电气工程学报 ›› 2020, Vol. 15 ›› Issue (3): 31-37.doi: 10.11985/2020.03.004

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考虑超级电容器荷电状态的混合储能系统能量管理策略*

韩东旭(),赵凯,刘鑫,由蕤()   

  1. 青岛大学电气工程学院 青岛 266071
  • 收稿日期:2020-07-08 修回日期:2020-07-30 出版日期:2020-09-25 发布日期:2020-10-28
  • 作者简介:韩东旭,男,1994年生,硕士研究生。主要研究方向为交直流微电网控制。E-mail:1035182192@qq.com|由蕤,男,1984年生,博士,副教授。主要研究方向为分布式发电与微电网。E-mail:yourui1984@163.com
  • 基金资助:
    * 山东省重点研发计划(重大科技创新工程)(2019JZZY010902);电力系统国家重点实验室资助课题(SKLD20M18)

Energy Management Strategy of Hybrid Energy Storage System Considering the State of Charge of the Supercapacitor

HAN Dongxu(),ZHAO Kai,LIU Xin,YOU Rui()   

  1. College of Electrical Engineering, Qingdao University, Qingdao 266071
  • Received:2020-07-08 Revised:2020-07-30 Online:2020-09-25 Published:2020-10-28

摘要:

以直流微电网为研究对象,介绍了一种混合储能系统的能量管理策略。为了降低由于负载变化引起的功率波动,优化混合储能系统的运行,提出了一种考虑超级电容器荷电状态的能量管理策略。该策略根据实测超级电容器荷电状态,采用时间常数随超级电容器荷电状态变化的低通滤波算法,将波动功率在两种储能介质之间进行分配。由蓄电池承担波动功率的低频部分,超级电容器承担其高频部分。在Matlab/Simulink中搭建仿真模型,并对所提出的能量管理策略进行仿真验证。结果表明,该方法能有效解决由于储能设备的过度充/放电而导致系统不能正常稳定运行的问题。

关键词: 微电网, 混合储能, 荷电状态, 能量管理

Abstract:

DC microgrid is taken as the research object, and an energy management strategy of hybrid energy storage system is introduced. In order to reduce power fluctuations caused by load variation and optimize the operation of hybrid energy storage system, an energy management strategy for the state of charge of supercapacitor is proposed. According to the measured state of charge of supercapacitor, the low-pass filtering algorithm with time constant varying with the state of charge is used to distribute the fluctuating power between the two energy storing dielectrics. The low frequency part of the fluctuating power is undertaken by the battery, while the high frequency part is undertaken by the supercapacitor. The simulation model is built in Matlab/Simulink, and the proposed energy management strategy is verified by simulation. The results show that the method can effectively solve the problem that the system cannot operate normally and stably due to the excessive charge/discharge of energy storage equipment.

Key words: Microgrid, hybrid energy storage, state of charge, energy management

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