基于谐振控制器的双馈风力发电机组网侧变频器控制策略研究

Research on Control Strategy of Grid-side Inverter of Doubly-fed Wind Turbine Based on Resonance Controller

双馈异步风力发电机(DFIG)中,网侧变频器所采用的是基于比例积分控制规律(PI调节器)的电网电压定向矢量控制方法(VOC),无法抑制二倍频转矩脉动,对此,以三相电压不平衡为条件,构建DFIG组网侧变频器模型,并在基于PI调节器的VOC上探究比例谐振(PR)控制器的VOC以及基于比例积分谐振(PIR)控制器的VOC,然后根据基于1.5 MW的WDFIG模型进行系统的仿真验证,结果显示,基于PIR控制器的VOC能够有效抑制三相电压不平衡所产生的网侧变频器不对称运行。

In the doubly-fed asynchronous wind generator(DFIG),the grid-side inverter uses the grid voltage-oriented vector control method(VOC)based on the proportional integral control law(PI regulator),which cannot suppress the double frequency torque ripple In this regard,the DFIG network-side inverter model will be constructed on the condition of the three-phase voltage imbalance,and the VOC of the proportional resonance(PR)controller and the proportional integral resonance(PIR)will be explored on the VOC based on the PI regulator.The VOC of the controller is verified by simulation of the system based on the 1.5M WDFIG model.The results show that the VOC based on the PIR controller can effectively suppress the asymmetric operation of the grid-side inverter caused by the unbalanced three-phase voltage.