To avoid the overuse and prolong the lifetime of distributed energy storage units (DESUs), the state of charge (SOC) management of DESUs cannot be ignored. The conventional control method will cause unnecessary charge and discharge between units. And it suffers from frequency and voltage deviation as well as inaccurate reactive power allocation when time delays exist. To address those problems, a distributed cooperative control based on PI consensus algorithm is proposed for DESUs in this paper. Two controllers are designed, where one combines the SOC management with frequency recovery and the other incorporates the reactive power management with voltage recovery. The small-signal stability analysis is conducted to prove the stability of the proposed control strategy. And Simulations verify its effectiveness.