System value for wind farms providing frequency services under different control frameworks

The rapid integration of renewable sources increases the system requirements for various ancillary services. Hence, many generation/demand assets, including renewable sources, are required to actively support the power system operation and security. In particular, with respect to frequency control, wind power curtailment is being replaced by proper strategies enabling wind participation in this task. In this paper, a unit commitment problem with inertia-dependent frequency constraints is proposed, with the inclusion of different schemes for wind contribution to frequency response: a de-loading control scheme and the deployment of frequency service through the kinetic energy stored on the wind turbines' rotors. The proposed procedure is applied to a future low-carbon Great Britain system scenario to quantify the effectiveness of the different wind regulation schemes.