Power quality enhancement of rectifiers of water electrolysis for the green hydrogen

Electrolysis, a clean and efficient method, utilizes renewable alternating current (AC) for water decomposition into hydrogen. This study addresses power quality improvement in rectifiers converting renewable AC to direct current (DC) for electrolysis. This study focuses on improving the power quality of rectifiers used to convert AC from renewable energy sources into a DC source for hydrogen production in water electrolysis systems. For this purpose, the 12-pulse topology, using two interconnected 6-pulse rectifiers, delivers a smoother DC output with reduced ripple and improved mains current quality. This significantly minimizes harmonics, achieving a waveform closer to a pure sine wave without additional filtering. This approach offers a promising solution to mitigate power quality issues in renewable hydrogen production systems.