Harmonic magnetomotive force and static-dynamic characteristics of the 6/3-phase dual stator-winding induction generator

The usual dual-stator winding induction generator (DWIG) is composed of 3-phase power winding and 3-phase control winding, defined as 3/3-phase DWIG. The power winding has only three phases, and connects to a rectifier load, which results in larger harmonic magnetomotive force (MMF) in the generator. In order to overcome this problem and improve the performance of the DWIG system, the power winding of 3/3-phase DWIG is converted from three phases to six phases. A novel 6/3-phase DWIG with six phase power windings and three phase control windings is proposed. The six power windings of it are divided to two Y windings shifted by 30deg electrical angle. In this paper, in order to further study the static and dynamic characteristics of 6/3-phase DWIG system with a rectifier load, harmonic MMF in generator are analyzed in detail. The corresponding relationship between the harmonic current and harmonic MMF is achieved. Based on these, the model of a 600 V/18 kW 6/3-phase DWIG system is built-up. The simulation and experiment results indicate that the 6/3-phase DWIG system has excellent performance over the wide speed rang and is suitable for the application of wind generation.