Analysis of the Different Schemas of Regenerative Power-Hydrogen System

Abstract

In the process of rapid development of renewable energy, the hydrogen system will have a strong coupling relationship with the power system through the electrolysis of water and other links. To study the coupling modes of these two systems and the role of different links in the system is of great significance for the future planning and development of the power-hydrogen system. The research applied the regional power-hydrogen system collaborative optimization planning model to a net energy-importing province and obtained the capacity configuration and operation mode optimization results of five regenerative power-hydrogen system schemas. The impacts of hydrogen import, electrolysis of water, and power generation using hydrogen in the system were analyzed by comparing the optimization results of the five system schemas. The research results show that the above three links are all necessary to achieve the lowest total system cost. Among them, appropriate hydrogen import can avoid the rapid increase of hydrogen storage costs after hydrogen production from water electrolysis exceeds a certain amount. The appropriate amount of hydrogen from water electrolysis by utilizing surplus renewable electricity can replace part of hydrogen import at a lower marginal cost. Proper power generation using hydrogen can reduce the cost of power sources and energy storage.