Abstract：Considering the operation features of direct-drive electrically excited synchronous generator(EESG) in wind power system, the flux observer based on voltage model of EESG is feasible. Improved second-order generalized integrator(ISOGI) which could eliminate the DC bias and integral windup is used to replace pure integrator in this paper, and a new flux observer based on ISOGI is achieved. The amplitude and phase of air-gap flux are obtained from ISOGI flux observer, and the EESG vector control system based on air-gap flux oriented could be achieved. Results show feasibility of ISOGI flux observer, and this method has excellent steady and transient performance.
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2013, Vol. 28 
