Wind power plant current collection line single-phase earth fault positioning method

Abstract

The invention provides a wind power plant current collection line single-phase earth fault positioning method. The method comprises the following steps: training a regression model combining a self-encoding neural network and a random forest model; collecting three-phase voltage phasors of a booster station medium-voltage bus connected to a wind power plant current collection line and the tail end of the current collection line in real time, and three-phase current phasors of the head end and the tail end of the current collection line; calculating zero-sequence voltage phasors of a medium-voltage bus and the tail end of a current collection wire in the booster station and zero-sequence current phasors of the head end and the tail end of the current collection wire; judging whether a single-phase earth fault occurs or not; and if YES, inputting the effective values and phases of the three-phase voltage and the zero-sequence voltage of the booster station medium-voltage bus and the tail end of the current collection line and the effective values and phases of the three-phase current and the zero-sequence current of the head end and the tail end of the current collection line into the trained regression model, and calculating the distance from the fault point to the booster station medium-voltage bus. According to the invention, the problems of inaccurate single-phase earth fault positioning and multiple measuring points of the current collection line in the prior art can be solved.

Description

technical field [0001] The invention relates to the technical field of power line fault location, in particular to a method for location of a single-phase ground fault of a wind farm collection line. Background technique [0002] Under the background of energy crisis and environmental pollution, new energy power generation has attracted much attention, and the installed capacity has been increasing year by year. Wind power, as one of the most rapidly developing forms of new energy power generation, has a growing scale of development. However, most of my country's wind farms are located in grasslands, mountains, deserts, coastal areas and other areas, with complex terrain and harsh environments, and short-circuit faults often occur in the collector lines inside wind farms. Although the line protection can generally act in time, the complex terrain and harsh environment of the wind farm make it difficult to find the location of the fault point after the protection action, and...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for locating a single-phase ground fault of a wind farm collecting line combined with a random forest and

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