Association Multi-Piles à combustible, convertisseurs et système de stockage pour applications embarquées

MEHIDA, Hicham (2023) Association Multi-Piles à combustible, convertisseurs et système de stockage pour applications embarquées. Doctoral thesis, Faculté des Sciences et de la technologie.

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Abstract

With the advancement of technology in recent decades and the application of worldwide norms to minimize greenhouse gas emissions, automakers have turned their attention to new fuel cell electric vehicle technologies. This work focuses on the most important challenges facing today, to improve the performance of fuel cell vehicles and increase their sales globally, which are: reliability, durability, control strategy and energy management, as well as fault detection and correction. In this thesis, a new fault-tolerant control strategy (fuel cell faults and converter faults) based on the concept of flatness is proposed for the energy management of a high reliability hybrid system composed of multi- fuel cells (3 fuel cells) as the main source combined with a pack of supercapacitors as an auxiliary source. In this system, two non-isolated, fault-tolerant DC/DC converter topologies were selected and used in a study we conducted to select the most appropriate electrical structure of multi-fuel cells assembly and the appropriate converter topology from the point of view of inductors size, fuel cell current ripple reduction, reliability and best energy efficiency. To improve the reliability and durability of the proposed system, a universal, inexpensive and fast power switch open circuit fault detection method is developed for DC/DC converters combined with a corrective strategy without adding additional components to these faulty converters. The latter serves to reduce the increase of the fuel cell current ripples and the DC bus voltage ripple, which are observed when investigating these faults in this work. In addition, when a fault is identified at the FC level, a relief strategy is triggered, allowing faulty FCs to be relieved without additional energy loss. In addition, the energy management strategy makes it possible to prioritize the operation of healthy fuel cell and converters.

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