[en] The electric double layer phenomenon is sometimes described by means of a specific element called 'constant phase element', instead of the usual electric double layer capacitance. This article deals with such an element, often associated with rough surfaces. It is first shown, using a lithium-ion battery and a PEM fuel cell, that this element can obviously improve accuracy in the modelling of electrochemical device harmonic spectrum. The article then focuses on an approximation method, which enables easy use of constant phase element in time domain. This method, which comes from fractional differentiation theory, is based on some properties of recursive transfer functions. The approximation procedure is explained, and comparisons between exact and approximated results are carried out.

[en] The management of embedded electrical energy needs a storage system with high dynamic performances in order to shave transient power peaks and to compensate for the intrinsic limitations of the main source. The use of supercapacitors for this storage system is quite suitable because of appropriate electrical characteristics (huge capacitance, weak series resistance, high specific energy, high specific power), direct storage (energy ready for use) and easy control by power electronic conversion. This paper deals with the conception and realisation of a voltage regulated hybrid DC power source using supercapacitors as an auxiliary storage device. Here, we present the structure, control principle and results associated with experimental validation. Our interest will be focused on the management of transient power peaks

[en] Supercapacitors are new storage elements for electrical energy. They have an instantaneous power more significant than that of the batteries and an energy larger than that of the conventional capacitors. Their lifespan are higher than that of the batteries (approximately 10 years). They have a structure anode-cathode containing activated carbon, which leads to obtain very high capacitance values (up to 5000 F). So supercapacitors will be new potential storage elements for energy, ideally complementary to the batteries or the fuel cell in the field of transport for example. Other applications as in the field of stationary or telecommunication were carried out in the world, or are in phase of study and of evaluation. Many studies are carried out to increase the cross capacity-voltage of these components. However due to their recent technology, some significant points remain in order to know how to improve the reliability of the component and the system in which they are used. The objective of this congress is to bring together in Europe the specialists who work in the field of the supercapacitors, to present the state of the art and to discuss the evolution of the technologies for supercapacitors, as well as theirs use in various fields. This congress will have to specify the problems concerning reliability, the diagnosis and the safety of their use as well as the development of devices for balancing and power electronics related to the use of the supercapacitors. Content: 1 - Ultracapacitors: today's achievements and tomorrow's perspectives; 2 - Energy Storage on board of railway vehicles; 3 - Nanostructured transition metal oxides for aqueous hybrid electrochemical supercapacitors; 4 - Development and fabrication of a 1.5F-5V Solid electrolyte supercapacitor; 5 - Study of surface treatment of Al current collector foil and influence of carbon nanotubes in Carbon/Carbon supercapacitors in organic electrolyte; 6 - Calculation of diffusion coefficients of TEABF4 in acetonitrile by means of the single particle microelectrode technique; 7 - Fe₂O₃ polypyrrole hybrid nanocomposite supercapacitors; 8 - Manganese oxide nanocomposites as supercapacitor electrode materials: Preparation and electrochemical performances; 9 - Fabrication of Birnessite-type Layered Manganese Oxide Films for Supercapacitors; 10 - Electro-thermal analysis of hybrid electrochemical Supercapacitors; 11 - Development and characterization of Ni-C supercapacitor; 12 - Electrical and thermal behaviour of a supercapacitor module: on-line characterization; 13 - Ultracapacitor electrical modeling using temperature dependent parameters; 14 - Modeling of the supercapacitors and influence of the temperature during a self-discharge; 15 - Supercapacitor modeling with Artificial Neural Network (ANN); 16 - First accelerated ageing cycling test on supercapacitors for transportation applications: methodology, first results; 17 - Impedance measurement and modeling of supercapacitors for railway applications; 18 - Capacitance and series resistance determination in high power ultracapacitors; 19 - Contribution to dimensioning a pack of supercapacitors for 12/42 V application; 20 - Using supercapacitors in combination with bi-directional DC/DC converters for active load management in residential fuel cell applications; 21 - The use of a combined battery/supercapacitor storage to provide voltage ride-through capability and transient stabilizing properties by wind turbines; 22 - Power-energy management in lift drive system with super capacitors compensator; 23 - A solution for increasing the efficiency of Diesel-electric locomotives with supercapacitive energy storage; 24 - System variants for operation of trams without a catenary; 25 - Supercapacitors as an energy storage for fuel cell automotive hybrid electrical system; 26 - Supercapacitors for embarked systems as a storage energy device solution; 27 - Small Hybrid Bus TOHYCO-Rider with Supercaps and inductive power transfer; 28 - Fostering the commercialization of Ultracapacitors