中文摘要：

针对目前含双馈风机的风电场潮流计算无法精确计及双馈风机内部损耗的问题,建立了含双PWM变流器影响的双馈风力发电系统模型,通过同时考虑双馈风力发电系统功率的流动关系和双PWM变流器损耗对双馈风力发电系统的输出功率影响,实现了双馈风机内部损耗的精确计算;将发电机定子、转子和虚拟内节点以及变流器节点作为潮流计算中的节点接入电网,进行潮流计算,并将结果与现有不考虑变流器损耗的方法进行对比,研究结果表明低风速时两种模型下的风电机组效率的差异较大;高风速时在潮流计算精度要求不高情况下,可忽略变流器损耗对风力发电系统的影响.

英文摘要：

Due to the inaccuracy of the DFIG internal losses taken into account for the flow calculation,a DFIG power system model which considers the impact of dual PWM converter is proposed based on the commonly-used power flow calculation model and the characters of power flow of DFIG as well as the losses of dual PWM converter.The generator stator,rotor and virtual node as well as the converters node is imported to calculate the power flow.By comparing whit the results that ignore the losses of the converters,it is validated that the difference of wind farm efficiency under low wind speed is larger than under high wind speed; the impact of the converters can be ignored when no high accuracy is requested under high wind speed.