双馈风力发电系统低电压穿越的研究

Study on the Low Voltage Ride Through Technology of Double-fed Wind Power Generation

针对双馈型变速恒频风力发电系统的低电压穿越问题,提出一种新颖的转子侧保护电路。在建立电机的稳态和暂态数学模型的基础上,分析了电网电压发生跌落期间以及电压恢复后的双馈感应发电机的动态响应情况。仿真结果表明,在电压跌落时转子侧加入本文设计的Crowbar电路,能够有效抑制直流侧在电压跌落时电容电压的升高,并能减弱转子侧电流大小,起到保护转子侧变流器的作用。

In this paper,a new rotor protection circuit is disigned to deal with the problom of Low Voltage Ride Through of Double-fed Wind Power Generation.Based on establishment of steady state and transient motor mathematical model,the response of DFIG have been analysed during and after the power grid voltage drop occurs.Simulation results show that the DC capacitor voltage has been effectively supressed with Crowbar circuit,In the same time,the rotor RMS currrent has been reduced,so the rotor side confer aer effectively protected.