With the rapid development and industrialization of the new energy storage technology, smoothing the fluctuations of nenewable power output by integrated mass storage unit becomes possible. Because of the allocation and internal resistance of battery energy storage system, a fully distributed optimization scheduling strategy based on multi-agent consensus algorithm which considered the internal resistance of the battery energy storage unit has been designed. By using a fully distributed algorithm, the power balance control of the power grid is realized by the real-time power allocation of the energy storage unit. The verification of each distributed strategy is realized through simulation analysis. The effectiveness and plug-and - play characteristic of the distributed consensus algorithm are verified by simulation results. The distributed consensus algorithm has good applicability for different communication topology.