Adaptive Pitch Control of Variable-Pitch PMSG Based Wind Turbine

Jian Chen,Tao Yu,Hongchun Shu,Wenyong Duan,Bo Yang,Na An,Libing Chen

doi:10.3390/app9194109

Abstract

This paper presents an adaptive pitch-angle control approach for a permanent magnet-synchronous generator-based wind turbine (PMSG-WT) connecting with a power grid to limit extracted power above the rated wind speed. In the proposed control approach, a designed perturbation observer is employed for estimating and compensating unknown parameter uncertainties, system nonlinearities, and unknown disturbances. The proposed control approach does not require full state measurements or the accurate system model. Simulation tests verify the effectiveness of the proposed control approach. The simulation results demonstrate that compared with the feedback linearizing controller, conventional vector controller with proportional-integral (PI) loops, and PI controller with gain scheduling, the proposed control approach can always maintain the extracted wind power around rated power, and has higher performance and robustness against disturbance and parameter uncertainties.

Highlights

Wind power generation systems (WPGSs) have become competitive and attractive as exhaustless and clean power sources [1,2,3,4,5,6]
This paper has developed a nonlinear adaptive pitch controller for the permanent magnet-synchronous generator-based wind turbine (PMSG-wind turbines (WT)) to limit the extracted power from time-varying wind in Region 3
In the proposed nonlinear adaptive controller (NAC), all time-varying and unknown dynamics of the PMSG-WT, e.g., nonlinearities, parameter uncertainties and disturbances, are included by defined perturbation terms, which are estimated by designed perturbation observers (POs) and states and perturbation observer (SPO)

Summary

Introduction

Wind power generation systems (WPGSs) have become competitive and attractive as exhaustless and clean power sources [1,2,3,4,5,6]. In Region 1, wind speed is lower than cut-in wind speed (Vci ), and the WT does not operate; in Region 2, wind speed is between cut-in wind speed (Vcut−in ) and rated wind speed (Vrated ), and the maximum wind power is required to be extracted by rotor speed control; in Region 3, wind speed is between rated wind speed (Vrated ) and cut-out wind speed (Vcut−out ), and its main control objective is maintaining extracted wind power around rated power via blade pitch control and electromagnetic torque control.

Methods

Results

Conclusion