基于PSCAD的变速恒频双馈风电系统动态模型仿真

Research on the dynamic simulation model of double-fed variable-speed constant-frequency wind power system based on PSCAD

为了建立双馈风电系统的动态仿真模型,根据abc-dq坐标变换得到了同步坐标系下双馈电机定、转子解耦数学模型,采用定子侧电压定向矢量控制,转子测定子磁链定向矢量技术,并引入滞环控制环节,研究了风速变化和电网电压跌落情况下双馈风电机组的运行特点.利用PSCAD软件建立了双馈风力发电机组的模型并进行仿真分析,结果表明,通过矢量控制可以改善系统的低电压穿越能力,验证了该控制方案和仿真模型的正确性和有效性.

In order to build the dynamic simulation model of a double-fed wind power system,the mathematical model of DFIG was built through abc-dq coordinate transformations. The grid-side converter is adapted by using vector control oriented by grid voltage. The rotor-side converter is achieved by stator flux directional vector con- trol technology. Meanwhile,hysteretic current control technology is introduced. When the wind speed changes or the voltage drops,the simulation model is analyzed by PSCAD. The results show that the vector control can improve the ability of low voltage ride through the system, and that the control system is effective and the simulation is right.