Introduction  As wind-solar hydrogen production projects expand in scale and number, there is a growing demand for the design, equipment selection, and economic comparison of green hydrogen production systems. This paper, based on the design experience of multiple similar projects, extracts the typical design of wind-solar coupled hydrogen production system and provides the design selection.

  Method  This paper introduced design scheme of wind-solar coupled hydrogen production from the aspects of wind-solar hydrogen storage capacity configuration scheme, electrolysis hydrogen production equipment performance and rectifier comparison, hydrogen and oxygen separation and purification system design, and green hydrogen market and economy analysis.

  Result  Capacity configuration can be optimized according to the developed design software through constraint conditions. alkaline electrolysis equipment is the preferred choice for hydrogen production, while proton exchange membrane (PEM) electrolysis equipment can be used for small-scale engineering demonstration. Both thyristor and insulated gate bipolar transistor (IGBT) power rectifiers have their own advantages, and IGBT rectification is gradually being applied in engineering practice. For saving investment, separation and purification can be optimized according to the scale of the project. The market for green hydrogen is huge. As fossil fuel prices continue to rise and the costs of wind-solar coupled hydrogen production systems decrease, coupled with its eco-friendly characteristics, green hydrogen has already become economically competitive.

  Conclusion  The wind-solar coupled hydrogen production project is still in the initial demonstration stage, which requires equipment technology progress, design scheme optimization and government policy support to promote the development of green hydrogen industry.