基于转子串电阻的双馈风电机组的故障穿越方法研究  

Analysis of Fault Ride-through of Doubly-fed Wind Power Generator Based on Rotor Series Resistor

作　　者：孟娜娜[1] 孙丽玲[1] 

机构地区：[1]华北电力大学电气工程学院,河北保定071003

出　　处：《现代电力》2017年第3期19-24,共6页Modern Electric Power

摘　　要：电网发生故障时,Crowbar保护电路的投入会将双馈风电机的转子侧变换器短路从而使其失去控制,而且变换器的传统控制方法会导致双馈风电机组的控制性能恶化。针对以上问题,本文在考虑定子励磁电流动态变化的基础上改进了变换器的控制策略,并与转子串电阻相互配合,实现了双馈风电机组的故障穿越方法。利用MATLAB/Simulink仿真平台进行了仿真实验,结果表明,改进的控制策略与转子串电阻相互配合能够协助双馈风电机组成功穿越电网的严重故障,有利于风电系统的稳定运行。In the case of power grid failure, the rotor side converter of double fed wind generator will be shorted when Crowbar protection circuit is put into, which results in the out of control of doubly fed wind power generator. Then the traditional control method of converter will lead to the dete- rioration of control performance of doubly fed wind genera- tor. As to above problems, this paper improves converter control strategy by considering the dynamic changes of the stator excitation current, and proposes fault ride-through scheme by combining with rotor series resistor. The pro- posed scheme is analYzed and its superiority is verified through Matlab/Simulink software. Simulation results show that the improved control strategy coordinating with rotor series resistor method can help doubly fed generator ride through the serious fault of the power grid, which is conducive fo the operation stability of the wind power system.

关 键 词：双馈风电机 定子励磁电流 变换器 故障穿越 转子串电阻 

分 类 号：TM61[电气工程—电力系统及自动化]