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

Article retrieval

文章检索

首页 >> 文章检索 >> 最新索引

基于FSBB变换器的直流微电网SOC 平衡控制策略

来源:电工电气发布时间:2024-04-07 10:07 浏览次数:28

基于 FSBB 变换器的直流微电网 SOC 平衡控制策略

张晨辉,李海啸,郭强
(重庆理工大学 电气与电子工程学院,重庆 300054)
 
    摘 要:针对直流微电网工作时易出现储能单元 SOC 不平衡的现象,提出一种基于四开关 Buck-Boost(FSBB) 变换器的直流微电网 SOC 平衡控制策略。使用四开关 Buck-Boost 变换器替换双向 DC/DC 变换器与蓄电池相联,既保证功率可以双向流通,又提高储能单元动态响应能力和抗干扰能力;设计了一种基于储能单元 SOC 平衡的改进下垂控制策略,将蓄电池 SOC 函数与下垂系数相结合,使各储能单元在充放电过程中按 SOC 值分配输出电流,实现储能单元 SOC 平衡和单元间电流合理分配;同时负载跳变时保持母线电压稳定,实现不同模式的平滑切换与功率分配,且无需互联通信,降低系统设计成本。在 MATLAB/Simulink 中搭建仿真模型,验证了所提控制策略的正确性和可行性。
    关键词: 直流微电网;储能单元;SOC 平衡;四开关 Buck-Boost 变换器;下垂控制
    中图分类号:TM46     文献标识码:A     文章编号:1007-3175(2024)03-0029-09
 
SOC Balance Control Strategy for DC Microgrid Based on FSBB Converter
 
ZHANG Chen-hui, LI Hai-xiao, GUO Qiang
(School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 300054, China)
 
    Abstract: To address the phenomenon that the SOC imbalance of the energy storage unit is easy to occur when the DC microgrid is working,a DC microgrid SOC balance control strategy based on a Four Switch Buck-Boost (FSBB) converter is proposed. Firstly, the four-switch Buck-Boost converter is used to replace the bidirectional DC/DC converter and connect the battery, which not only ensures the bidirectional power flow, but also improves the dynamic response and anti-interference ability of the energy storage unit. Secondly, an improved droop control strategy based on SOC balance of energy storage units is proposed, which combines the battery SOC function with the droop coefficient to distribute output current according to SOC values during the charging and discharging process of each energy storage unit, achieving SOC balance of energy storage units and reasonable distribution of current between units. At the same time, the bus voltage is kept stable during load jumping, and the smooth handover and power distribution of different modes are realized, and there is no need for interconnection communication, which reduces the system design cost. Finally, a simulation model was built in MATLAB/Simulink to verify the correctness and feasibility of the proposed control strategy.
    Key words: DC microgrid; energy storage unit; SOC balance; four-switch Buck-Boost converter; droop control
 
参考文献
[1] 任小永, 唐钊, 阮新波, 等. 一种新颖的四开关 Buck-Boost 变换器[J] . 中国电机工程学报,2008,28(21) :15-19.
[2] 任小永,阮新波,李明秋,等. 双沿调制的四开关 Buck-Boost 变换器[J] . 中国电机工程学报,2009,29(12) :16-23.
[3] 任林涛,汪飞,肖杨婷,等. 四开关 Buck-Boost 变换器研究综述[J]. 电气工程学报,2023,18(2) :52-69.
[4] ZHOU Zongjie, LI Haiyan, WU Xinke.A constant frequency ZVS control system for the fourswitch Buck-Boost DC-DC converter with reduced inductor current[J].IEEE Transactions on Power Electronics,2019,34(7) :5996-6003.
[5] 杨晨,谢少军,毛玲,等. 基于双管 Buck-Boost 变换器的直流微电网光伏接口控制分析[J]. 电力系统自动化,2012,36(13) :45-50.
[6] 时颖,杭阿芳,田行璇,等. 直流微电网双向 Buck-Boost 变换器控制模型的研究[J]. 现代制造技术与装备,2022,58(6) :14-17.
[7] 陈洪涛,胡健,韩小雨,等. 直流微电网内 DC/DC 变换器非线性控制策略研究[J] . 现代电子技术,2019,42(4) :153-157.
[8] 卢昕,陈众励,李辉. 基于自抗扰控制的直流微电网双向 Buck-Boost 变换器控制策略研究[J]. 发电技术,2021,42(2) :193-200.
[9] 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.
[10] 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.
[11] 杨苓,罗安,陈燕东,等. 直流微电网双向储能变换器的两带通滤波器二次纹波电流抑制与均分控制方法[J].中国电机工程学报,2016,36(6) :1613-1624.
[12] XU Dezhi, XU Anjie, YANG Chengshun, et al.A novel double-quadrant SoC consistent adaptive droop control in DC microgrids[J].IEEE Transactions on Circuits and Systems Ⅱ :Express Briefs,2020,67(10) :2034-2038.
[13] LI Xin, ZHENG Taoyin, GUO Panfeng, et al.Decentralized multiple control for DC microgrid with hybrid energy storage[J].Journal of Electrical Engineering & Technology,2023,18(2) :1301-1311.
[14] THOGARU Ram Babu, MITRA Arghya.Regulation of DC microgrid voltage using optimized droop index control-based high gain converters in the presence of static and dynamic loads[J].Electrical Engineering,2022,104(3) :1649–1665.
[15] LI Qiang, ZHAO Feng, ZHUANG Li, et al.Research on the control strategy of DC microgrids with distributed energy storage[J].Scientific Reports,2023,13(1) :20622.
[16] QI Nan,FANG Wei,WANG Wei,et al.SoC balancing method for energy storage systems in DC microgrids using simplified droop control[J].Journal of Power Electronics,2021,21(8) :1200-1212.
[17] 方炜, 齐楠, 仇锐, 等. 低压直流微电网的改进 SoC 均衡控制研究[J] . 电子科技大学学报,2021,50(6) :947-953.
[18] 刘洪硕,罗向阳,张伟,等. 考虑蓄电池 SOC 的直流微电网协调控制策略研究[J] . 电气应用,2020,39(1) :16-23.
[19] 代广贵,何晋,张博嘉. 考虑不同容量的储能 SOC 均衡与功率分配策略[J]. 电力建设,2023,44(6) :12-22.
[20] 张汀,雷勇,王小昔. 考虑 SOC 均衡的直流微网储能系统控制策略研究[J] . 电源技术,2023,47(8) :1099-1104.