发电技术 ›› 2025, Vol. 46 ›› Issue (4): 788-796.DOI: 10.12096/j.2096-4528.pgt.24010

• 大规模新能源并网运行调控关键技术 • 上一篇    下一篇

计及荷电状态的并网型直流微电网功率协同控制策略

卫广宇1, 应笑冬1, 姚延军1, 杨小芳1, 翁楚迪2, 彭勇刚2, 李海龙1   

  1. 1.宁波经济技术开发区北仑电力实业有限责任公司,浙江省 宁波市 315825
    2.浙江大学电气工程学院,浙江省 杭州市 310027
  • 收稿日期:2024-01-15 修回日期:2024-05-26 出版日期:2025-08-31 发布日期:2025-08-21
  • 通讯作者: 彭勇刚
  • 作者简介:卫广宇(1985),男,高级工程师,从事电力调度自动化研究,187150070@qq.com
    彭勇刚(1978),男,博士,教授,从事分布式发电、智能电网研究,本文通信作者,pengy@zju.edu.cn
  • 基金资助:
    国家自然科学基金项目(51877188┫┣KJXM2022023)

Power Coordinated Control Strategy for Grid-Connected DC Microgrid Considering State of Charge

Guangyu WEI1, Xiaodong YING1, Yanjun YAO1, Xiaofang YANG1, Chudi WENG2, Yonggang PENG2, Hailong LI1   

  1. 1.Ningbo Economic-Technological Development Area Beilun Electric Power Industry Co. , Ltd. , Ningbo 315825, Zhejiang Province, China
    2.School of Electrical Engineering, Zhejiang University, Hangzhou 310027, Zhejiang Province, China
  • Received:2024-01-15 Revised:2024-05-26 Published:2025-08-31 Online:2025-08-21
  • Contact: Yonggang PENG
  • Supported by:
    National Natural Science Foundation of China(51877188);Science and Technology Project of Ningbo Yongyao Electric Power Investment Group Co., Ltd(KJXM2022023)

摘要:

目的 现有关于分散式协同控制策略的研究主要针对直流微电网内部的功率分配展开,而较少考虑直流微电网并网运行的情况。对此,提出一种计及荷电状态(state of charge,SOC)的并网型直流微电网功率协同控制策略。 方法 所提策略将互联变换器视作一个可调度的资源,基于直流母线电压调节储能单元和互联变换器的输出功率,并限制母线电压和储能单元SOC在允许范围内。 结果 根据Simulink仿真结果,所提策略能够实现储能单元和互联变换器之间的分散式功率协同和储能单元之间的SOC均衡,并避免电压越限和储能单元过充过放的情况出现。 结论 所提控制策略能够在并网型直流微电网内实现合理的功率分配,保证系统的稳定运行。

关键词: 直流微电网, 协同控制策略, 分散式控制, 功率分配, 储能单元, 荷电状态(SOC)均衡

Abstract:

Objectives Existing research on decentralized coordinated control strategies mainly focuses on power distribution within DC microgrid, with limited consideration given to the operation of grid-connected DC microgrids. To address this, a power coordinated control strategy for grid-connected DC microgrids, considering the state of charge (SOC), is proposed. Methods The proposed strategy treats the interconnecting converter as a dispatchable resource. It regulates the output power of the energy storage unit and interconnecting converter based on the DC bus voltage while keeping the bus voltage and SOC of the energy storage unit within allowable limits. Results The proposed strategy can achieve decentralized power coordination between the energy storage unit and the interconnecting converter, as well as SOC balancing among energy storage units. It also prevents overvoltage and overcharge/overdischarge conditions for the energy storage units. Conclusions The proposed control strategy ensures reasonable power distribution in grid-connected DC microgrids and guarantees the stable operation of the system.

Key words: DC microgrid, coordinated control strategy, decentralized control, power distribution, energy storage unit, SOC balancing

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