Evaluation of ancillary services from wind turbines

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.

The method is applied to a simulation of Chalmers wind turbine and to data measured at the commercial wind farm, focusing on FCR-D Down. Two days with different operating conditions were analysed using the same procedure. The study looks at power response, droop, ramp rate, and how well the response matched the accepted bids. The results show that the windfarm responded faster and with a stronger droop than the simulated turbine, which acts as a reference for Svk’s requirements. The method can support further evaluation of frequency control from wind farms and help wind farm owners choose turbines that are suitable for frequency control.

Most welcome!