A power distribution network harmonic impedance calculating method based on canonical correlation analysis

A typical correlation and harmonic impedance technology, applied in the direction of impedance measurement, etc., can solve the problems that the impedance accuracy cannot be guaranteed, and achieve the effect of accurate harmonic impedance value

Active Publication Date: 2018-01-12
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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Problems solved by technology

[0004] The present invention aims at the problem that the current method for calculating harmonic impedance cannot guarantee the accuracy of the required impedance, and pr...

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  • A power distribution network harmonic impedance calculating method based on canonical correlation analysis
  • A power distribution network harmonic impedance calculating method based on canonical correlation analysis
  • A power distribution network harmonic impedance calculating method based on canonical correlation analysis

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Embodiment Construction

[0035] Such as figure 1 The flow chart of the distribution network harmonic impedance calculation method based on typical correlation analysis is shown, which specifically includes the following steps:

[0036] 1) Data acquisition, collecting the harmonic voltage at the common connection point PCC and harmonic current Such as figure 2 The Norton equivalent model for the harmonic analysis shown, where, Z u ,Z c , respectively represent grid side current, user (load) side current, grid side impedance, user (load) side impedance; collect the bus voltage instantaneous value V at the common connection point PCC pcc and the instantaneous value of current I injected by the user into the grid pcc , the harmonic voltage can be obtained by Fourier transform and harmonic current

[0037] 2) Using the slip method to find the amount of fluctuation, the harmonic voltage collected in the step 1) and harmonic current Slip processing to get the harmonic voltage fluctuation ...

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Abstract

The invention relates to a power distribution network harmonic impedance calculating method based on canonical correlation analysis. Firstly, a bus voltage instantaneous value at a common connection spot PCC portion where a power grid is connected to a user and an instantaneous value of the current injected by the user into the grid are collected, and a harmonic voltage and a harmonic current canbe obtained through the Fourier transform; then, a fluctuation amount is obtained by using a slip method; the collected harmonic voltage and harmonic current are subjected to slip processing to obtaina harmonic voltage fluctuation amount delta dotted Vpcc and a harmonic current fluctuation amount delta dotted Ipcc; calculating an impedance sample Zpcc; setting the correlation to analyze the convergence condition of the two convergence zones and classifying the impedance sample according to the magnitude of the fundamental current fluctuation at the PCC portion; finally filtering the impedancesamples and using the canonical correlation analysis method to obtain the correlation coefficients of the harmonic voltage fluctuation amount and harmonic current fluctuation amount using canonical correlation analysis method; and according to the size of the correlation coefficients and the judgment conditions, excluding the linearly uncorrelated points, the harmonic impedance on the grid side and the harmonic impedance on the user side can be obtained and the harmonic impedance value can be more accurately estimated.

Description

technical field [0001] The invention relates to a method for evaluating electric power harmonic impedance, in particular to a method for calculating harmonic impedance of distribution network based on typical correlation analysis. Background technique [0002] Facing the increasingly serious problem of power harmonic pollution, how to effectively distinguish the responsibility of harmonic pollution and evaluate the level of harmonic emission has become an urgent problem to be solved in the current power system. In order to accurately distinguish the responsibility for harmonic pollution, it is necessary to evaluate the user harmonic emission level of the point of common connection (PCC). Currently, the Norton equivalent circuit model of the power grid side and the user side is usually used to analyze the user harmonic emission level of the public connection point. Therefore, accurately estimating the system harmonic impedance has become the key to assessing the user's harmon...

Claims

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Application Information

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IPC IPC(8): G01R27/16
Inventor 张鹏潘爱强杨秀刘蓉晖林顺富汤波陈甜甜潘玲罗祾周健凌平唐伟杰曹基华王毅超汤继开吴沣明
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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