双馈感应风力发电机组的滑模直接电压控制

Sliding-mode-direct-voltage-control of wind turbines based on double-fed induction generators

为解决PI矢量控制动态响应慢且依赖电机精确参数的问题,本文将滑模控制与空间矢量调制结合,提出了一种开关频率固定的滑模直接电压控制(SMDVC)方法,以实现双馈感应电机(DFIG)的电网同步控制.实验结果表明,提出的SMDVC方法具有比PI矢量控制更好的动态性能,即使在电网电压不平衡工况下,也能较好地控制DFIG定子电压实现对电网电压的精确跟踪.

To handle the slow dynamic response and the dependency on accurate machine parameters in PI vector control, we propose a slidingmode directvoltagecontrol （SMDVC） with constant switching frequency to realize the grid synchronized control for the doublefed induction generators （DFIG）. Experimental results show that the proposed SMDVC method is with better dynamic performance than the PI vector control; it can effectively control the stator voltages of DFIG to accurately track the grid voltages under imbalance conditions.