The research on Optimization Design of DFIG Crowbar
A widely used method to realize LVRT is adding a crowbar circuit to the DFIG, however, the choice of crowbar resistance is difficult and it has a key influence on LVRT during the grid faults.In recent years, there have been many studies on the choice of crowbar resistance, however, these studies generally give a broad resistance choice scope, and the designer can only choose the crowbar resistance by trial and error method to get a better LVRT process, hence, the efficiency is not high.In this paper, a crowbar resistance design method based on fuzzy membership function is proposed, it can improve the design efficiency of crowbar circuit greatly and achieve a higher degree of satisfaction during LVRT process.This paper analyzes the change process of stator and rotor fault current, obtains the constraints relation of crowbar resistance with rotor side current and DC-link voltage.Then, transform the crowbar resistance constraint equations into the fuzzy membership function.Finally,establish a DFIG model with Crowbar circuit on the Matlab simulation software platform.The simulation results verify that this crowbar resistance design method can get the satisfied result on the maximum balance and improve the efficiency of selection of the crowbar resistance greatly.
Crowbar DFIG Fuzzy Membership LVRT
Jun Chen Xiaofu Xiong Rui Yu Chao Xiao Jinxin Ouyang Yu Chen
State Grid Sichuan Electric Company, Chengdu, 610041China State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing
国际会议
南京
英文
420-424
2015-09-21（万方平台首次上网日期，不代表论文的发表时间）