Parallel Power Converter Phase Control for Electrolyzer Ripple Reduction

The patent applies asymmetry by deliberately creating an asymmetric phase relationship between the clock frequencies of multiple power converters. Instead of operating all converters at the same frequency (symmetric operation), the control apparatus assigns different phase shifts to each converter's clock frequency, causing their commutation events to occur at different times. This asymmetric timing distribution reduces the superposition of voltage and current ripples while maintaining relatively simple control logic.

The patent applies periodic action by utilizing the periodic nature of clock frequencies with different phase shifts. Each power converter operates periodically at its assigned clock frequency, and the phase differences cause the commutation events to be distributed periodically over time. This periodic distribution reduces the concentration of switching losses and electromagnetic interference at any single moment, while still maintaining high-frequency operation for efficient power conversion.

The patent applies parameter changes by modifying the phase shift parameter of each power converter's clock frequency. The control apparatus adjusts these phase shift parameters to optimize the distribution of commutation events. By changing only the phase parameter (rather than the fundamental frequency), the system achieves ripple reduction while maintaining relatively simple control logic and preserving the high-frequency operation benefits.