基于模块化理论的数字储能系统优化设计  

Optimization design of digital energy storage system based on modularization theory

作　　者：王东 王林飞 WANG Dong;WANG Lin-fei

机构地区：[1]中国三峡新能源(集团)股份有限公司建设管理分公司,内蒙古乌兰察布011800

出　　处：《节能》2023年第10期20-24,共5页Energy Conservation

摘　　要：从技术路线方面对数字储能系统进行整体优化设计。一方面通过引入模块化理论,基于高频开关器设备和能量感应系统,将电池管控颗粒度从模组级细化为能量切片;另一方面以能量交换系统(DESS)代替传统数字储能的电池管理系统(BMS),将电池单元由传统固定串并联结构演进为电池矩阵网络化互联成组结构。通过锂电池热失控研究、锂电池电芯加热实验以及强制过充实验对上述优化方案的本质安全进行验证,并分析50 MW/100 MWh磷酸铁锂电池系统的应用效果。结果表明:磷酸铁锂电芯在到达自发热起点温度的窗口期或因外界因素导致电芯温度升高到达临界点的窗口期,单体电池电压上升最高点的窗口期,对电芯进行提前预警和快速隔离可以有效防止电芯热失控的发生。在具体实施过程中,优化方案提高了大规模电池储能系统的循环寿命、安全性、可靠性和有效容量,而且具备毫秒级电池网络拓扑可重构能力和工作电流级的均衡能力,并基于云技术实现了高效自动运维巡检功能。The overall optimization design of digital energy storage system is carried out from the technical route.On the one hand,the particle size of battery control is refined from module level to energy slice based on the introduction of modularization theory and high-frequency switch equipment and energy sensing system.On the other hand,the energy exchange system(DESS)is used to replace the traditional battery management system(BMS)for digital energy storage,and the battery cell is evolved from the traditional fixed series parallel structure to the battery matrix network interconnection group structure.The intrinsic safety of the above optimization scheme is verified from the research of lithium battery thermal runaway,lithium battery cell heating experiment and forced overcharge experiment,and a 50 MW/100 MWh lithium iron phosphate battery system is specifically implemented.The results show that early warning and rapid isolation of lithium iron phosphate battery cells can effectively prevent the occurrence of thermal runaway of battery cells during the window period when they reach the self heating starting point temperature,the window period when the battery cell temperature rises to the critical point due to external factors,and the window period when the cell voltage rises to the highest point.In the specific implementation process,the optimization scheme improves the cycle life,safety,reliability and effective capacity of the large-scale battery energy storage system.The battery energy storage system has the ability to reconfigure the millisecond level battery network topology and balance the working current level,and realizes the efficient automatic operation and maintenance patrol function based on cloud technology.

关 键 词：数字储能 模块化理论 能量交换系统 

分 类 号：TM73[电气工程—电力系统及自动化]