Green hydrogen energy storage is an important way to solve the problem of intermittent and unstable renewable energy sources. Renewable energy sources such as solar and wind power are affected by natural conditions and have the problem of intermittent power generation. By converting the electricity generated by renewable energy into green hydrogen through electrolysis, hydrogen can be used as an energy storage medium. When the power generation of renewable energy is surplus, the electricity is used to produce hydrogen; when the power generation is insufficient or the energy demand is high, the hydrogen is released and converted back into electricity through fuel cells or other devices, or used for heating and other purposes. This realizes the "power - hydrogen - power" conversion, which can effectively store and release energy, improve the utilization efficiency of renewable energy, and provide a stable energy supply for the power system.