A novel Unity Power Factor control strategy based on flux re-orientation for PMSG based wind turbine

This paper presents a novel zero d-axis current Unity Power Factor (UPF) control strategy for the mutil-pole permanent magnet synchronous generator (PMSG) used in the wind turbine employing the full-scale frequency converter. In this study, the wind turbine front-end converter adopts the twice flux orientated vector control technique. Firstly, the synchronized rotating reference frame is orientated on the generator rotor flux according to the accurate PMSG rotor spatial position detected by the advanced encoder. After obtaining the spatial position of the generator stator flux vector in the rotor flux oriented control, the synchronized rotating reference frame of the wind turbine front-end converter is secondly orientated on the stator flux. In this paper proposed control scheme, the complex integral computation caused by the stator flux spatial position confirmation is inevitable. Furthermore, the Zero d-axis Current (ZDC) control scheme and UPF control scheme are realized. Finally, The control algorithm is implemented on TMS320F28335 DSP and the viability of the scheme is confirmed through experimental studies.