1.Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network (Wuhan University), Wuhan 430072, China;2.School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China;3.China Electric Power Research Institute, Beijing 100192, China

Hydrogen production from renewable energy, such as wind power, is an effective technical means to improve the accommodation capability for renewable energy. A power coordinated control method for DC microgrid with hydrogen-storage-wind power considering optimized operation requirements of hydrogen production efficiency is proposed, which can adapt to the wind power and load power fluctuations and ensure the efficient operation of the hydrogen production electrolyzer. According to the optimized operation area of the hydrogen production electrolyzer and the range of DC bus voltage fluctuations, the DC microgrid is divided into normal operation modes (i.e., optimized operation of hydrogen production electrolyzer) and extreme operation modes (i.e., non-optimized operation of hydrogen production electrolyzer). In the normal operation modes, the operation point of the electrolyzer is maintained within the optimized operation area through the self-adaptive droop control of the electrolyzer and the variable coefficient droop control with a virtual capacitor of the battery energy storage to ensure the efficient and safe operation of the electrolyzer. In the extreme operation modes, the voltage safety of the DC microgrid is assured through flexible switching control strategies of hydrogen and storage. The proposed coordinated control method can not only rapidly suppress the DC bus voltage fluctuations caused by the wind power and load power fluctuations, but also maintain the hydrogen production efficiency at a high level. Finally, the effectiveness and superiority of the proposed method are verified through simulation cases of PSCAD/EMTDC.

This work is supported by National Natural Science Foundation of China-State Grid Joint Fund for Smart Grid (No. U2166206).