Strategy of Hybrid Energy Storage to Stabilize Wind-PV Power Fluctuation Considering Battery SOC Safety Range

The randomness and intermittency of the output power of wind-PV system have a negative influence on power quality of local network. In order to solve this problem, the strategy of hybrid energy storage to stabilize wind-PV power fluctuation considering SOC safety range is proposed in this paper. The influence of different filter parameters on the output power is analyzed, the selection principle of filter parameters is proposed,and the generation diagram of power reference value with filter time constant that is online adjusted is given. In the end,through the simulation model of the wind-PV power system built by Matlab/Simulink simulation software, proposed leveling strategy is studied under different stages of SOC.And the feasibility and effectiveness of the proposed control method are verified by the simulation results.