Reliability improvement of multi-phase interleaved DC-DC converters for fuel cell electric vehicle applications

Abstract

This paper suggests a fast and low-cost method that can be applied in several DC/DC converter topologies for detecting open circuit faults (OCFs) and short circuit faults (SCFs). The suggested method may identify the faults of several power switches even if they occur simultaneously in multi-phase interleaved boost converters (MPh-IBC) by using just the sensors needed to control the converter. This fault detection method (FDM) is based mainly on comparing the measured inductor current and two fault detection thresholds, one for OCFs detection and the other for SCFs detection. This method combined with a corrective strategy to mitigate the negative impacts of OCFs, particularly the significant rise in the ripple of the DC bus voltage and the fuel cell (FC) current, which reduces FC aging and converter reliability. The simulation findings indicate the FDM's excellent performance and speed, as well as its usefulness in detecting defects of many power switches in the converter, with a fault detection time of up to 1.7 µs. The acquired findings further show the excellent effectiveness of the corrective strategy in reducing these ripples in the event of one or two faults.

Enhancing voltage stability through wavelet-fuzzy control of hydrogen flow in OC-PEM fuel cell

“…The ohmic voltage drop (Vohmic) is associated with the internal electronic resistance within the system and is computed using as (5):…”

“…This electrochemical reaction results in electricity production, with the sole byproducts being water and heat, establishing OC-PEM fuel cells as environmentally friendly [3]. OC-PEM fuel cells are versatile, suitable for both fixed and variable loads [4], [5]. In fixed load scenarios, they can efficiently power residential homes or offices, where stable operation is essential to meet consistent power demand [6].…”