Optimization Method of Hybrid Energy Storage Configuration for Pumped Storage Power Station Based on Spectrum Analysis

The renewable energy of distributed power systems has the advantages of small side effects, large storage content, wide distribution, and high environmental benefits. It plays an important role in today's energy revolution. However, with the increasing utilization rate of the renewable energy generation system year by year, its inherent volatility, intermittency, and randomness put forward higher requirements for frequency regulation of interconnected power grids. Therefore, how to consider the impact of the frequency regulation demand response and coordinate PPS and electrochemical energy storage to achieve efficient grid frequency regulation is very important. Based on the frequency spectrum analysis of the pumped storage power station, this paper optimizes the frequency regulation control strategy of the pumped storage system participating in the interconnected power grid. The paper also proposes a control method of combined energy storage. The objective function and constraint conditions are combined according to certain rules to construct a generalized objective function. The constrained problem is transformed into an unconstrained problem to solve, which improves the control effect of the power grid frequency regulation. It makes the dynamic performance of the system better, ensures the safe and economic operation of the power grid, and provides a practical and effective control method for the power system’s frequency regulation.