基于预期SVM-DTC的双馈风力发电系统研究

针对双馈风力发电机的传统直接转矩控制(DTC)会造成转矩和磁链的波形脉动的问题,提出一种基于预期空间电压矢量的双馈风力发电机直接转矩控制,利用矢量控制连续平滑和直接转矩控制快速响应的特性,补偿风速变化引起的扰动,提高系统的动态性能和稳定性。仿真结果表明,对于风速变化,基于预期SVM-DTC的双馈风力发电机在磁链轨迹、转速响应与调节、转矩跟随与脉动抑制以及电压波动等方面的控制性能都优于传统DTC。

RESEARCH OF DOUBLY-FED WIND POWER SYSTEM BASED ON EXPECTED SVM-DTC

In order to address the waveform pulsation from magnetic flux linkage and torque caused by traditional DTC of doubly-fed induction generator (DFIG), a new kind of DFIG based on expected SVM-DTC is proposed. With SVM-DTC, disturbance from wind velocity changes can be compensated by the continuity and smoothness of vector control and the rapid response of DTC. The simulation results in wind velocity changes show that DFIG based on expected SVM-DTC is easier to be controlled than traditional DTC in flux linkage, speed response and adjustment, torque follow performance, ripple rejection and voltage fluctuation.