Grid-Connected and Standalone Control for Dual-Stator Brushless Doubly Fed Induction Generator

This article proposes an improved vector control scheme based on the magnetizing current for the dual-stator brushless doubly fed induction generator during the standalone operation. The conventional scheme of the standalone control chooses the control winding current as the control object for the inner current loop, suffering from the large variation of the output voltage caused by the large output impedance. The improved scheme of this article selects the power winding magnetizing current as the control object, which can reduce the demagnetizing influence of the load current. Meanwhile, the design of the outer voltage loop can be simplified because of the direct relationship between the output voltage and the power winding magnetizing current. The main aim of this article is to design an improved standalone controller to enhance the transient performance of the system. A prototype of the dual-stator brushless doubly fed induction generator, which employs the proposed scheme, is measured for validation.