Journal of Northeastern University(Natural Science) ›› 2025, Vol. 46 ›› Issue (7): 30-36.DOI: 10.12068/j.issn.1005-3026.2025.20240184

• Industrial Intelligent Theory and Methods • Previous Articles     Next Articles

Optimal Control of Hydrogen Production by Renewable Energy Source Considering State of Charge of Energy Storage

Zhi-liang WANG, Liang-liang GUO, Xin-yu LI, Xin-rui LIU()   

  1. School of Information Science & Engineering,Northeastern University,Shenyang 110819,China.
  • Received:2024-10-18 Online:2025-07-15 Published:2025-09-24
  • Contact: Xin-rui LIU

Abstract:

An optimal control strategy considering the state of charge (SoC) of energy storage is proposed for an isolated DC microgrid for hydrogen production system composed of renewable energy, electrolytic cell, and energy storage equipment. Firstly, the characteristics of hydrogen production efficiency of alkaline electrolyzers are analyzed, and an optimal control method for adaptive adjustment of hydrogen production efficiency with bus voltage change is proposed. By coordinating with the energy storage system, the hydrogen production efficiency is kept within a high range. When the SoC of energy storage violates the upper and lower limits, a communication-independent SoC active recovery control strategy is designed to ensure the safe operation of the energy storage system. Secondly, a power coordinated control strategy considering extreme conditions is designed to ensure the stable operation of the DC microgrid through flexible switching between various operating modes. Finally, the effectiveness of the proposed control strategy is verified by MATLAB/Simulink simulation platform.

Key words: renewable energy source, DC microgrid, energy storage, state of charge(SoC), hydrogen production efficiency

CLC Number: