Control strategies for an autonomous induction generator taking the saturation effect into account

In this paper, we present the voltage built up process and a control to regulate the DC voltage of an isolated induction generator connected to a rectifier and driven by a variable speed wind turbine. Two strategies, based on the rotor flux oriented vector control, are proposed. Both rotor flux and DC bus voltage are regulated by two control loops which operate in parallel. The model used for the induction generator is obtained by the application of the Park transform. This model takes account of the saturation effect by a variable magnetizing inductance function of the current. The inductance variation is described by a polynomial function. The proposed control strategies are validated through simulations. The obtained results are presented and discussed.