Research on Trusted Capacity of New Energy with Storage under Spot Market Conditions

The randomness, intermittency, and volatility of new energy pose new challenges to the planning and operation of traditional power systems. Therefore, it is necessary to accurately evaluate the role and value of new energy and energy storage equipment in the power system. Firstly, based on the rules of Shandong Electric Power spot market, analyzes its market structure, trading process, price mechanism, operation mode, and settlement mechanism. Secondly, a new energy credible capacity calculation method based on a certain confidence level and historical data was determined for typical scenarios of wind farm storage and photovoltaic power station storage on the source side of the power system. Then, based on the current market electricity price under the conditions of the electricity spot market, with the goal of maximizing profits, the timing of energy storage output is determined, and the reliable capacity of new energy with storage is further determined. Optimization is carried out on a daily basis to determine the reliable capacity of new energy distribution and storage under different time periods, and to determine the value of improved reliable capacity. Finally, based on the historical output of new energy in a certain province and recent market electricity price data, the impact of energy storage charging and discharging behavior on the reliable capacity of new energy with storage in the power grid at different time periods is determined. Under the conditions of the spot market, based on the behavior of market entities, the proposed method for calculating the reliable capacity of new energy with storage can meet the supply guarantee needs of the power grid, and the feasibility and effectiveness of the proposed method are verified. This study contributes to promoting the application of new energy with storage in ensuring power grid reliability and provides a basis for the calculation of reliable capacity for new energy with storage.