Evaluation of Ancillary Services from Wind Turbines

Abstract

Abstract There is currently limited guidance on evaluating the performance of wind turbines in delivering ancillary services based on measured operational data. This thesis presents an evaluation method that uses grid frequency variations to estimate droop and ramp rate without relying on the predefined step signals used in Svenska kraftnät’s prequalification process. The method is applied to a simulation of the Chalmers wind turbine and to measured data from a commercial wind farm, with a focus on FCR-D Down. Two days with different operating conditions were analyzed using the same evaluation procedure. The study examines power response, droop, ramp rate, and how well the response matched the accepted regulation bids. The results show that the commercial wind farm responded faster and with a stronger droop than the simulated turbine, which served as a reference model for Svk’s minimum performance requirements. The proposed method can support further evaluation of frequency control from wind farms and assist wind farm operators in selecting turbines suitable for frequency regulation.