SOC feedback control for wind and ESS hybrid power system frequency regulation

With the increased penetration of wind generation, the traditional control scheme of the wind turbine (WT), which is designed for maximum wind power extraction, is no longer suitable to meet emerging grid requirements for wind farms (WFs) to participate in frequency regulation. The control scheme of the WT with respect to grid frequency regulation is proposed in many studies, such as those on pitch control. Also, energy storage technologies have drawn much attention in recent years, as the technology matures and costs decrease, and present themselves as a potential solution for the challenge brought about by the uncertainty of renewable energy generation with regard to power system stability. A power system consisting of a high penetration of wind generation and energy storage systems (ESS) is investigated in this paper for the regulation of grid frequency. A new strategy called state of charge (SOC) feedback control is proposed and the performance of the grid frequency deviation response and the SOC of the battery are presented. The model of the power system studied in this paper is established on the MATLAB/SIMULINK platform.