双馈风电机组无功功率极限分析及控制

method was proposed to calculate the reactive power limit of doubly fed induction generator (DFIG) system based on the reactive power limit of stator side which was based on the considerations with current constraint and static stability limit, and the reactive power capacity of the grid side converter (GSC) which further explored the limit of reactive power output of dfig. The conventional control method of unit power factor operation of dfig was broken, which laid a theoretical foundation to participate in the regulation of grid system. At the same time, in order to realize the maximum reactive power operation of dfig system, the reactive power control method of wind turbine was analyzed and designed.. Finally, a constant frequency wind turbine is put forward and the calculation and analysis are carried out, and the feasibility of the proposed method is verified.