Open-Circuit Switch Fault Diagnosis and Accommodation of a Three-Level Interleaved Buck Converter for Electrolyzer Applications

This article proposes a novel open-circuit switch fault diagnosis method (FDM) for three-level interleaved buck converter (TLIBC) in hydrogen production system based on the water electrolysis process. The control algorithm is suitably modified to ensure same despite fault. TLIBC enables interfacing of power source (i.e., low-carbon energy sources) and electrolyzer while driving terms current or voltage. On one hand, can guarantee continuity operation case failures because its architecture. other appearance failure may lead loss performance. Therefore, it crucial accurately locate implement fault-tolerant strategy performance purposes. proposed FDM relies comparison shape input pulse width modulation (PWM) gate signal each switch. Finally, an experimental test bench designed realized evaluate developed during post-fault operation. It implemented with real-time MicroLabBox dSPACE (dSPACE, Paderborn, Germany) platform combined TI C2000 microcontroller. obtained simulation results demonstrate that detect switching period reconfigure law accordingly delivered before failure.