Grid-Side Energy Storage System Day-Ahead Bidding Strategy Based on Two-Level Decision in Spot Market

A multi-markets biding strategy decision model with grid-side battery energy storage system (BESS) as an independent market operator is proposed in this paper. First, the trading methods of BESS participating in the spot market are analyzed. on this basis, a two-layer transaction decision model is built with comprehensively considering the participation of BESS in the day-ahead market (including the electric energy market and the auxiliary service market) and the intra-day balance market. The upper layer aims to maximize the revenue of BESS participation in spot market transactions under the premise of meeting the operation constraints of BESS, which generates the time-sharing strategy and transmits it to the lower layer. The lower layer conducts joint day-ahead market clearing with the goal of maximizing the whole social benefits, and carry on the intra-day balance market clearing with the goal of minimizing system balance costs. The clearing results are fed back to the upper model. based on particle swarm optimization and CPLEX, the solution method for the two-layer model is designed. Finally, a wind-fire-storage test system is used for simulation analysis, and the results verify the feasibility and effectiveness of the proposed model and method.