Design of High-Power Converter for Hydrogen Production

Low voltage, high current, low ripple, and high efficiency of 1200 Nm3/h are the requirements of electrolyzer, a high-power DC/DC converter based on 6 groups of IGBT modules in parallel and 8 branches interleaved output is designed, with a maximum output power of 5.74 mw (700V × 8200 A), efficiency more than 98%. The conduction time interval of 8 branches is T/8 in turn. The inductance current of each branch is superimposed with each other to make the output current ripple less than 1%. In addition, according to the multi-mode operation requirements of electrolyzer, a controller based on DSP + FPGA is designed including voltage/power droop control and output voltage stabilizing control. The porotype test results show that the design is effective and feasible, finally is applied for the 2022 Beijing Winter Olympic Games.