To coordinate and match fluctuations of hydrogen demand in chemical production systems with the intermittent and variability of renewable energy

an optimization model for the electricity-hydrogen energy storage system coupled with a renewable energy system and a hydrogenation system in the chemical production systems was established

aiming to minimize the total cost of the energy storage system and to determine the optimal capacity configuration and power dispatching scheme of the system. The design and operation characteristics of the energy storage system were analyzed and discussed under the different configuration of the system and the penetration rate of renewable energy. The results show that when the hydrogen demand of the chemical production system is completely satisfied by the renewable energy

the energy storage combined by battery system and hydrogen tanks can effectively reduce the total cost of the system. In the electricity-hydrogen storage system

the configuration of the battery can effectively reduce the maximum load of the electrolyzer. The battery is used to stabilize fluctuations in the supply and demand in a short term

whereas the hydrogen tank is used to cope with mismatches between the supply and demand in a long-term. The total cost of the system increases dramatically with the increase of the penetration rate of renewable energy. To maintain the stability of the purchased hydrogen flow rate

the capacity of the electrolytic cell and the energy storage system needs to be increased in the system to solve the fluctuation and mismatch between the power generation side and the load side.