Harmonic source identification method and device, terminal equipment and storage medium

Abstract

The invention discloses a harmonic source identification method and device, terminal equipment and a storage medium. The method comprises the steps of acquiring bus voltage data in a power system andcurrent data of each feeder; performing phase-shift processing on the bus voltage data and the current data of each feeder by a mobile current data window; and performing Fourier transform on the processed bus voltage data and the processed current data of each feeder to obtain a data set; calculating a correlation coefficient and an integral harmonic coefficient of each feeder according to the data set; calculating load linearity of each feeder according to the correlation coefficient and the integral harmonic coefficient of each feeder; and judging a feeder where a main harmonic source is located according to the load linearity of each feeder so as to achieve identification of the harmonic source. By the method, the main harmonic source in the power system can be accurately identified, and the harmonic identification sensitivity is improved.

Description

technical field [0001] The present invention relates to the technical field of power systems, in particular to a harmonic source identification method, device, terminal equipment and storage medium. Background technique [0002] Harmonic distortion caused by nonlinear loads is a common and important power quality problem in power systems, which can lead to power loss and even equipment failure, and has received more and more attention. In order to effectively control the harmonic pollution in the power grid, the IEEE (Institute of Electrical and Electronics Engineers, Institute of Electrical and Electronics Engineers) standard limits the user's harmonic current emission level, and evaluates the harmonic responsibility according to the user's harmonic current emission level. rewards and punishments. Among them, the premise of implementing the reward and punishment scheme is to reasonably and clearly divide the harmonic responsibilities of each harmonic source, and the premis...

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Problems solved by technology

The inventor found in the process of implementing the present invention that when the level of the harmonic current emitted by the harmonic source is low, the calculated correlation coefficient between the current waveform of the harmonic source and the voltage waveform is likely to be different from the current of the linear load. The correlation coefficient between the waveform and the voltage waveform is very similar, so if the harmonic source is divided directly according to the size of the two, it is easy to misjudge the harmonic source as a linear load, which will lead to an error in the identification of the main harmonic source, which can be seen in the harmonic source When the emitted harmonic current level is low, the existing waveform correlation method is less sensitive to identify the harmonic source

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