Four independent inputs, containerized design, and grid‑ready 690V AC output. Hygen Power has expanded its fuel cell DC‑DC converter series with a new MW‑class module specifically designed for stationary fuel cell power generation. The unit accepts up to four separate fuel cell stack inputs (each 500kW/1000A) and delivers a stable 800V DC bus, which is then inverted to 3‑phase 690V AC for direct grid connection or island microgrid operation.
Why Stationary Fuel Cells Need Specialized DC/DC Conversion
Fuel cell stacks produce unregulated DC voltage that drops as current increases. Connecting them directly to an inverter causes poor efficiency and potential stack damage. A dedicated DC/DC converter stabilizes the voltage, provides galvanic isolation (or non‑isolated high‑efficiency paths), and allows multiple stacks to share a common DC bus.
Technical Highlights of the New Converter
To address these risks, every DC power supply unit undergoes:
-
Multi‑input flexibility – Four ports, each with independent current control (0‑1000A), accommodate different stack ages or sizes.
-
High efficiency – ≥97.5% from fuel cell DC input to 690V AC output; the DC/DC stage alone exceeds 98%.
-
Containerized standard – Packaged in a 20ft or 40ft container with integrated liquid/fan cooling, operating from -40℃ to +45℃.
-
Modular parallel expansion – Multiple containers can be paralleled to reach tens of MW without master‑slave complexity.
Application Example
A 2MW containerized unit is already being deployed at a European industrial park, converting waste hydrogen from a chlor‑alkali plant into grid electricity. The system automatically starts and stops based on hydrogen availability and grid price signals, achieving an internal rate of return of over 15%.
Availability
The MW‑class fuel cell DC/DC converter is available for order with a lead time of 14‑16 weeks. Custom input voltage ranges (200‑800V) and output voltages (up to 1500V DC) can be accommodated.
