Design and Analysis of Composite Rotor Brushless Doubly Fed Generator for Wind Turbine
Brushless doubly-fed generators have promising applications in offshore wind power generation and other fields due to the elimination of brush slip rings and their high reliability.In order to enhance the modu-lation capability of the rotor,this paper investigated a composite rotor brushless doubly-fed generator com-bined with a short-circuited coil plus a salient pole reluctance modulator based on the general airgap field modulation theory for electrical machines.Firstly,the mechanism that the composite modulator can generate higher useful harmonic components than a single modulator was theoretically revealed,and then the structure of the composite rotor was optimized,including the number of cage bars on the salient pole and the connec-tion type of the short-circuited coil.The 2D finite element and experimental results verified the validity of the motor topology and analysis method.
brushless doubly fedmagnetic field modulationsalient pole reluctanceshort circuit coilwind power generation
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