KraftPowercon’s 5 MW rectifier solution
As hydrogen production projects scale, the demands on power conversion systems increase. For a 5 MW hydrogen plant on Jeju Island, South Korea, KraftPowercon was selected to supply a rectifier system capable of delivering stable, controllable DC power under challenging grid conditions. The solution supports predictable electrolyzer operation while maintaining grid‑friendly performance.
Consistent electrolyzer operation under demanding grid conditions
From the initial commissioning phase, the impact of the 5 MW rectifier solution was clear. The system delivers stable, controllable DC power to the electrolyzer stacks while operating under renewable‑heavy grid conditions, where voltage quality and harmonic performance are critical.
By combining active front‑end technology with a containerized, plug‑and‑play design, the solution supports predictable stack operation, load‑following capability, and low harmonic contribution to the grid. This enables consistent electrolyzer performance while reducing execution and commissioning risk on site.
“For this project, our objective was to secure a cost-effective, safe and reliable rectifier system that meets both our internal requirements and the customer’s expectations, including local codes and standards. Reliable power infrastructure is fundamental — not only for renewable integration, but also to ensure that the electrolyzer system can load-follow and operate consistently under varying conditions.”
Censy Thomas - PSCS IPD Lead and Principal Electrical Engineer, HyAxiom
Industrial hydrogen production
Why power quality matters as hydrogen projects scale
Electrolyzers are DC machines operating in an increasingly dynamic grid environment. As hydrogen projects scale to multi‑megawatt levels and multiple electrolyzer units operate in parallel, the demands on current quality, controllability, and stability increase significantly. In renewable‑heavy grids such as Jeju Island, varying grid conditions place additional emphasis on harmonic performance and load‑following capability. Stable DC power delivery is essential to support predictable stack operation while minimizing the risk of disturbances to surrounding grid infrastructure.
“As a power core provider for hydrogen production plants, KraftPowercon supports the project by enabling stable stack operation while maintaining grid-friendly operating conditions.”
Siyul Kim - Senior Asia Application Manager, High Current
A reference project for scalable hydrogen production
As hydrogen projects in Korea move from pilot installations toward repeatable, industrial‑scale assets, the role of the power conversion system becomes increasingly prominent. Beyond performance, projects must demonstrate predictable operation, regulatory compliance, and manageable execution on site. The Jeju Island project serves as a practical reference for how containerized, grid‑compliant power conversion can support large‑scale electrolysis. It highlights the importance of addressing both electrical performance and project execution early — providing a proven foundation for future hydrogen installations.