考虑电池SOC均衡的直流电网储能  

Direct current grid energy storage considering SOC balance of batteries

作　　者：曾繁礼 王玮伦 ZENG Fanli;WANG Weilun(Longyuan(Beijing)New Energy Engineering Technology Co.,Ltd.,Beijing 100089,China;College of Automation&College of Artificial Intelligence,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210023,China)

机构地区：[1]龙源(北京)新能源工程技术有限公司,北京100089 [2]南京邮电大学自动化学院、人工智能学院,江苏南京210023

出　　处：《电池》2024年第6期782-787,共6页Battery Bimonthly

基　　金：国家自然科学基金项目(GZ221047)。

摘　　要：随着直流电网中的模块多级串联储能设备的实用化,对串联子模块的可靠性要求日益提高。与传统的电压源换流器(VSC)换流站相比,多级串联式储能装备的可靠性取决于功率模块和电池的可靠性。通过运行试验模拟包含电池的子模块在实际运行中的工况,可对子模块设计的可靠性进行验证。首先,分析直流电网储能设备的拓扑结构和基本原理,介绍传统的通讯结构;然后,提出运行试验平台拓扑结构与逻辑控制方法,研究考虑阀塔子模块间的电池荷电状态(SOC)均衡的闭环电流控制策略,并对关键试验测试项目进行梳理;最后,在MATLAB-Simulink仿真平台上搭建电路模型。仿真结果显示:同一阀塔不同子模块之间的SOC差值在1%以内,满足阀塔长期大电流运行试验要求。With the practical application of module multi-level series energy storage devices in direct current power grids,the reliability requirements for series submodules are increasing day by day.Compared with traditional voltage source converter(VSC) converter stations,the reliability of multi-stage series energy storage equipment depends on the reliability of power modules and batteries.By simulating the operating conditions of sub-modules containing batteries through operational tests,the reliability of sub-module design can be verified.The topology and basic principles of direct current power grid energy storage equipment are firstly analyzed,the traditional communication structure is introduced.Then,the topology structure and logic control method of the operating test platform are proposed,a closed-loop current control strategy considering battery state of charge(SOC) balance between the valve tower sub-modules is studied.Key test items are sorted out.Finally,a circuit model is built on the MATLAB-Simulink simulation platform.The simulation results show that the SOC difference between different submodules of the same valve tower is within 1%,which meets the requirements of long-term high current operation test for valve tower.

关 键 词：直流电网 储能 运行试验 电池荷电状态(SOC)均衡 

分 类 号：TM912.9[电气工程—电力电子与电力传动]