孤岛模式下直流微网中储能单元SOC均衡控制策略
CSTR:
作者:
作者单位:

(中国石油大学(华东)新能源学院,山东 青岛 266400)

通讯作者:

董 磊(1979—),男,博士,讲师,主要从事电力电子与新能源发电技术等研究;E?mail:donglei@upc.edu.cn

中图分类号:

TM743

基金项目:

国家自然科学基金(52177203);中国石油大学(华东)研究生创新基金(CXJJ?2022?10)


Research on SOC balance control strategy of energy storage unit in DC microgrid in island mode
Author:
Affiliation:

(School of New Energy,China University of Petroleum (East China) ,Qingdao 266400,China)

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    摘要:

    储能单元作为直流微网系统重要的组成部分,关系到充放电过程中功率的合理分配和母线电压的持续稳定。然而对于含有多个分布式储能的直流微电网系统,SOC的不均衡必然会降低储能系统的可利用率,在不同工况下,为了保证系统正常稳定运行的同时能够实现储能单元SOC的快速均衡控制,首先,提出一种引入线路阻抗补偿前馈环节和动态调速因子的改进型下垂控制策略,消除分布式储能单元初始状态不一致和线路阻抗不同所带来的影响;然后,通过Matlab/Simulink搭建仿真平台实验,验证所提控制策略在不同充放电工况下运行的可行性和有效性;最后,得出结论:多种工况下相比于原有的控制策略,本文所提出的动态调速因子控制策略能够有效加快储能的均衡速度,并维持微电网系统的正常稳定运行。

    Abstract:

    As an important part of DC microgrid system, the energy storage unit is related to reasonable powerdistribution and continuous stability of bus voltage during charge and discharge process. However, for DC microgrid systems containing multiple distributed energy storage, the imbalance of SOC will inevitably reduce the availability of energy storage systems.In order to ensure the normal and stable operation of the system and realize the fast equalization control of the SOC of the energy storage unit under different working conditions, an improved droop control strategy is proposed by introducing line impedance compensation feedforward link and dynamic speed regulation factor to eliminate the impact of inconsistent initial states of the distributed energy storage units and different line impedance. After that, Matlab/Simulink was used to build a simulation platform experiment to verify the feasibility and effectiveness of the proposed control strategy under different charging and discharging conditions. Finally, it was concluded that compared with the original control strategy, the dynamic speed regulating factor control strategy proposed in this paper can effectively accelerate the energystorage balancing speed under various working conditions, and maintain the normal and stable operation of the microgrid system.

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明远山,胡慧慧,刘凯旋,等.孤岛模式下直流微网中储能单元SOC均衡控制策略[J].电力科学与技术学报,2023,38(4):57-64.
MING Yuanshan, HU Huihui, LIU Kaixuan, et al. Research on SOC balance control strategy of energy storage unit in DC microgrid in island mode[J]. Journal of Electric Power Science and Technology,2023,38(4):57-64.

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  • 在线发布日期: 2023-11-06
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