noise in the actual project, 30dB is added to the measured voltage data in this embodiment Gaussian white noise. It should be noted that, in actual implementation, the present invention will ...

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Abstract

The invention belongs to the technical field of power system harmonic source localization, and particularly relates to dominant harmonic source localization and a harmonic source pollution propagationpath tracking method. Theharmonic source pollution propagation path tracking method specifically comprises the steps that a harmonic node impedance matrix is formed according to distribution networkparameters and load data, and arraynormalization is conducted to generate an atomic library;whena higher harmonic is detected, measured voltage data of each of the nodes of the distribution network are collected to calculate a harmonic voltage amplitude and to form a harmonic voltage amplitude vector, then an atommost matchedwith theharmonic voltage amplitude vector is found in the atomic library,a weighting coefficient is calculated according to the least squares method, a residual vector is calculated,the search operation is continued for the residual, iterative operation is continued untilan error value is smaller than a threshold value, and the position of a dominant harmonic source can be indicated by using the weighting coefficient;and on this basis, a normalized harmonic positionindication vector is multiplied by the harmonic node impedance matrix to obtain the pollution propagation path of the dominant harmonic source. According to the dominant harmonic source localization and the harmonic source pollution propagation path tracking method, the dispute of harmonic pollution responsibility can be further solved, and the quality management level of power can be improved.

Description

Technical field [0001] The invention belongs to the technical field of power system harmonic source positioning, and specifically relates to a dominant harmonic source positioning and harmonic source pollution propagation path tracking method. Background technique [0002] With the rapid development of technologies such as flexible DC transmission and new energy power generation, in addition to traditional non-linear loads such as electric arc furnaces and electrified railways, more and more power electronic rectifier equipment are connected to the power distribution network, which leads to the power system The problem of harmonic pollution is getting worse. In order to effectively control the harmonic pollution in the power system, ensure the economic operation of the distribution network and the safe power consumption of users, the precise location of the dominant harmonic source and the tracking of the responsibility of harmonic pollution are essential. At present, domestic a...

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 郭敏金庆忍姚知洋楚红波刘路
Owner GUANGXI POWER GRID ELECTRIC POWER RES INST
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