Abstract: In order to regulate coupling systems for renewable energy and fluctuating hydrogen demands based on fluctuating hydrogen requirements, a cooperative regulating model was proposed with the profile of renewable energy generation side adjusted by grid connection, and the profile of the hydrogen demand was adjusted by hydrogen utilities. Effects of variations of amplitude and period of hydrogen demand on the economy and design characteristics of the system were investigated under different regulating strategies. The results show that the variations of amplitude and period of the hydrogen demand have a significant impact on the economy and capacity configuration of the system. The cooperative regulating strategies of hydrogen utilities and grid connection can effectively reduce the total cost of the system.