Gif-sur-Yvette, France
Gif-sur-Yvette, France
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Carrere T.,French National Solar Energy Institute | Carrere T.,French Environment and Energy Management Agency | Varache R.,French National Solar Energy Institute | Munoz D.,French National Solar Energy Institute | Kleider J.P.,LGEP
Journal of Renewable and Sustainable Energy | Year: 2015

An emerging cell concept based on silicon heterojunctions called hetero-homojunction is investigated by means of numerical simulations. Compared to the usual amorphous/crystalline silicon (a-Si:H/c-Si) heterojunction architecture, the hetero-homojunction cell contains an additional thin and highly doped (p+)- or (n+)- c-Si layer at the front or back (i)a-Si:H/(n)c-Si interface, respectively. In this paper, we show the dependence of solar cell performance on the additional heavily doped c-Si layer parameters (thickness and doping) and a-Si:H/c-Si interface properties. Insertion of the (p+)c-Si improves the cell power conversion efficiency by almost 1% absolute and lowers its sensitivity to a-Si:H/c-Si interface defects. Improved field effect passivation leading to higher open circuit voltage and fill factor is evidenced and the added layer is optimized with regard to hetero-homojunction cell efficiency. The (n+)c-Si layer addition also decreases the recombination rate at the back hetero-interface but does not improve significantly the conversion efficiency. The latter result is finally discussed. © 2015 AIP Publishing LLC.

Ledoux C.,Supelec | Lefranc P.,Supelec | Thomas J.-L.,Supelec | Larouci C.,Control Systems Laboratory | And 2 more authors.
IECON Proceedings (Industrial Electronics Conference) | Year: 2010

So as to reduce size, volume, weight and increase efficiency of power supplies for electrical sequential loads, authors propose to analyze functioning and disfunctioning of two converter topologies: inverter + power sharing system ; matrix converter. A system with two electrical machines is analyzed through simulations from the control point of view and the design point of view considering over-current conditions constraints. Theses preliminary results enhance the possibility to use matrix converters. © 2010 IEEE.

Meynard T.,CNRS LAPLACE Lab | Cougo B.,CNRS LAPLACE Lab | Forest F.,Montpellier University | Laboure E.,LGEP
Proceedings of the IEEE International Conference on Industrial Technology | Year: 2010

Duality rules show that the multilevel output voltage of series multicell converters transposes in the form of a multilevel input current in parallel converters. However the duality of these families of converter is only partial and parallel converters offer an extra advantage which is multilevel output behavior. When the inductors are coupled together, it is even possible to reduce the ripple of internal quantities, i.e. individual cell currents. The magnetic components at the heart of these converters obey very particular rules and need a specific design procedure. The leakage inductance of this component plays an important part in this design and because it involves flux trajectories in the air it is difficult to predict its value and optimize the design. It is also required to evaluate the core losses, the copper losses and the heat exchange surface to determine which number of cells should be used to minimize total weight. Such a procedure is described and used to compare designs with coupled and uncoupled inductors. ©2010 IEEE.

Kolli A.,IFSTTAR LTN | Nafziger T.,IFSTTAR LTN | De Bernardinis A.,IFSTTAR LTN | Bethoux O.,LGEP | And 2 more authors.
2013 15th European Conference on Power Electronics and Applications, EPE 2013 | Year: 2013

This paper deals with a 3-phase H-bridge inverter feeding a Permanent Magnet Synchronous Machine drive. An innovative Space Vector PWM strategy gathers electric vehicle (EV) specifications and objectives like high reachable base speed, minimization of zero-sequence current ripple and switching losses. In this paper, authors present experimental results performed on inductive inverter prototype. © 2013 IEEE.

Bernard L.,LGEP | Torrado R.R.,LGEP | Pichon L.,LGEP
IEEE Transactions on Magnetics | Year: 2010

In this paper, we show how to use hexahedral and prismatic elements for the efficient development of uniaxial anisotropic dispersive media (UPML) around an initial unstructured tetrahedral primal mesh using the generalized finite-difference (GFD) method. The initial mesh is assumed to have plane external boundaries. Taking into account the properties of the UPML medium, we build a special discrete Hodge in order to have a simple scheme for the time-domain solution of Maxwell's equations. The method is presented for the general 3-D case and numerical results show its efficiency. © 2006 IEEE.

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