双馈异步风力发电系统Crowbar保护研究

目前，基于双馈异步发电机（DFIG）的风力发电系统，已被当前的风电工业界所广泛接受。为了满足新的入网规程的要求，必须对电网电压跌落期间双馈异步发电机的低电压穿越能力进行研究。本文首先分析了电网电压跌落的情况下DFIG的瞬态特性．继而总结、评价了Crowbar保护电路的两种类型，最后指出了影响Crowbar电路保护效果的因素，以期对双馈异步风电系统的低电压保护方案的选择和实现做进一步的探索和研究。

Research on Crowbar Protection for Doubly-fed Induction Wind Power Generation System

At present, the current wind power industry has widely accepted the doubly-fed induction generator wind-power generation system. In order to meet the new access code requirements, it is necessary to study the doubly-fed induction generator of low voltage through ability during grid voltage drop period. This paper first analyzes the transient characteristics of DFIG under grid voltage drop, and then summarize, evaluateon Crowbar two types of circuit protection, and finally pointed out the factors affecting the Crowbar circuit protection effect to the low voltage doubly fed induction wind power system the selection and implementation of protection programs do further exploration and research.