Two-Stage Optimization Strategy for Managing Electrochemical Energy Storage in Power Grid Peak Shaving and Frequency Regulation

Due to the large-scale access of new energy, its volatility and intermittent have brought great challenges to the power grid dispatching operation, increasing the workload and work difficulty of the power grid frequency regulation, and the increase in the installed proportion of new energy has also led to the further expansion of the peak-valley power difference. Electrochemical energy storage has bidirectional adjustment ability, which can quickly and accurately respond to scheduling instructions, but the adjustment ability of a single energy storage power station is limited, and most of the current studies based on the energy storage to participate in a certain type of auxiliary services, which cannot be fully utilized within the range of its life cycle. To solve this problem, a two-stage power optimization allocation strategy is proposed, in which electrochemical energy storage participates in peak regulation and frequency regulation. In the first stage, the adjustment cost, adjustment capacity and health status of each energy storage station in the region are considered, and the output of each energy storage station is determined with the goal of pursuing dispatching economy and reliability. In the second stage, the output of each energy storage power station is sent to each energy storage unit under the power station as the total power, and the goal is to quickly balance the SOC of each energy storage unit, which is conducive to the overall scheduling of the energy storage power station.