The Study of Multimode Power Control System for MW Variable-Speed Wind Turbine

Abstract: Wind energy is a viable option to complement other types of pollution-free generation. In the past constant-speed wind turbine is used for the limitation of the control technology and manufacturing technology. But this kind wind turbine has low efficiency and small operation range. Recently, more and more people make their focus on studying the MW variable-speed wind turbine for its high efficiency in using wind energy and large operation range. In this paper, base on the study of the model for the variable-speed wind turbine, a multimode power control system is proposed. This control system is consisting of two controllers: the speed controller and the pitch controller. By judging the different power point, the control system use different controller to make the wind turbine run at different mode. Simulation results by using actual detailed parameters for wind turbine show the effectiveness and robustness of this control system. Key-Words: the shaft system model, feed-forward compensator, multimode power control system, loop-shaping, speed controller, pitch controller, wind turbine