Study on Energy Allocation Strategy of Multiple Electrolyzers for Renewable Energy-Based Hydrogen Production System

Abstract In the context of the Carbon Peaking and Carbon Neutrality Goals, the utilization of renewable energy to produce hydrogen by water electrolysis is of great significance as it can solve the problems of renewable energy consumption and large-scale green hydrogen production. However, the renewable energy-based hydrogen production system faces many problems such as large fluctuation of renewable energy and high cost of hydrogen production. Therefore, this study proposes an average power strategy to enhance the system economy without significant improvement in the performance and cost of the existing power system and electrolyzers. Firstly, the wind-hydrogen capacity ratio is caried out, and according to the real data of a wind fam in Qinghai, a reasonable number of 1,000 standard cubic meters of alkaline electrolyzers is configured. Subsequently, the objective function is developed with economy as the main goal and considering the lifetime of the electrolyzer. Finally, the average power strategy and the common rated power strategy are introduced in detail, and they are compared through example analysis. The results show that, compared with the rated power strategy, the average power strategy improves the economic efficiency, renewable energy consumption rate, and the consistency of the electrolyzer lifetime.