Adaptive fuzzy control of a variable speed power generating system with doubly excited reluctance machine

Fuzzy control methods are developed for a highly efficient variable speed constant frequency power generating system, with wind power generation as an example. In slip power recovery configuration, the system is composed of a doubly excited brushless reluctance-machine and a reduced rating power electronic converter unit linking the stator secondary circuit with the power line. The doubly excited brushless reluctance machine has high efficiency, high reliability and rugged construction. Under fuzzy logic control which enables superior dynamic performance, the operational speed is controlled to track the optimal power-speed profile of the wind turbine. Reactive power is independently controllable. Active and reactive power capacities of the system are also discussed