Direct current capacitance detection method, apparatus and system for three-phase four-wire power distribution network compensation equipment

Abstract

Embodiments of the invention disclose a direct current capacitance detection method, apparatus and system for three-phase four-wire power distribution network compensation equipment. By means of obtaining a three-phase compensation current instantaneous value and positive electrode and negative electrode direct current voltage instantaneous values of the three-phase four-wire power distribution network compensation equipment, a zero-sequence compensation current amplitude and a direct current voltage deviation fundamental wave amplitude are calculated so as to calculate the direct current capacitance of the three-phase four-wire power distribution network compensation equipment. According to the method, operation stop of the three-phase four-wire power distribution network compensation equipment is not needed; and instead, the direct current capacitance value can be detected in the normal operation process of the three-phase four-wire power distribution network compensation equipment, and the direct current capacitance value of the three-phase four-wire power distribution network compensation equipment can be continuously monitored.

Description

technical field [0001] The present application relates to the field of electric power technology, in particular to a method, device and system for detecting DC capacitance of compensation equipment in a three-phase four-wire distribution network. Background technique [0002] In the three-phase four-wire distribution network, a large number of single-phase power loads and three-phase power loads are mixed, which will easily lead to serious load imbalances in the transmission lines of the distribution network, affecting the output capacity of transformers and transmission line losses, and even in severe cases. Burn out the transformer. In this regard, the industry usually uses switching capacitor banks to deal with the problem of unbalanced load in the three-phase four-wire distribution network. However, switching capacitor banks can only achieve step-by-step regulation, and in the process of capacitor bank switching, it will cause serious impacts on the voltage and current ...

AI Technical Summary

Problems solved by technology

[0005] This application provides a DC capacitance detection method, device and system for three-phase four-wire distribution network compensation equipment to solve the problem that existing monitoring methods will affect the compensation of three-phase four-wire distribution network compensation equipment for three-phase four-wire distribution network problem of effect

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