负载不平衡交流侧离网MMC-BESS相间均衡控制  

Interphase energy balance control of off-grid MMC-BESS under unbalanced load

作　　者：杨海涛 窦真兰 江晶晶 陈婧 韩冬 徐瀚诚 YANG Haitao;DOU Zhenlan;JIANG Jingjing;CHEN Jing;HAN Dong;Xu Hancheng(State Grid Shanghai Electric Power Company Shibei Power Supply Company,Shanghai 200072,China;State Grid Shanghai Comprehensive Energy Service Company,Shanghai 200023,China)

机构地区：[1]国网上海市电力公司市北供电公司,上海200072 [2]国网上海综合能源服务有限公司,上海200023

出　　处：《电气应用》2023年第1期21-25,共5页Electrotechnical Application

摘　　要：建立了交流侧离网的模块化多电平电池储能系统(MMC-BESS)的电压控制模型,分析了在三相负载不平衡导致的MMC-BESS三相荷电状态(SOC)不均衡的问题,提出一种MMC-BESS相间能量均衡控制方法。该方法实时检测负载侧的负序电流,计算三相不平衡功率,据此调整三相直流电流的分配,使三相电池输出功率平衡,避免因三相负载不平衡导致三相电池SOC偏差。仿真结果验证了三相负载不平衡的离网MMC-BESS能量均衡控制策略的正确性。The voltage control model of off grid MMC-BESS at AC side is established, the three-phase SOC imbalance of MMC-BESS caused by three-phase load imbalance is analyzed, then a phase to phase energy balance control method of MMC-BESS is proposed. This method detects the negative sequence current at the load side in real time, calculates the three-phase unbalanced power, and adjusts the distribution of the three-phase DC current to balance the output power of the three-phase battery, so as to avoid the SOC deviation of the three-phase batteries caused by the three-phase load imbalance. The simulation results verify the correctness of the off grid MMC-BESS energy balance control strategy with three-phase unbalanced load.

关 键 词：模块化多电平电池储能系统 交流侧模型 三相不平衡 直流功率分配 SOC均衡 

分 类 号：TM91[电气工程—电力电子与电力传动]