Wind power is one of the quickest growing energy sources worldwide.Typically, the control system of a wind energy conversion system (WECS) has a hierarchy of three levels. The higher level is a supervisory controller that produces commands related to start up, shut down, breaking, and other safety and operational commands. The middle level decides the optimized set points for speed, power, and current. The lower level is composed of the feedback loops that attempt to achieve the set points as set... Mehr