双馈型风力发电系统低电压穿越策略仿真

针对双馈风力发电机组的低电压穿越能力的问题,介绍了风力发电在电网电压跌落时的并网要求,分析了目前已有的各种应对策略,提出了一套应对电网电压跌落时的控制策略。对于电网严重短暂跌落,通过对转子电流和直流侧电压滞环比较来控制Active Crowbar和直流侧卸荷电路,以卸荷多余能量并保护变流器,并保持风电机组的并网。对于电网的长时间跌落,还进行电网电压闭环发送无功,以支持电网进行恢复。通过仿真模型验证了所提出的控制策略能很好地抑制转子侧电流和直流侧电压的上升,并对电网提供无功支持。

Simulation of LVRT strategy for DFIG wind power system

For the LVRT(Low Voltage Ride Through) of DFIG(Doubly Fed Induction Generator) set,the grid-connection requirements for wind power generation during grid voltage dip is introduced,several existing strategies are analyzed and a corresponding control strategy is proposed.For the deep and short voltage dip,the Active Crowbar and DC dumping circuit are controlled by the hysteresis loop of rotor current and DC voltage to dump the superabundant energy,protect the power converter and maintain the grid-connection o...