电网故障时双馈风电机组定子电压特性及影响分析  

An Analysis on Impacts and Characteristics of Stator Voltage of DFIG-based Wind Turbine Generator Under Grid Short Circuit

作　　者：熊小伏[1] 欧阳金鑫[1] 文安[1] 

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

出　　处：《电力系统自动化》2012年第14期143-149,共7页Automation of Electric Power Systems

基　　金：中央高校基本科研业务费专项资金资助项目(CDJXS11150026);重庆大学输配电装备及系统安全与新技术国家重点实验室资助项目(2007DA10512711102,2007DA10512709202,2007DA10512710403)~~

摘　　要：随着以双馈风力发电机为主的风力发电的大规模并网,电网故障期间并网双馈风电机组对电网的影响不断显现,使电网安全稳定运行面临着严峻挑战。为了有效评估双馈风电机组的暂态过程及其对电网的影响,需要掌握电网故障期间双馈发电机机端电压的大小及变化规律。基于双馈发电机的暂态过程,推导了稳态运行以及外部电网三相短路下双馈发电机定子电压的表达式。在此基础上,对双馈发电机定子电压的暂态特性进行了研究,明确了定子电压的影响因素,分析了电网故障时双馈风电机组对电网暂态电压分布的影响。最后通过仿真进一步分析了定子电压的变化规律并验证了推导的正确性。With the large-scale grid connection of doubly-fed induction generator （DFIG） wind turbine generators, their impacts on the main system become more and more significant during system faults. The security and stability of the power system is under threat. To effectively evaluate the transient process and impact of DFIG wind turbine generators, it is important to understand the terminal voltage characteristics. In this paper, the expression of stator voltage under steady-state and three- phase short circuit condition is proposed based on the DFIG transient dynamics. Then the transient characteristics of stator voltage are investigated, and the effects of DFIG wind turbine generators on the main system voltage are studied. The changing patterns of stator voltage during system faults are further analyzed and verified by simulations.

关 键 词：风力发电 双馈感应发电机 三相短路 定子电压 暂态特性 

分 类 号：TM315[电气工程—电机]