离网型双馈风力发电机组控制策略研究

Research on Control Strategy of Off-grid Doubly-fed Wind Turbine

本研究首先分析了离网型风力发电机组的数学模型,以及转子侧变换器、定子侧变换器的数学模型。然后根据数学模型,在转子侧变换器推导了直接电压矢量控制,其控制目标为定子侧的输出电压的幅值与频率;在定子侧变换器推导了基于定子电压矢量定向的矢量控制,采用电压平方外环、电流内环的双环控制,其控制目标为直流母线电压。为验证该控制策略,搭建了仿真模型,仿真结果显示,该方法能够实现离网型双馈风力发电机组输出稳定的电压。

In this paper,the mathematical model of the off-grid wind turbine,the rotor side converter and the stator side converter were analyzed.Then,according to the mathematical model,the direct voltage vector control was derived in the rotor side converter and the control targets were the amplitude and frequency of the output voltage on the stator side.The vector control based on the stator voltage vector orientation was derived in the stator-side converter and the control targets were the DC bus voltage by using the voltage square outer loop and the current inner loop.In order to verify the control strategy,a simulation model was built,and the results show that the method can achieve stable output voltage of off-grid doublyfed wind turbine.