储能科学与技术 ›› 2021, Vol. 10 ›› Issue (6): 2283-2292.doi: 10.19799/j.cnki.2095-4239.2021.0095

• 储能系统与工程 • 上一篇    下一篇

基于多分支拓扑的梯次利用储能系统电池同期退役协同控制策略

郑永强1(), 吴越2, 张盼盼1, 雷博2, 郑耀东3   

  1. 1.珠海瓦特电力设备有限公司,广东 珠海 519080
    2.南方电网科学研究院有限责任公司,广东 广州 510080
    3.中国南方电网有限责任公司,广东 广州 510663
  • 收稿日期:2021-03-10 修回日期:2021-03-27 出版日期:2021-11-05 发布日期:2021-11-03
  • 通讯作者: 郑永强 E-mail:watt_ky@163.com
  • 作者简介:郑永强(1977—),男,工程师,研究方向为低压直流、自动控制技术,E-mail:watt_ky@163.com
  • 基金资助:
    国家重点研发计划项目(2018YFB0905300)

Research on collaborative control strategy for simultaneous decommissioning based on multi-branch PCS topology of ESS using second-life EV batteries

Yongqiang ZHENG1(), Yue WU2, Panpan ZHANG1, Bo LEI2, Yaodong ZHENG3   

  1. 1.Zhuhai Watt Electrical Equipment Co. , Ltd. , Zhuhai 519080, Guangdong, China
    2.Electric Power Research Institute, China Southern Power Grid, Guangzhou 510080, Guangdong, China
    3.China Southern Power Grid, Guangzhou 510663, Guangdong, China
  • Received:2021-03-10 Revised:2021-03-27 Online:2021-11-05 Published:2021-11-03
  • Contact: Yongqiang ZHENG E-mail:watt_ky@163.com

摘要:

针对退役动力电池储能系统中不同电池簇间的同期退役问题,提出了一种基于多分支拓扑的同期退役协同控制策略。该策略针对不同时段的功率需求,根据储能系统中电池健康状态(SOH)的失衡度,首先选择电池健康状态较好的电池簇优先出力或者使所有电池簇共同出力的模式,并根据电池簇荷电状态(SOC)分布情况,采用基于实时可变电流作为正反馈调节值的控制策略,实现储能系统中各电池簇间协同控制与平衡出力。经过多次充/放电过程,各电池簇的健康状态(SOH)将渐进趋于一致,进而实现不同电池簇同期退役的目的。最后,通过MATLAB软件进行仿真分析,验证了该策略可以使储能系统中各退役动力电池簇实现同期退役。

关键词: 退役动力电池, 同期退役, 健康状态, 荷电状态, 多分支协同控制

Abstract:

A coordinated control strategy based on a multi-branch power conversion system (PCS) topology was designed to address the problem of simultaneous decommissioning among different battery modules in an energy storage system (ESS) using second-life electric vehicle (EV) batteries. Considering the power demand in different periods and the imbalance degree of battery state of health (SOH) in ESS, the priority output mode to utilize batteries with better health status or common output mode of the entire battery group was selected. Based on the distribution of battery state of charge (SOC), a control strategy employing real-time variable current as a positive feedback regulation value was used to achieve coordinated control and output balancing within the ESS's battery cluster. After multiple charges and discharges, the SOH of each battery module in one cluster tends to be asymptotically consistent, thus achieving the goal of decommissioning different batteries simultaneously. Finally, the simulation analysis confirmed that the strategy could simultaneously decommission each retired power battery pack in the energy storage system.

Key words: second-life batteries, simultaneous decommissioning, state of health, state of charge, multi-branch collaborative control

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