变速恒频双馈风力发电系统滑模控制策略研究

STUDY ON SLIDING MODE CONTROL OF VARIABLE SPEED CONSTANT FREQUENCY WIND-POWER SYSTEM WITH DOUBLY-FED INDUCTION GENERATOR

提出一种基于指数趋近率的积分变结构控制器,直接在转子静止abc坐标系中实现转子侧电流的无静差控制,避免了对转子电流进行坐标变换,简化了控制结构,且该控制策略响应速度快、控制精度高,对电机参数摄动和负载扰动具有较强的鲁棒性。仿真结果验证了控制策略的正确性。

The general vector control of doubly-fed induction generator （DFIG） need complicated coordinate transformation, and DFIG parameters uncertainty and external disturbance will cause the control system variation for the controller is PID. Regarding this, integral variable structure controller with exponential reaching law is proposed by which the rotor-side currents in the static abc coordinates, being relative to the rotation speed, are controlled without steady-state errors in the stator voltage orientated vector control. Under this condition, the coordinate transformation of the rotor-side currents avoid, control structure is simplified. The speed of response of the control scheme is quick, the control precision is high. The control scheme has the strong robustness for DFIG parameters uncertainty and external disturbance. By simulation, this control scheme developed by the authors has been validated.