In the recent time, Permanent-Magnet Synchronous-Generator (PMSG) based variable-speed Wind-Energy Conversion-Systems (WECS) has become very attractive to many researchers. The research aim is to analyse different synchronous machine and compare them based on their maximum power generation. This paper reviews various aspects of PMSG such as topologies with controlled and uncontrolled rectifier, grid-connected and standalone mode of operation with various control methods of PMSG based WECS and recent optimization approaches. The performance analysis of PMSG can be enhanced by adopting a number of control mechanisms with the benefit of advanced optimization techniques. A comparative analysis is carried out based on the techniques used and their corresponding advantages and drawbacks are discussed.

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