The output of new energy represented by wind power and photovoltaic power features volatility and randomness. It is a practical approach to use the guaranteed rate with statistical characteristics to analyze the output coefficient of new energy. However

there is a lack of analysis and demonstration on the value of the new energy output guaranteed rate. To solve this problem

a selection method for the new energy output guaranteed rate considering optimal energy storage configuration is proposed. First

the influence of the new energy output guaranteed rate on the new energy output coefficient is analyzed. Secondly

with the goal of minimizing the comprehensive costs

an optimal configuration model of energy storage based on the output guaranteed rate of new energy is constructed

and particle swarm optimization is used for the optimization solution. Then

according to the optimal energy storage configuration results under different guaranteed rates

a reasonable new energy output guaranteed rate is determined by maximizing the comprehensive benefits obtained from energy storage. Finally

an example applied to the power grid in an area of Guangdong in Southern China is provided to illustrate the effectiveness of the proposed method.