Optimal design of a self-excited capacitor in a dual-stator winding induction generator

The design requirement of the self-excited capacitor in a dual-stator winding induction generator (DSWIG) is different from that of the conventional induction generator, because there are numerous combinations between the reactive capacitance of two windings. The efficiency optimisation is taken as the design aim for a self-excited capacitor in this paper. Based on the equivalent circuit model of the induction generator-rectifier system, the characteristic analysis of a three-phase bridge rectifier with an AC capacitor is presented, especially the comprehensive analysis on the condition with neglecting commutation angle. Moreover, the relation between self-excited capacitor and corresponding stator loss is derived, and the value of self-excited capacitor at maximum efficiency is obtained. The coincidence between the experimental results and analytical results verifies the validity of the analytical method. The results obtained herein are of importance to the optimal design of the self-excited capacitor in DSWIG.