基于附加阻尼控制的风电并网系统阻尼转矩分析

Damping Torque Analysis of Grid-connected Wind Power System Based on Supplementary Damping Control

针对双馈感应风力发电机组附加阻尼控制器对系统低频振荡阻尼的影响进行了研究。首先建立了双馈风电机组接入区域互联系统的动态模型,并基于风电系统功率控制回路设计附加阻尼控制器,使风电机组能够主动抑制系统的低频振荡。然后通过阻尼转矩分析证明了基于附加阻尼控制器的风电机组可以增强系统的阻尼;并导出系统阻尼转矩系数的解析表达式,进一步分析控制参数和系统运行条件对系统阻尼特性的影响。最后,在算例中对风电机组接入区域互联系统进行了仿真验证,证明了理论分析的结果。

The impact of supplementary damping controller for the doubly fed induction generator on system low frequency oscillation damping is studied.The simplified mathematical model of inter-area system is set up,and an auxiliary damping controller is designed based on the active power control loop of the wind turbine,so that the wind turbine can actively suppress the system low-frequency oscillation.It is proved that the wind turbine additional damping controller can enhance the system damping through the damping torque analysis.The expression of damping torque coefficient is deduced,which reveal the impact of control parameters and operating conditions on the system damping characteristics.Finally,the wind turbine accessed in area interconnection system is simulated and verified in an example,and the results of theoretical analysis are proved.