本发明涉及一种利用退役电池组的混合型储能系统及其控制方法，其包括：最小储能系统、退役电池组和双向电源变换器；最小储能系统包括功率变换单元、能量管理单元和储能电池组；功率变换单元的直流侧分别与储能电池组的输出以及双向电源变换器的高压侧相连，功率变换单元的交流侧作为混合型储能系统的输出端并入用户侧电网；双向电源变换器的低压侧与退役电池组的输出相连，用于在混合型储能系统的不同工作模式中对退役电池组进行充电或放电管理；能量管理单元用于根据用户侧电网负载功率需求以及退役电池组和储能电池组的电量状态，决定混合型储能系统的工作模式为“放电模式”或“充电模式”。本发明可以广泛应用于储能系统设计领域。

The invention relates to a hybrid energy storage system utilizing a decommissioned battery pack and a control method thereof, including a minimum energy storage system, a decommissioned battery pack and a bidirectional power converter; The minimum energy storage system includes power conversion unit, energy management unit and energy storage battery pack. The DC side of the power conversion unit is connected to the output of the energy storage battery pack and the high voltage side of the bidirectional power converter respectively. The AC side of the power conversion unit is integrated into the power grid of the user side as the output end of the hybrid energy storage system. The low voltage side of the bidirectional power converter is connected with the output of the decommissioned battery pack, which is used to manage the charge or discharge of the decommissioned battery pack in different working modes of the hybrid energy storage system. The energy management unit is used to determine the working mode of the hybrid energy storage system as "discharge mode" or "charge mode" according to the load power demand of the grid at the user side and the power state of the retired battery pack and the energy storage battery pack. The invention can be widely used in the field of energy storage system design.