The invention relates to a system-control-requirement-oriented energy storage system optimum allocation method. The method is characterized by comprising the following steps: from the angle of power imbalance of wind power on the whole power grid, controlling the output power of a wind power plant group to not exceed the power balance target of the whole power grid, setting a discharge interval of the energy storage system in the residual power grid utilization space, performing optimal management on the energy of the energy storage system based on the SOC hierarchical control strategy, correcting the charge and discharge power of the energy storage system in real time, optimizing the working performance of the energy storage system, establishing a wind storage operating economy evaluation model, taking the maximum comprehensive income as a target, and determining the optimum discharge interval of the energy storage system. The capacity of the energy storage system is optimized, the service life of the energy storage system is prolonged, the grid-connected scale of new energy power is improved, and the acceptable wind-power space of the power grid is effectively utilized.