定子双绕组风力感应发电机的运行特性分析

Analysis of operating characteristics of dual stator-winding wind power induction generator

为了深入研究应用于风力发电系统的定子双绕组感应发电机(dual stator-winding induction generator,DWIG)运行特性,从等效电路和相量图出发,分析了DWIG在转速和负载变化情况下的运行机理及特点,推导了不同负载下控制绕组电流的计算方法。在此基础上,针对额定转速和变转速2种运行工况,对1台18.5kW带感性负载的DWIG样机运行特性进行了详细分析。结果表明:控制绕组可对励磁无功功率进行调节实现空载建压,控制绕组电流和转差率随负载电流的增加而增大,效率随负载电流的增加先增大后减小,在变转速情况下控制绕能进行无功功率调节实现恒压输出。理论分析与仿真结果一致证明了研究结果的正确性。

To research the operating characteristics of dual stator-winding induction generator （DWIG ） in wind power generation system ,the operating mechanism and features of DWIG with the speed change as well as the load change are analyzed based on the equivalent circuit and phasor diagram .And then ,the calculation methods of control winding current with different loads are derived .Furthermore ,aiming at the rated and variable speed operation modes ,the operating characteristics of a 18 .5 kW DWIG with inductive load are analyzed in detail .The results show that the control winding can regulate the excitation reactive power to build up the no-load voltage .With the increase of the load current ,the control winding current and the slip ration increase ,and the efficiency increases first and then decreases .The control winding can regulate the reactive power in variable speed condition for constant voltage output .The correctness of the research is verified by the consistency of the theoretical analysis and the simulation results .