Smooth control method for energy storage system

The invention discloses a smooth control method for an energy storage system. A sliding window is switched according to the fluctuation condition of real-time wind power, and the stable output of windpower is distinguished from the sudden change of wind power. The smoothing strategy can calculate the optimal solution of the fluctuation coefficients under two different working conditions and obtain a grid-connected power reference value, and the grid-connected power reference value is the optimal solution in statistical significance, so that the charging and discharging depth and the accumulated capacity are minimized. In order to consider both the smooth control effect and the influence of sudden power change on an energy storage battery, the grid-connected power reference value is corrected according to the grid-connected power fluctuation limit and the SOC level of the battery, so that the energy storage output is within a reasonable range. The provided control strategy can keep theoptimal smooth control ef