Coordinated Control Technique of PMSG based Wind Energy Conversion System during Repetitive Grid Fault

This paper presents a coordinated control of pitch angle of a wind turbine, flux control of permanent magnet synchronous generator (PMSG) and voltage regulation of grid for low voltage ride through (LVRT) enhancement of PMSG based variable speed wind energy conversion system (WECS). Within this strategy, pitch angle controller is modified to adjust the pitch for power smoothing during variable wind speed as well as LVRT during repetitive grid fault. Flux controller is used to weakening the induced flux through providing negative field regulating current to keep the DC link voltage within the permissible limit in grid voltage dips. And reactive power control is used to provide voltage support during a grid fault. Extensive simulations of proposed method have been carried out under different repetitive fault. The proposed controller performance is validated by time series simulation. The results are compared with different conventional control for verification.