Frequency-Voltage Coordinated Regulation Method based on Support Capability of Wind-Storage Combined Systems

The wind-storage combined system (WSCS) can solve the frequency and voltage capability problems caused by the intermittent and fluctuating wind power in large-scale wind farms. However, there is a challenge in how to fully utilize the support capabilities of energy storage systems (ESS) and wind farms (WFs) to participate in frequency regulation (FR) and voltage regulation (VR). To address this challenge, a frequency and voltage coordinated regulation (FVCR) method is proposed, which is divided into three parts: 1) A WFs frequency support capability quantification strategy, which respectively considers the kinetic energy equation and power characteristics, is conducted to maximize the WTs frequency support capabilities. 2) An ESS frequency support capability quantification strategy, which considers the ESS’s state of charge (SoC), is established to evaluate the ESS performance. 3) A frequency and voltage coordinated regulation strategy, which consider the different support capabilities of WFs and ESS, is proposed to reasonably coordinate FR and VR under the capacity constraint. Numerous test results are analyzed to verify the effectiveness and performance of the proposed FVCR method of WSCS.