组合保护下双馈风力发电机组低电压穿越能力的分析

Simulation and Analysis of Low Voltage Ride Through Capability of Doubly Fed Induction Generation with Combined Protection Strategy

提出了一种基于发电机转子侧Crowbar电路和变流器直流侧Chopper电路共同作用的组合式保护控制策略。借助PSCAD/EMTDC仿真软件,搭建双馈风力发电机组系统仿真模型。针对电网三相对称短路故障,进行上述组合式保护控制策略的仿真研究和验证。仿真结果显示,在这种组合式保护控制策略的作用下,双馈风力发电机实现了电网电压深度跌落时的低电压穿越。

This paper presented a new method, combined protection and control strategy which is based on Chopper circuit and Crowbar circuit. The simulation and analysis were performed by using PSCAD/EMTDC. The simulation model of doubly fed induction generation （DFIG） was established to observe the operating characteristics of new combined protection and control strategy during symmetrical short circuit faults on the grid side. The simulation results show that the DFIG equipped with the new combined protection and control strategy can achieve tremendous low voltage ride through capability during heavy grid faults.