不对称电网故障下双馈风电机组低电压穿越方案比较研究  

Comparative study of low voltage ride-through techniques for doubly-fed induction generator wind turbines under asymmetrical grid faults

作　　者：李辉[1] 廖勇[1] 姚骏[1] 刘刃[1] 

机构地区：[1]重庆大学配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《重庆大学学报（自然科学版）》2011年第11期77-86,共10页Journal of Chongqing University

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA05Z422);重庆市科技计划攻关资助项目(CSTC2008AB3047)

摘　　要：相比于对称电网故障,不对称电网故障在实际电力系统运行中发生的概率更大,其对双馈风电机组(DFIG)的'有害'影响也更大。首先分析了不对称电网故障下双馈风电机组的瞬态特性,继而结合仿真,研究了双馈风电机组各种低电压穿越(LVRT)技术方案在严重不对称电网故障下的运行特性。在此基础之上,对不同的低电压穿越方案进行了深入分析研究,阐述了其运行特点,并进一步探讨了各种低电压穿越方案的经济性,为工程实现各种低电压穿越方案奠定基础。Asymmetrical grid faults occur more frequently and have more adverse effects on the doubly fed induction generator（DFIG） than symmetrical grid faults in the transmission system.The transient response of DFIG under asymmetrical grid faults is analyzed firstly.Meanwhile,operation behaviors of several low voltage ride-through（LVRT） techniques under severe asymmetrical grid faults are given by simulation with the Matlab/Simulink software.Then the characteristics of these LVRT techniques are further researched and analyzed based on the simulation results.Finally,the economies of these LVRT techniques are discussed.The conclusion lays a certain foundation for engineering development of these LVRT techniques.

关 键 词：风力发电 风力机 严重不对称电网故障 低电压穿越 双馈感应发电机 串联网侧变换器 

分 类 号：TM614[电气工程—电力系统及自动化] TM761