Capacity value assessment of energy storage for load supplying considering system demand and capacity credit

In order to compensate for the lack of specific quantification methods and processes for the capacity value of hybrid energy storage in existing studies, and the inability to consider the marginal investment benefit of the load supply capacity value of energy storage, this paper proposes a method for evaluating the load supply capacity value of energy storage that considers t he system demand and the capacity confidence level. Firstly, an optimal dispatch model of energy storage based on peak load reduction is established, and a framework for calculating the capacity credit of energy storage considering multiple time sca les is proposed based on the optimization model; secondly, based on the relationship between the load supply capacity value of energy storage and the system capacity adequacy, a calculation method for the marginal benefit of energy storage considering the system adequacy and an assessment framework for the load supply capacity value of energy storage are proposed; and finally, the effectiveness of the methodology is verified by an analysis of the examples proposed in this paper.