The controllability of energy storage system provides a new solution to improve power supply capability with random fluctuation power source. The research takes DG’s volatility and intermittent into account. According to the fuzzy goal theory, the power supply capability is mainly analyzed. To improve the power supply capability, load flow distribution, energy storage substation operating parameters, and electric quantity are taken as constraint conditions for building optimized model for energy storage power and a multi-level & multi-objective dynamic optimization method to achieve energy storage power modification is proposed. Calculation results of cases confirm the effectiveness and objectivity of the proposed method.