不对称电网电压下双馈风力发电机的控制方法

Control strategy of DFIG under unbalanced grid voltage condition

分析了不对称电网电压下双馈风力发电机的运行特性,进而提出一种基于多频点比例积分谐振控制器的矢量控制方法,通过定子侧功率的单闭环结构,实现不对称电网电压下的双馈电机控制。相比于传统的正负序双dq域控制,所提方法既不需要负序dq域控制器,也不需要转子电流内环,控制结构简单。同时,该方法只需对一个简单参数(λ[0,2])进行调整,即可实现不对称电网电压下双馈风电系统的多种不同控制目标。基于MATLAB/Simulink平台搭建了1.5 MW双馈风电仿真平台,仿真结果验证了所提算法的正确性和有效性。

The behavior of DFIG（Doubly-Fed Induction wind Generator） under unbalanced grid voltage condition is analyzed and a vector control method based on multi-frequency proportional integral resonant controller is proposed,which applies the single close-loop structure of stator-side power to realize the control of DFIG. Compared with the traditional dual dq-domain control,its control structure is simple,without the PI controller~ in negative dq domain and the inner loop of rotor current. The multiple control objectives are achieved by conveniently adjusting the only parameter（λ∈[0,2]）. A 1.5 MW DFIG-based wind power system is built with MATLAB/Simulink and the simulative results validate the effectiveness of the proposed method.