A Method for Locating Characteristic Harmonic Sources of pcc Points
A positioning method and harmonic source technology, applied in spectrum analysis/Fourier analysis, etc., can solve the problem of imprecise theory of qualitative analysis method, and achieve the effect of stable engineering application, rigorous theory, and convenient engineering application
Active Publication Date: 2020-11-10
江苏中凌高科技股份有限公司
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[0019] The purpose of the present invention is to provide a method for locating the characteristic harmonic source of the PCC point, which overcomes the defect that the existing qualitative analysis method is not rigorous in theory, and can analyze and judge without accurate harmonic impedance, which is convenient for engineering application
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[0058] The present invention will be further described below in conjunction with the accompanying drawings and a certain 220KV substation PCC point harmonic source location embodiment, as figure 1 As shown, a PCC point characteristic harmonic source location method is carried out according to the following steps:
[0059] Step S1, constructing the Thevenin equivalent circuit schematic diagram of the power system harmonic source of the public power grid.
[0060] According to the Thevenin equivalent circuit of the system user identified by the harmonic source, the h-order harmonic active power P and reactive power Q at the PCC point are deduced as
[0061]
[0062]
[0063] Among them, E u is the equivalent harmonic source electromotive force amplitude on the system side, R u and x u is the system side equivalent harmonic resistance and reactance, E c is the load-side equivalent harmonic source electromotive force amplitude, R c and x c is the equivalent harmonic re...
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The invention provides a characteristic harmonic wave source positioning method for a PCC (Point of Common Coupling). The method is a qualitative analysis method which comprises the following steps that: on the basis of a Thevenin equivalent circuit identified by a harmonic wave source, through mathematical derivation, obtaining a function relationship among the harmonic wave active power, the harmonic wave reactive power and the harmonic wave source parameter of the PCC, and exporting six sufficient conditions for PCC harmonic wave source positioning and one sufficient condition for PCC primary harmonic wave source positioning; therefore, according to a harmonic wave current spectrogram, determining characteristic harmonic wave, when harmonic wave source positioning is carried out, temporarily cutting off all power factor compensation capacitors, and obtaining the equivalent harmonic wave impedance parameters of the system side and the load side of the characteristic harmonic wave ofthe PCC; and finally, according to the active power reactive tendency chart of the characteristic harmonic wave, utilizing seven sufficient conditions to realize the harmonic wave source positioning of the PCC. By use of the method, the defect that theory of an existing qualitative analysis method is not rigorous is overcome, the characteristic harmonic wave source can be positioned without accurate harmonic wave impedance, and convenience is brought to engineering application.
Description
technical field [0001] The invention relates to the technical field of harmonic pollution control and harmonic source positioning, in particular to a characteristic harmonic source positioning method of a PCC point. Background technique [0002] Due to the large-scale connection of nonlinear loads to the power grid, a large number of harmonics are injected into the public power grid, which has caused a huge impact on the power grid and users. In order to realize the accurate division of harmonic responsibilities, and then effectively control the harmonic pollution, it is necessary to accurately locate the harmonic source. [0003] Harmonic source location can be divided into two situations: one is PCC point harmonic source location and main harmonic source location; the other is to use the harmonic state estimation method for the entire system network to calculate the harmonics of each node in the system. The wave voltage and the harmonic current of the branch can be used t...
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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 麻刚王柏林张海江熊杰锋
Owner 江苏中凌高科技股份有限公司