Guillaume Fontes

Interactions Between Fuel Cells and Power Converters: Influence of Current Harmonics on a Fuel Cell Stack

As fuel cells are likely to be used in many future applications, dedicated power converters must be developed and optimized. A thorough knowledge of the fuel cell operation is thus required for power electronics engineers. This paper proposes a theoretical and experimental study of the behavior of a fuel cell stack subject to current harmonics. The fundamental role of the internal double layer capacitor is demonstrated

A Large-Signal and Dynamic Circuit Model of a

The authors propose a large-signal and dynamic circuit model for a proton exchange membrane fuel cell, which includes the following different main physical and chemical phenomena: activation, electrochemical double layer, gas diffusion through the gas diffusion and active layers, and ohmic losses. Be careful: this is not an impedance model. This model will be used in studying the interactions between fuel cells and power converters which are connected and, particularly, the fuel-cell behavior facing the perturbations created by the buck converter and the single-phase inverter.

\hbox{H}_{2}/\hbox{O}_{2}

This paper deals with a hybrid electrical network for an aircraft in emergency operation. The principle of this network is to hybridize, through a bidirectional DC/DC converter, a high speed Ram Air Turbine (RAT) with an electrochemical Lithium Ion accumulator. A design study of DC/DC power converters, according to the voltage of the accumulator, is presented. The results of this study have shown that utilization of a medium-voltage battery can be a good mass / efficiency trade off of the overall system. Some experiments on a lab test bench have allowed validating the principle of the hybridization and several energy management strategies have been tested with low and medium voltage lithium ion batteries.

PEM Fuel Cell: Description, Parameter Identification, and Exploitation

The purpose of this paper is to present and describe a hybrid electrical network for an aircraft in emergency operation. The principle of this network is to hybridize, through a bidirectional DC/DC converter, a high speed turbine (Ram Air turbine - RAT) with an electrochemical storage. Some experiments on a lab test bench have allowed validating the principle of the hybridization and several energy management strategies have been tested with a low voltage lithium ion battery. A design study of DC/DC power converters, according to the voltage of that storage device, has been done. This study tries to be as exhaustive as possible in view of determining the best voltage connection in terms of mass and efficiency. This study has led to the design and sizing of a medium-voltage battery from which future tests will be carried out on the lab test bench.