Selecting an Installation Site for MW-Scale Water Electrolysis Systems Based on Grid Voltage Stability

Abstract

Worldwide, efforts are underway to produce hydrogen from water electrolysis, moving beyond the traditional reforming of fossil fuels. Renewable energy-powered hydrogen production is possible, but the use of grid power is also being considered for large-scale production. Additionally, some demonstration projects aim to utilize electrolysis systems as auxiliary service resources to enhance stability in the grid, given the rising share of renewable energy. This study proposes a method for connecting electrolysis facilities to the grid based on voltage stability analysis. The method involves analyzing the grid power parameters required by the electrolyzer and fault scenarios where low voltage could cause system shutdowns, as observed in actual case studies. By conducting voltage stability analysis simulations that incorporate these fault scenarios, the method identifies locations where the electrolyzer can operate stably within power grids. This approach aims to ensure the stable operation of electrolysis facilities even under conditions of renewable energy loss and low-voltage occurrences in the distribution system due to potential transmission system failures.

Keywords

• green hydrogen
• water electrolyzer
• grid connection
• grid auxiliary service
• voltage stability