MMC电池储能系统直流侧三级能量均衡控制

DC Side Three-level Energy Balance Control of MMC Battery Energy Storage System

为了保障电池储能系统的安全高效运行,需要对电池进行均衡。提出了基于能量偏差对模块化多电平电池储能系统(modular multilevel converter based battery enegy storage system,MMC-BESS)进行均衡控制,适用于梯次电池和电池混用的场合。首先,根据电池的充放电状态进行系统功率分配;然后通过相间均衡、子模块均衡和桥臂均衡实现了系统的三级均衡控制;最后,在试验样机上进行测试,得到的相关物理量波形验证了三级均衡中各个控制方法的适用性。测试结果验证了MMC-BESS三级均衡控制策略的正确性。

The three-level energy balance control on the DC side of the MMC battery energy storage system is for the safe and efficient operation of the battery energy storage system,so it is necessary to balance the battery.A balanced control of MMC-BESS based on energy deviation was proposed,which was suitable for the situation of mixed use of cascade battery and battery.First,the system power was distributed according to the charge and discharge state of the battery;then the three-level equalization control of the system was realized by phase to phase equalization,sub module equalization and bridge arm equalization;finally,the test was carried out on the experimental prototype,and the relevant physical quantity waveforms obtained can verify the applicability of each control method in the three-level equalization.The test results verify the correctness of the MMC-BESS three-level equalization control strategy.