基于Crowbar电路的双馈风电机组低电压穿越能力

Low voltage ride-through capability of doubly fed wind power generators based on crowbar circuit

摘要:

针对传统控制策略的双馈风电机组的低电压穿越能力非常有限,不能满足我国电网运行条例中关于低电压穿越能力的要求．通过在转子侧增加撬棒(Crowbar)电路,在不改善控制策略的情况下,对Crowbar电路提高双馈风电机组的低电压穿越能力进行理论分析,并利用综合稳定程序(PSASP)对没有加装Crowbar电路和加装了Crowbar电路的双馈风电机组进行仿真比对.结果表明,Crowbar电路可以提高双馈风电机组的低电压穿越能力．利用风电机组低电压穿越试验装置在某地进行了现场试验,进一步证明了加装Crowbar电路不仅在理论上可以提高DFIG的低电压穿越能力,在实际应用中也是完全可行的方法．

Abstract:

Based on traditional control strategy, it is very limited to low voltage ride-through (LVRT) of doubly fed wind power generators. It can not meet technical rule for connecting wind farm to power system of China. It has to add the hardware circuit if the control strategy is not improved. The popular method is to add crowbar circuit to the rotor side. A model of doubly fed wind power generators based on traditional control strategy is built in this paper. The theory of LVRT was analyzed. Simulation of doubly fed wind power generators with crowbar circuit was undertaken and an experiment was undertaken in order to verify its virtue. The results show doubly fed wind power generators with crowbar circuit is more practical, which provides a powerful reference for improving the ability of LVRT of wind farm wind.