Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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基于SOC 均衡的直流微电网储能单元鲁棒下垂控制方法

来源:电工电气发布时间:2022-11-26 11:26 浏览次数:181

基于SOC 均衡的直流微电网储能单元鲁棒下垂控制方法

杨子萱,曾进辉,何东
(湖南工业大学 电气与信息工程学院,湖南 株洲 412007)
 
    摘 要:由于各并联储能单元的线路参数、初始荷电状态 (SOC) 不相同,在系统运行时会导致不同储能单元的 SOC 不平衡,影响蓄电池寿命。提出一种基于 SOC 均衡的鲁棒下垂控制方法,以平衡各储能单元的充放电 SOC ,并克服线路阻抗对均衡的影响。该方法将直流下垂控制系数与蓄电池的 SOC 关联,使各个储能单元能根据其 SOC 动态调节负荷电流。同时利用直流母线公共点电压作为反馈信号,将各个储能单元的线路阻抗等效为储能变换器的部分输出阻抗,有效减小线路阻抗不匹配对负荷电流分配和 SOC 均衡精度的影响,并可实现直流母线电压的稳定。对系统进行了稳定性分析,确定了控制参数的选择范围,经 MATLAB/Simulink 软件仿真,结果验证了该方法的有效性。
    关键词: 直流微电网;分布式储能;SOC 均衡;下垂控制
    中图分类号:TM46 ;TM912     文献标识码:A     文章编号:1007-3175(2022)11-0001-10
 
A Robust Droop Control Method Based on SOC Balancing Control in
Energy Storage Unit of DC Microgrid
 
YANG Zi-xuan, ZENG Jin-hui, HE Dong
(College of Electrical and Information Engineering ,Hunan University of Technology, Zhuzhou 412007,China)
 
    Abstract: When the system operates, different line parameters and initial state of charge (SOC) of parallel distributed energy storage contribute to unbalanced SOC of different energy storage units, which reduces life of the battery. A robust droop control method based on SOC balancing control is proposed to balance the charging and discharging states of energy storage units and to overcome the influence of line impedance on balancing control. This method combines DC droop control coefficient with SOC of the battery to make every energy storage unit dynamically adjust the load current according to its SOC. Meanwhile, voltage of DC bus common point is used as the feedback signal to make line impedance of energy storage units equivalent to partial output impedance of energy storage converters, which effectively reduces the influence of line impedance mismatch on load current distribution and the accuracy of SOC balancing control and keeps the voltage of DC bus stable. After analyzing the system stability and determining the range of control parameters, a MATLAB/Simulink simulation model is built, and the results from the model verify the effectiveness of the method.
    Key words: DC microgrid; distributed energy storage; SOC balancing control; droop control
 
参考文献
[1] 杨新法,苏剑,吕志鹏,等. 微电网技术综述[J].中国电机工程学报,2014,34(1):57-70.
[2] 李霞林,郭力,王成山,等. 直流微电网关键技术研究综述[J] 中国电机工程学报,2016,36(1):2-17.
[3] 刘忠,杨陈,蒋玮,等. 基于一致性算法的直流微电网储能系统功率分配技术[J] . 电力系统自动化,2020,44(7):61-69.
[4] 谢文强,韩民晓,王皓界,等. 基于虚拟电压的直流微电网多源协调控制策略[J] . 中国电机工程学报,2018,38(5):1408-1418.
[5] DRAGICEVIC T,LU X N,VASQUEZ J C,et al.DC Microgrids—Part Ⅱ:A Review of Power Architectures,Applications,and Standardization Issues[J].IEEE Transactions on Power Electronics,2016,31(5):3528-3549.
[6] 朱晓荣,孟凡奇. 含虚拟惯性控制的直流微电网稳定性分析[J] . 电网技术,2020,44(1):208-216.
[7] 杨小龙,程启明,褚思远,等. 孤岛模式下光储直流微电网变功率控制策略[J] . 电力自动化设备,2016,36(11):67-74.
[8] 董继军,陈浩,周雪松,等. 直流微电网孤岛运行控制策略研究[J] . 电力系统保护与控制,2020,48(17):115-121.
[9] 米阳,蔡杭谊,宋根新,等. 考虑不匹配线阻的分布式储能单元荷电状态均衡研究[J] . 中国电机工程学报,2019,39(15):4441-4450.
[10] 田艳军,彭飞,朱晓荣,等. 直流微网储能单元的灵活类虚拟同步发电机控制[J] . 高电压技术,2020,46(7):2316-2326.
[11] 朱珊珊, 汪飞, 郭慧, 等. 直流微电网下垂控制技术研究综述[J] . 中国电机工程学报,2018,38(1):72-84.
[12] ZHI N,DING K,DU L,et al.An SOC-Based Virtual DC Machine Control for Distributed Storage Systems in DC Microgrids[J].IEEE Transactions on Energy Conversion,2020,35(3):1411-1420.
[13] 陆晓楠,孙凯,黄立培,等. 直流微电网储能系统中带有母线电压跌落补偿功能的负荷功率动态分配方法[J] . 中国电机工程学报,2013,33(16):37-46.
[14] LU X N,SUN K,GUERRERO J M,et al.State-of-Charge Balance Using Adaptive Droop Control for Distributed Energy Storage Systems in DC Microgrid Applications[J].IEEE Transactions on Industrial Electronics,2014,61(6):2804-2815.
[15] HU R,WEAVER W W . DC Microgrid Droop Control Based on Battery State of Charge Balancing[C]//2016 IEEE Power and Energy Conference at Illinois(PECI),2016:1-8.
[16] 杨捷,金新民,吴学智,等. 一种适用于直流微电网的改进型电流负荷分配控制策略[J] . 中国电机工程学报,2016,36(1):59-67.
[17] 李鹏程,张纯江,袁然然,等. 改进 SOC 下垂控制的分布式储能系统负荷电流分配方法[J] . 中国电机工程学报,2017,37(13):3746-3754.
[18] 米阳,蔡杭谊,袁明瀚,等. 直流微电网分布式储能系统电流负荷动态分配方法[J] . 电力自动化设备,2019,39(10):17-23.