State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China

The variability and nondispatchable nature of wind power presents sustainable challenges to steady operation of power systems. In order to enhance system's accommodation of wind power to increase its utilization rate, the hybrid energy storage system composed of battery and pumped hydroenergy storage station and the coordinated operation method in the power system with high penetration of wind power are proposed. Discrete Fourier transform (DFT) is used to analyze the spectral profile of wind power, which is decomposed into different time-varying periodic components. Battery storage is used for compensating for the high frequency component so as to satisfy the upper fluctuation rate limit to grid-connection, while pumped hydroenergy storage station is used for peak regulation in the power system. The proposed model and operation method are verified on a modified IEEE RTS-96 system. The results are presented to verify the feasibility and effectiveness of the proposed model and method. This work is supported by National Natural Science Foundation of China (No. 51207062).