双馈异步风电系统的建模仿真

Modeling and Simulation of Doubly Fed Induction Generator

当电网电压跌落时,风电机组须维持一定时间与电网连接而不解列,并且能提供无功以支持电网电压的恢复,即具有低电压穿越能力,而双馈风电机组低电压穿越能力最弱。分析建立了双馈风力发电机组的模型,通过使用MATLAB/SIMULINK仿真,来研究它的LVRT性能,及影响它LVRT性能的因素,探讨它的改进方案。

When grid voltage drops down, wind turbines must maintain connection with power grid for a certain time, not disconnection, and can provide reactive power to support the recovery of voltage, namely have Low Voltage Ride Through （LVRT） capability. Doubly fed induction generator （DFIG） has lowest voltage ride through capability. This paper builds the model of DFIG, studies the LVRT capability, analyzes the facts affecting the LVRT capability by MATLAB/SIMULINK simulation, and discusses the ways to improve it.