级联型电池储能电网不平衡下控制及故障保护  

Control and Fault Protection of Cascaded Battery Energy Storage Under Unbalanced Grid Conditions

作　　者：阎怀东 蔡立华 李官军 沙骏 YAN Huai-dong;CAI Li-hua;LI Guan-jun;SHA Jun(State Grid Yancheng Power Supply Company,Yancheng 224000,China;不详)

机构地区：[1]国网江苏省电力有限公司盐城供电分公司,江苏盐城224000 [2]中国电力科学研究院有限公司,江苏南京210003

出　　处：《电力电子技术》2021年第7期49-52,107,共5页Power Electronics

基　　金：国网江苏省电力公司科技项目(J2020013)。

摘　　要：级联型电池储能系统(BESS)基本的控制目标是充放电功率控制,调压、调频等高级控制策略均是在此基础上实现的。在级联型BESS中,每相N个电池模组分散接入H桥变换器的直流侧,电池容量能够得到充分利用的前提是各相内及相间电池组荷电状态(SOC)均衡。在电网电压出现不平衡或储能变流器(PCS)的模块出现故障时,仍需保证电池模组SOC均衡,以保证整个BESS仍能正常工作,从而提高系统的可靠性。The basic control goal of cascaded battery energy storage system(BESS)is charge and discharge power control,on which advanced control strategies such as voltage regulation and frequency modulation are realized.In the cascaded BESS,N battery modules in each phase are connected to the DC side of the H-bridge converter.The premise for the full utilization of the battery capacity is that the state of charge(SOC)of each phase and the inter phase battery pack are balanced.When the grid voltage is unbalanced or the power conversion system(PCS)module fails,it is still necessary to ensure that the battery module SOC is balanced to ensure that the whole BESS can still work normally,so as to improve the reliability of the system.

关 键 词：级联型电池储能系统 电网不平衡 故障保护 

分 类 号：TN86[电子电信—信息与通信工程]