Research on the Control Strategy of the Battery Energy Storage System in Wind-Solar-Battery Hybrid Generation Station

In recent years, wind-solar-battery hybrid generation systems (WSBHGS) with large-scale battery energy system (BESS) have been proposed to integrate into power grids. To smooth the output power and improve the schedulability of the WSBHGS, the BESS control strategy is researched and a distributed control architecture of a two-level hierarchy is proposed, which is consisted of the top-level centralized controller and the local controller. The control strategies of the top-level controller including power correction strategy, power distribution strategy and state of charge (SOC) control strategy for battery are proposed to establish the active power reference of each battery energy storage equipment (BESE) of the BESS. The local controller uses the control of grid-connected converter of BESE to trace the power reference signals rapidly. The fluctuations of the output power of the WSBHGS are tested, and the effectiveness of the proposed BESS control strategy is demonstrated under different power generation schedules from the dispatching center.