An Optimal Decision-making Method for Independent Energy Storage Declaration Strategy Considering Comprehensive Transaction Benefits

In order to solve the problem of formulating declaration strategy for independent energy storage in electric power spot market and improve its comprehensive income in electric power spot market and frequency modulation market, an optimization decision-making method of independent energy storage declaration strategy considering comprehensive transaction benefits was proposed. The expected transaction income of independent energy storage is the product of the timesharing curve of its charge-discharge power plan and forecast in the electricity spot market. If the self-dispatching mode is adopted to participate in the spot market of electricity, independent energy storage can make its own charging and discharging power plan. The expected transaction income of independent energy storage includes capacity income and mileage income in frequency modulation market. The capacity income is determined by the expected winning capacity of independent energy storage and the expected clearing price. Mileage returns are determined by expected frequency modulation response mileage and mileage compensation price. The evaluation model of expected benefit of independent energy storage is constructed to optimize the capacity declaration and charge-discharge power plan of independent energy storage frequency modulation under the goal of maximizing expected benefit. An example was constructed based on the actual data of a provincial power grid to verify the effectiveness of the proposed method. The result of the example shows that the declaration strategy can increase the expected income of independent energy storage by more than 10%, which is helpful to improve the income of independent energy storage trading.