Abstract: As one of the main forms of energy in the future, hydrogen has been widely used in social production. Using new energy to produce hydrogen on a large scale is an important technical means to achieve new energy consumption and clean energy utilization. Aiming at the optimization operation of a large-scale intermittent new energy hydrogen production system, a start-stop feature based on electrolyzers is proposed. Day-a-day efforts to optimize the model. Considering real-time electricity price changes, the operating status of multiple electrolyzers, and the intermittentness of new energy sources, and satisfying constraints such as power balance constraints and electrolyzer production constraints, a day-ahead output optimization model of the hydrogen production system with the lowest system operating cost was established. Using actual wind-solar output data and equivalent hydrogen load characteristic data, four different scenarios were constructed to formulate a day-a-day output plan. The results show that the proposed optimized operation strategy can realize the safe and stable operation of the system and avoid large-scale purchase of electricity and alkali at peak electricity prices. The repeated start and stop of the electrolytic cell reduces the operating cost of the system and verifies the correctness of the proposed method.

Key words: hydrogen, new energy sources, alkaline electrolytic cell, start-stop characteristics, day-ahead plan