Optimal Allocation of Energy Storage Capacity for Stabilizing Wind Power Fluctuation

Given the impact of wind power output fluctuation on power grid, energy storage system (ESS) is used to smooth wind power fluctuation and effectively improve the power quality and utilization rate of wind power system. How to allocate the minimum the ESS capacity to smooth the wind power fluctuation has become a hot issue because of the high price of electric ESS. For the purpose of dealing with the time-delay of the existing low-pass filtering method in the optimal configuration of the ESS capacity, this paper proposes an optimal allocation method of the ESS capacity based on zero phase low-pass filtering method. When the zero-phase low-pass filter is used to eliminate the delay, the capacity and cost of the ESS can be significantly reduced under the condition that the wind power grid-connected fluctuation constraint is satisfied. Finally, taking the measured wind speed data of a wind farm as an example, this paper compares the common low-pass filtering method and the zero phase low-pass filtering method, which show the validity of the improved method proposed.