Energy storage optimal configuration method and system

The invention provides an energy storage optimal configuration method and system. The method comprises the steps that probability distribution of power fluctuation quantity is calculated based on thepower fluctuation quantity; an energy storage compensation power value of fluctuation quantity is calculated based on grid-connected fluctuation indexes and the probability distribution of the power fluctuation quantity; rated power and rated capacity of the energy storage and the initial charged state are determined based on the energy storage compensation power value of the fluctuation quantity,and the fluctuation stability of output power of new energy resources is realized; and the fluctuation quantity meets the requirement of the grid-connected indexes, optimal configuration calculationof the energy storage power and capacity is realized, so that energy storage configuration power capacity is minimized, the power value do not meet fluctuation indexes is compensated, the power valuemet the condition is not aff