Adaptive Pitch Control of Variable-Pitch PMSG Based Wind Turbine

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.

The MPPT algorithm combined with pitch angle control for the small-scale wind turbine in a wide speed range

“…The disadvantage of this method is that when exiting errors between signals, the system will not stabilize. In addition, the adaptive control has a long sampling time, so it reduces the system computation speed [35], [36]. Especially for a large nonlinear wind turbine system, the calculation time must be real-time, so the adaptive control is not suitable for applying in the SSWT system.…”