Re-cutin control of wind turbines based on a combined dead band of time and wind speed.

During major metrological events, such as typhoons, a wind turbine will frequently cutout and re-cutin as wind speed fluctuates around the cutout speed. Repeated cutouts can undermine the reliability and the safety of a wind turbine. A dead band of wind speed between cutout and re-cutin speeds can be utilized to prevent frequent cutouts. Although a dead band of wind speed is helpful, it is not efficient because wind speed fluctuates and varies during the occurrence of a typhoon. This paper proposes a combined dead band of wind speed and time to control re-cutins of wind turbines and prevent repeated cutouts. Numerical simulations completed using onsite wind data from a potential wind Farm in Hong Kong indicate that the number of cutouts of a wind turbine has the potential to be reduced by 65% with the proposed approach.