Résumé

A safety control strategy for the TransformerLess Partial Voltage Converter (TLPVC) applied to green hydrogen production via water electrolysis is proposed. Given the narrow operational voltage range of electrolyzers, the TLPVC presents a suitable solution by processing only a fraction of the input voltage while effectively covering the full voltage range required by the electrolyzers. In addition, the TLPVC improves the Semiconductor Capacity Utilization Index (SCUI) by reducing the stress on the switching cells, enabling more efficient power handling compared to conventional buck DC-DC converters. Its structure enables current balancing between electrolyzers using a single duty cycle. However, due to electrolyzer aging, parameter variations may arise overtime, potentially causing imbalances in the input capacitor voltages—especially at higher duty cycles. To address this, a nonlinear safety-oriented control strategy is proposed, regulating the current of the most degraded electrolyzer while maintaining balanced input capacitor voltages. Simulation results obtained using PLECS confirm the effectiveness of the proposed approach.