Comparison of different structures for variable speed constant frequency wind power generator

This paper presents a comparative study on four different structures of variable speed constant frequency (VSCF) wind power generator. The analysis results show that the direct-driven permanent magnet (PM) generator has good performance but high cost; the doubly-fed induction generator has low cost but poor reliability; the half-direct-driven PM generator and doubly-fed brushless generator may be the alternative choices for VSCF wind power generation systems.