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Harmonic compensation method for obtaining system harmonic impedance based on improved particle swarm optimization algorithm

A technology for improving particle swarm and harmonic impedance, applied in the field of harmonic compensation, can solve problems such as affecting the algorithm optimization accuracy, and achieve the effect of not easy to crash and error, strong stability and good robustness

Pending Publication Date: 2019-10-08
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

However, the traditional PSO has the disadvantage that it is easy to fall into a local optimum, which affects the optimization accuracy of the algorithm.

Method used

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  • Harmonic compensation method for obtaining system harmonic impedance based on improved particle swarm optimization algorithm
  • Harmonic compensation method for obtaining system harmonic impedance based on improved particle swarm optimization algorithm
  • Harmonic compensation method for obtaining system harmonic impedance based on improved particle swarm optimization algorithm

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Embodiment

[0057] Such as figure 1 It is a schematic flow diagram of the method of the present invention, specifically comprising the following steps:

[0058] 1) Use discrete Fourier analysis to collect harmonic voltage U at PCC PCC with harmonic current data I PCC ;

[0059] 2) Clean the measurement data according to the Raida (Pauta) criterion, if the measurement data X ii satisfy then think X ii Outliers are removed. In the formula, is the data mean, σ is the standard deviation of the data;

[0060] 3) if figure 2 Shown is the Norton equivalent model of the harmonic processing of the method of the present invention, and the fluctuation data of the harmonic voltage and the harmonic current are obtained by using the slip method and

[0061]

[0062]

[0063] In the formula, d represents the set fixed time interval;

[0064] 4) Construct an observation matrix according to the harmonic voltage and harmonic current fluctuations obtained in step 3):

[0065]

[0...

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Abstract

The invention relates to a harmonic compensation method for obtaining system harmonic impedance based on an improved particle swarm optimization algorithm. The harmonic compensation method comprises the following steps: carrying out data cleaning on measurement data of harmonic voltage and current at a point of common coupling (PCC) according to a Pauta criterion, and then sequentially carrying out mean value removal and whitening processing; constructing an independent component analysis (ICA) model by taking measurement data of harmonic voltage and current as observation signals and taking harmonic current of a system side and a user side as source signals, solving a separation matrix by adopting an improved particle swarm algorithm by taking the maximum data negative entropy as an objective function, and separating independent component signals from the measurement data; taking the measurement data as a dependent variable, taking an independent component obtained by demixing as an independent variable, constructing a regression equation, and obtaining a mixing coefficient matrix by using a least square (OLS) method; and obtaining system harmonic impedance according to a corresponding linear relation between the mixing coefficient and the real part and the imaginary part of the system harmonic impedance. Compared with the prior art, the harmonic compensation method has the advantages of high harmonic compensation accuracy and quick calculation.

Description

technical field [0001] The invention relates to the technical field of harmonic compensation, in particular to a harmonic compensation method for obtaining system harmonic impedance based on an improved particle swarm algorithm. Background technique [0002] With the massive access of power electronic equipment and nonlinear loads, the problem of harmonic pollution in distribution network is becoming more and more serious. The division of harmonic responsibilities plays an extremely important role in harmonic control of distribution networks, and the key to accurately realize the quantitative division of harmonic responsibilities lies in how to accurately obtain the system harmonic impedance value. At present, the estimation methods of system harmonic impedance are divided into two categories: "intervention test" and "non-intervention". Among them, the "non-intervention" method has been widely studied and applied because it will not affect the normal operation of the system....

Claims

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Application Information

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IPC IPC(8): G06F17/50G06N3/00G06K9/62G06F17/16
CPCG06N3/006G06F17/16G06F30/367G06F30/20G06F18/2134
Inventor 林顺富颜昕昱刘持涛顾乡
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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