A simple control strategy of a dual-star induction generator for wind power generating applications

This paper presents a new method for the voltage build-up process of an isolated-loaded dual star induction generator (DSIG) driven by a wind turbine. The machine delivers the active power to the load via two converters connected to a single capacitor on the DC side. During the voltage build-up process, the necessary stator currents references are injected by the converters; they could be calculated from the desired active power which will be sent to the load. This power is determined by the DC-bus voltage regulation, the reactive power which is necessary for the machine magnetization and finally from the six instantaneous voltages induced through the stator DSIG windings. Since the converter/capacitor model is non-linear, a fast and simple control strategy based on the input-output feedback linearization technique is applied to ensure the DC-bus voltage regulation. Computer simulations are provided to verify the validity of the proposed control algorithm.