双馈风力发电机组动态特性研究

The investigation on dynamic performance of DFIG under DTC-SVM control

本文以双馈风力发电机组为研究对象,在Simulink环境下搭建了基于直接转矩控制(DTC)的某1.5 MW双馈风力发电机组模型,并对其稳态仿真结果进行了验证。针对传统DTC存在的缺点,本文对直接转矩-空间矢量调制控制(DTC-SVM)方式下的模型进行了数学推导并搭建了仿真模型。在该控制方式下,滞环控制器被PI调节器取代,脉冲生成的方式采用固定频率的SVM得到。仿真结果显示,采用DTC-SVM的机组在风速阶跃响应整体动态性能上优于采用传统DTC的机组。

In this paper, the DFIG based wind turbine generation system is investigated and discussed. The model of a 1.5 MW DFIG based wind turbine generation system with direct torque control（DTC） is established under the environment of Simulink and the steady performances are validated. Considering the drawbacks of the traditional DTC, the DTC with space vector modulation（SVM） is introduced. This improved model then is deducted and established in Simulink. With this control strategy, the hysteresis controller is replaced by PI controller while the pulse is generated by a flxed frequency SVM. The results show that, the dynamic performance of wind turbine with DTC-SVM is better than the traditional DTC when dealing with wind speed fast change.