Responsibility quantification method for multi-harmonic sources based on independent component analysis

Abstract

The invention discloses a multi-harmonic source responsibility quantification method based on independent component analysis, which includes the following steps: S1: implement synchronous measurement on the bus bar connected to the suspicious harmonic source and the concerned bus bar and obtain voltage and current measurement data, and perform Fu on the measurement data Liye decomposition to obtain the harmonic voltage and current data; S2: according to step S1, a certain harmonic voltage and current data is used as the observation signal, and the source signal and the mixing matrix are solved by the independent component analysis method; S3: repeat step S2, calculate Each suspicious harmonic source pays attention to the harmonic voltage emission level of the busbar and quantifies its responsibility. The present invention utilizes the certainty of the product of the mixing matrix and the estimated signal value of the suspicious harmonic source in the independent component analysis method to directly solve the responsibility of each suspicious harmonic source without calculating the transfer impedance of each suspicious harmonic source to the concerned bus, reducing calculation errors, And no matter how many suspicious harmonic sources there are, only one independent component analysis method is used to solve the problem, reducing the amount of calculation and avoiding the cumulative effect of errors.

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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