Power Limitation at High Wind Speeds for a Variable Speed Fixed Pitch Wind Turbine Using Closed-Loop Scalar Control

N. Rosmin, S.J. Watson, M. Tompson
2010 The Renewable Energies and Power Quality Journal (RE&PQJ)  
This paper represents the speed regulation for a fixed pitch stall-regulated variable speed wind energy conversion system. The speed regulation in the high (above rated) wind speeds region is the main topic of this paper where in this region, the rotor/generator speed activity is controlled by using the concept of adjustable or variable speed drive (ASD/VSD). Speeds need to be controlled in order to maintain the generated power by reducing the power coefficient from the peak of Cp curve. It can
more » ... of Cp curve. It can be achieved by reducing the tip speed ratio from the optimum value when wind speed vary from rated wind speed to cut-out wind speed. Therefore, closed-loop scalar speed control with the concept of constant ratio of voltage/frequency was being applied. In addition, simple algorithms of drive train and squirrel cage induction generator were being used. A proportional integral (PI) controller was used to control the generator slip speed. Results demonstrate that such a closed-loop scalar control with proportional integral (PI) controller is good enough to accurately maintain constant power by restraining the rotational speed corresponding to the wind speed variation at the rated wind speed.
doi:10.24084/repqj08.572 fatcat:rhcslifijbgyhfsykoy7dvnr6q