新型联合仿真在双馈风电机组电网不平衡故障下的应用研究

Research on application of novel co-simulation in doubly fed induction generator under unbalanced fault

由于双馈电机的定子绕组与电网相互连接,双馈电机对电网的故障较为敏感。在电网所有故障类型中,不平衡故障发生的频率更高。文中建立了新型联合仿真方法,利用Ansoft Maxell,MATLAB/Simulink以及Ansoft Simplorer三个软件联合仿真搭建了1.5 MW双馈发电系统,这三部分的联合仿真,既可以考虑电机模型真实因素,也能完全实现模拟双馈发电系统。模拟了双馈电机在B型单相接地故障下的暂态过程,得出了在B型单相接地故障下双馈电机的定子磁链以及转子电压等电气量的变化过程。最后,联合仿真结果与理论分析一致,验证了该仿真方法的有效性。

Because the stator winding is directly connected with the power grid,the Doubly Fed Induction Generator( DFIG) is sensitive to the fault of the power network. Among all the grid fault types,the unbalanced fault is the highest frequency of the fault. A novel co-simulation method has been presented in this paper. Then 1. 5 MW DFIG wind power system has been built via a coupled simulation: Ansoft Maxell,MATLAB/Simulink and Ansoft Simplorer. The co-simulation can not only consider the real factors of the motor model,but also fully realize the simulation of doubly fed induction generator system. and the variation of DFIG under single-phase-to-ground dip of type B is simulated,the changes of the stator flux and the rotor voltage of the DFIG under single-phase-to-ground dip of type B is obtained. Finally,the simulation results are in agreement with the theoretical analysis,which verifies the validity of the transient process.