Wind turbine power limitation using power loop: comparison between proportional-integral and pole placement method

Abstract

This paper deals with power limitation for a small-sized stall-regulated variable speed wind energy conversion system. Here, a Power Loop Control using a Proportional Integral (PI) controller and Pole Placement method are presented. Control effort is focused to control the generated power and the generator torque corresponding to the wind speed variation above the rated wind speed. A simple tuning method of PI controller for Power Loop Control is briefly explained. For pole placement method, the influence of different damping ratios is shown. Finally, the comparison of the transient response of both methods is demonstrated. From the comparison result, it is found that the pole placement method presents some significant overshoot compared to Power Loop case, but it can reach the steady-state value faster than PI. Using pole placement method, the result shows that system with higher damping ratio presents better transient response.