Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2025 , Vol. 59 >Issue 9: 1370 - 1382

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2023.516

New Type Power System and the Integrated Energy

Secondary Frequency Modulation Strategy of Composite Energy Storage Based on Variable Filter Time Constant and Fuzzy Control

  • ZHANG Shipeng ,
  • LI Peiqiang ,
  • ZHANG Yijun ,
  • LIU Xifeng
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  • 1 College of Electrical Engineering and Physics, Fujian University of Technology, Fuzhou 350118, China
    2 College of Electrical and Information Engineering, Hunan University, Changsha 410082, China

Received date: 2023-10-12

  Revised date: 2023-11-20

  Accepted date: 2023-12-20

  Online published: 2024-01-02

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Abstract

In a composite energy storage system, coordinating the operation of different types of energy storage is an important approach to enhancing frequency regulation performance. To fully tap the potential of energy storage for frequency modulation, this paper proposes a secondary frequency modulation strategy based on a hybrid system combining battery energy storage and pumped hydro storage. To address the limitation of traditional first-order low-pass filter with fixed cutoff frequencies, it proposes a dynamic adjustment method for the filter time constant based on frequency variation, enabling flexible allocation of modulation commands in the composite storage system. During frequency modulation, it designs a dual fuzzy control strategy to coordinate battery energy storage and pumped hydro storage, taking into account the state of charge (SOC) constraint of the battery. During non-frequency modulation, it constructs the SOC self-recovery curve of the battery using the logistic function, and utilizes the remaining capacity of the pumped hydro storage to restore the battery SOC. Simulation analyses under two typical working conditions show that the proposed strategy has advantages in improving frequency modulation performance and maintaining the SOC of the battery energy storage system.

Key words： second frequency modulation; composite energy storage; variable filter time constant; fuzzy control; state of charge (SOC)

Cite this article

ZHANG Shipeng , LI Peiqiang , ZHANG Yijun , LIU Xifeng . Secondary Frequency Modulation Strategy of Composite Energy Storage Based on Variable Filter Time Constant and Fuzzy Control[J]. Journal of Shanghai Jiaotong University, 2025 , 59(9) : 1370 -1382 . DOI: 10.16183/j.cnki.jsjtu.2023.516

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