High-Efficiency, High-Power Asymmetrically Designed Three-Phase Power Supply for Electrolytic Hydrogen Production

This article presents a parallel 24-pulse rectifier employing dual non-phase-shifted transformers (DNPST) to efficiently address the cost-effectiveness and high-power requirements in the electrolytic hydrogen production, with the characteristics of low-voltage and high-current demands. The proposed method injects voltage harmonics, generated by harmonic injection circuits, into the dc side of the rectifier through two specially designed asymmetric DNPST. It brings an almost sinusoidal input current and an output current with 2.5% ripple rate of the rectifier, significantly improving the power quality. Furthermore, the two small-capacity injection circuits are capable of performing phase shifting, thus eliminating the need for phase-shifting transformers. Finally, both simulated and experimental results are given to validate the effectiveness of the proposed system.