﻿ 双馈型风电场并网短路电流特性研究

# 双馈型风电场并网短路电流特性研究Research on Characteristics of Short-Circuit Current of DFIG Based Wind Farm

Abstract: Wind farms consisting mainly of doubly-fed induction generators occupy more and more proportion in power supply. There do exist big differences of output short-circuit current characteristic between the doubly-fed induction generator and the synchronous generator. Research about the fault transient analysis of doubly-fed induction generators has become a hotspot; however, current research mainly focuses on the grid-connected system with single generator. This paper analyzes the short-circuit transient process of single doubly-fed induction generator in complex frequency domain and establishes the equivalent circuits of fundamental frequency, DC and rotor- speed frequency components in transient process respectively to study the changing regularity of short-circuit current of doubly-fed wind farms. Then this paper deduces the expression of short- circuit current increment of single generator in wind farm, and based on this, this paper further uses the improved weighted method to deduce the calculation formula of doubly-fed wind farm. Accuracy of the changing regularity of short-circuit current and the calculation formula is verified through simulation.

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