A novel 6/3-phase dual stator-winding induction generator system applied in wind power generation

The usual dual-stator winding induction generator (DWIG) is composed of three-phase power windings and three-phase control windings, named as 3/3-phase DWIG. The power winding has only three phases, and also connects to a rectifier load, which results in larger harmonic magnetomotive force (MMF) in the generator. In order to overcome these problems, 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-phase power windings of it are divided into two Y windings shifted by 30° electrical angle. In this paper, the control technology of this novel 6/3-phase DWIG system operating on variable speeds is studied. Based on the control winding flux oriented scheme, for a 600 V/18 kW 6/3-phase DWIG system running at variable speeds, a series of simulations and experiments are researched. The results demonstrate that the system has the good performance over a wide speed range of 500~1000 rpm, and it is suitable for the application of wind power generation.