Steady-State Characteristics of the Dual-Stator Brushless Doubly Fed Induction Generator

This paper presents a comprehensive investigation of the steady-state characteristics of a dual-stator brushless doubly fed induction generator for wind power application. Unlike the popular brushless doubly fed generator with a nested-loop or reluctance rotor, the dual-stator construction is inherently brushless and free of undesirable harmonic-related issues. An extended spiral vector model taking into account core losses and iron saturation is first developed for analytical analysis and performance prediction. The cross-coupling capability, power factor of control winding, torque capability, and available operation regions under doubly fed synchronous operation are then considered and correlated with the electric equivalent circuit parameters. Both simulation and experimental results are provided to verify the effectiveness of the analysis.