高压直挂大容量电池储能系统电池簇故障容错运行控制策略  

Battery Clusters Fault Tolerance Operation Control Strategy for High-voltage Transformerless Large-capacity Battery Energy Storage System

作　　者：吴西奇 黄超 刘畅[1] 李睿[1] 蔡旭[1] WU Xiqi;HUANG Chao;LIU Chang;LI Rui;CAI Xu(Key Laboratory of Control of Power Transmission and conversion,Ministry of Education(Shanghai Jiaotong University),Minhang District,Shanghai 200240,China;Hainan Jinpan Intelligent Technology Co.,Ltd.,Haikou 541004,Hainan Province,China)

机构地区：[1]电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市闵行区200240 [2]海南金盘智能科技股份有限公司,海南省海口市541004

出　　处：《中国电机工程学报》2024年第16期6470-6481,I0015,共13页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家自然科学基金项目(51837007,52177187)。

摘　　要：高压直挂电池储能系统采用H桥电路级联方法升高电压后接入电网,将电池簇分散接入级联H桥变换器直流侧,具有高度模块化结构,对比低压方案具有单机容量大、效率高、响应速度快等明显优势。锂电池作为高能量密度储能介质,系统安全稳定运行高度依赖电池芯的可靠性。传统电池簇容错控制通过设置交流旁路开关直接实现整个子模块切除,该策略不仅需要额外增加多个冗余模块,增加了储能成本,且调制比限制使故障电池簇退出数量有限,系统容量利用率不高。该文所提电池簇容错策略通过直流断路器切除故障电池簇后,将故障子模块由有功充放电模式切换至无功容错模式继续运行,充分发挥故障模块的电网电压支撑能力。所提控制策略能实现任意数量电池簇退出,剩余电池簇仍可继续存储或释放能量,提升了系统容量利用率。The high-voltage transformer-less battery energy storage system(BESS)adopts the concept of cascading H-bridge circuits to connect the high-voltage power grid.A large number of battery cells are separated equally into numerous clusters at the DC side of H-bridge submodules,and a high degree of modularity features the BESS.Compared with the low-voltage solution,it has obvious advantages,such as a larger capacity for a single machine,higher efficiency,and faster response speed.As a high energy density energy storage medium,the safe and stable operation of lithium battery highly depends on the reliability of battery core.In the traditional fault-tolerant control of battery cluster,the whole submodule is removed by setting AC bypass switch directly.This strategy requires additional redundant modules,which increases the energy storage cost.Due to the limitation of modulation ratio,the number of modules exiting the battery cluster fault is limited,and the capacity utilization rate of the system is not high.In this paper,the fault-tolerant strategy of battery cluster is proposed to remove the faulty battery cluster by DC circuit breaker,and switch the faulty module from the active charge-discharge mode to the reactive fault-tolerant mode,so as to give full play to the power grid voltage support capability of the faulty module.The proposed control strategy can realize the withdrawal of any number of modules,and other sub-modules can continue to store or release energy,which is of great significance to improve the utilization rate of system capacity at the end of charge and discharge.

关 键 词：高压直挂 锂电池 储能系统 故障切除 容错运行 

分 类 号：TM76[电气工程—电力系统及自动化]