Speed Sensorless Sliding Mode Control Strategy of Dual Winding Induction Machine Starting/Generation Systems

The speed signal plays a vital role in the starting/generation system of dual winding induction generator (DWIG). However, due to the poor working environment, the sampling of the speed signal is limited. Therefore, based on the velocity control strategy of the sliding mode observer and the mathematical model of the DWIG, the shortcomings of traditional sliding mode velocity control are analyzed in this article. Based on the principle that the two sets of windings of a double-winding motor are tightly coupled and the flux link is connected, the mechanical parameters of the traditional sliding mode observer are replaced by those on the power winding side that can be observed in real time, thus reducing the inaccurate observation caused by complex conditions and realizing the precise control of the sliding mode without velocity. The compatibility and efficiency of starting control and generation control of DWIG are improved, and the smooth transition and stable generation of the DWIG are ensured.