Harmonic correlation analysis based electricity system harmonic source recognition device

Abstract

The invention discloses a harmonic correlation analysis based electricity system harmonic source recognition device, and belongs to the technical field of electricity system harmonic analysis and evaluation. The harmonic correlation analysis based electricity system harmonic source recognition device comprises K harmonic parameter measuring units, K synchronous sequence generation units, a harmonic-fundamental wave correlation matrix calculation unit, a harmonic-harmonic correlation matrix calculation unit and a harmonic source recognition unit. The harmonic correlation analysis based electricity system harmonic source recognition device has the advantages that data, such as harmonic impedance, harmonic source parameters and nonlinear load parameters, of an electricity system do not need to be known accurately, and the defects of nonsynchronous monitoring of part of outgoing lines in the prior art are overcome; correlation characteristics of each outgoing line and each variable are disclosed, and accordingly, a brand-new road is opened up for harmonic source recognition of transformer substations.

Description

technical field [0001] The invention belongs to the technical field of power system harmonic analysis and evaluation. Background technique [0002] With the rapid development of the national economy, more and more nonlinear power equipment and nonlinear power loads are connected to the power system. While they bring many favorable factors to the power system, they also bring a lot to the power quality of the power system. Negative effects, such as voltage deviation, voltage fluctuation, harmonic pollution, etc., among which harmonic pollution is the most concerned issue. [0003] In view of the importance of harmonic pollution, harmonic monitoring and harmonic analysis and evaluation have become unprecedentedly active research fields. Harmonic source identification (or location) in harmonic analysis and evaluation is a major international problem. For this reason, Siemens Corporation of Germany List the identification of power grid harmonic sources as a current key research...

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Problems solved by technology

[0008] In addition to the harmonic active power direction method, people have also discussed some other methods of harmonic source identification, such as harmonic reactive power direction method, critical impedance method, nonlinearity method, sensitivity method, state estimation method, neural network method, etc. etc., these methods have their own limitations - so they have not been widely recognized and really applied

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