Abstract: In order to solve the problem of battery consistency variation and overcharge/overdischarge caused by irregular charging and discharging of energy storage system, the consistency of lead carbon battery pack is studied and the power control strategy of energy storage system considering battery consistency is proposed. The proposed power control strategy is compared with the traditional strategy by using the actual operation data of grid-connected demonstration platform of centralized microgrid with common DC bus. The platform includes energy storage battery pack, wind/photovoltaic power generation, electric vehicles and conventional loads. The simulation results show that the proposed control strategy can effectively reduce the state of charge（SOC）range of battery pack, improve battery health and battery pack consistency, reduce the number of overdischarged batteries and enhance the bidirectional adjustment capability of energy storage system.