基于SOC恢复柔性功率备用的光伏-电池储能系统频率稳定支撑能量管理策略

The reduced frequency regulation capability in low-inertia power systems necessitates enhanced frequency support from photovoltaic(PV)systems.However,the regulation capa-bility of PV system under conventional control scheme is limit-ed,which requires flexible power control and support from bat-tery energy storage systems(BESSs).This paper proposes an energy management strategy of PV-BESS to provide stable fre-quency support to the grid.The proposed strategy initially de-velops a maximum power point tracking(MPPT)-based power reserve control(PRC)for PV power reserve.At this stage,the BESS is manipulated to buffer the power fluctuations caused by MPPT execution and environmental variability.To enhance the regulation capability of BESS and mitigate battery aging,the proposed strategy incorporates a flexible PRC for state of charge(SOC)recovery.Subsequently,the battery can be ratio-nally charged or discharged during the PRC process to main-tain SOC.Simulation results obtained from MATLAB/Simulink and experimental results from the StarSim platform validate that the proposed strategy achieves stable PV power reserve,mitigates fluctuations induced by environmental uncertainties,enables efficient SOC recovery,and improves grid frequency quality.Overall,the proposed strategy ensures stable operation of PV-BESS both under steady-state conditions and during fre-quency events.