Multi-harmonic source responsibility quantification method based on independent component analysis

Abstract

The invention discloses a multi-harmonic source responsibility quantification method based on independent component analysis. The method comprises the following steps of S1, performing synchronous measurement on a bus and an attention bus connected with a suspicious harmonic source to obtain voltage and current measurement data, and performing fourier decomposition on the measurement data to obtain harmonic voltage and current data of each order; S2, according to the step S1, taking a certain order of harmonic voltage and current data as observation signals, and solving a source signal and a mixed matrix by using an independent component analysis method; and S3, repeating the step S2, and calculating the harmonic voltage emission levels of all the suspicious harmonic sources on the attention bus and quantizing the responsibility. According to the method, based on the certainty of the product of the mixed matrix and the suspicious harmonic source signal estimated value by virtue of theindependent component analysis method, the responsibility of each suspicious harmonic source is directly solved, the transfer impedance of each suspicious harmonic source to the attention bus is not required to be calculated, and the calculation error is reduced; and no matter how many suspicious harmonic sources exist, only one time of independent component analysis method is carried out for solving, the calculation amount is reduced, and the error accumulation effect is avoided.

Description

technical field [0001] The invention relates to the technical field of multi-harmonic source responsibility quantification, in particular to a multi-harmonic source responsibility quantification method based on independent component analysis. Background technique [0002] The quantitative assessment of harmonic responsibility is the premise of harmonic governance. A large number of scholars have proposed many solutions to the problem of quantifying the harmonic responsibility of a Point of Common Coupling (PCC). However, in recent years, with the large-scale grid-connection of high-penetration renewable energy, the gradual increase of multi-feed DC drop points, and the continuous increase of non-linear users such as high-speed rail, urban rail transit, and electric vehicle charging piles, the The number, distribution and harmonic content of harmonic sources are increasing, harmonic pollution and harm are becoming more and more serious, and power grid accidents caused by har...

AI Technical Summary

Problems solved by technology

However, in recent years, with the large-scale grid-connection of high-penetration renewable energy, the gradual increase of multi-feed DC drop points, and the continuous increase of non-linear users such as high-speed rail, urban rail transit, and electric vehicle charging piles, the The number, distribution and harmonic content of harmonic sources are increasing, harmonic pollution and harm are becoming more and more serious, and power grid accidents caused by harmonic resonance and amplification occur from time to time

The existing harmonic liability quantification technology based on single PCC point measurement only considers the overall responsibility of all harmonic sources on both sides of the PCC point (system side and user side), and cannot clarify the different harmonic sources on both sides. It is not enough to determine the respective responsibilities of multiple suspicious harmonic sources and analyze the possibility of network harmonic current distribution and harmonic resonance

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