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Lille, France
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Hajian M.,University of Aberdeen | Marin D.,L2EP | Ferrer-San-Jose R.,Polytechnic University of Catalonia | Nguefeu S.,French Electricity Transmission Network
IET Conference Publications | Year: 2017

The inductor-capacitor-inductor (LCL) fault tolerant DC/DC converters have shown promising properties in DC voltage stepping using no internal AC transformer. This paper details design and modelling a 5kW, 250V/400V LCL IGBT based DC transformer. The design is to be prototyped at CITCEAUPC in Barcelona and put into a five terminal mock up DC grid located at Electrical Engineering and Power Electronics Laboratory (L2EP) in Lille. Different topologies of DC transformer integration into the mock up are studied and best scenario is identified considering optimised power flow within the grid and DC voltage profile at different bus bars. The embedded converter divides the DC grid into two separate protection zones which results in easier grid protection design. An advanced control method developed in one single synchronous frame linked with central capacitor voltage is also proposed. The whole system including 5 VSC terminals and designed DC transformer is modelled in EMTPRV and the converter performance in DC power flow regulation, DC fault isolation, and DC voltage stepping is demonstrated using simulation results.


Vidrih Z.,University of Swansea | Vezzoli E.,L2EP
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

Electrovibration technique can modify user’s perception of a surface through the modulation of the sliding friction accordingly to the voltage applied. This paper is introducing a novel approach to virtual haptic rendering in electrovibration based haptic displays in order to provide realistic feeling of a simulated surface, where the required voltage signal is obtained using a simplified equation. The approach was validated by the use of a finite element computational framework able to simulate tactile scenarios on real and virtual surfaces. A database of precompiled tactile scenarios was generated to predict outputs for custom parametric surfaces through a conditional average estimator method. In addition, an experimental database obtained by active exploration of different surfaces, is utilised for texture rendering. A web application, comprising the algorithms described in the paper, has also been developed, and is freely available to use at http://www.haptictexture.com. © Springer International Publishing Switzerland 2016.


Depature C.,L2EP | Boulon L.,University of Quebec at Trois - Rivieres | Boulon L.,Hydrogen Research Institute | Sicard P.,University of Quebec at Trois - Rivieres | Fournier M.,Hydro - Quebec
2013 15th European Conference on Power Electronics and Applications, EPE 2013 | Year: 2013

The paper presents a control design oriented simulation model of a multi-stack Fuel Cell System (FCS). The aim of such a system is to improve performance, reliability and system integration versus a common single stack FCS. This paper is based on Energetic Macroscopic Representation principles and on preliminary works on FCS modeling and simulation. This paper shows the development of a complete multi-stack system simulation model from elementary parts. The used stack model is experimentally validated and simulation results of the multi-stack system are provided. © 2013 IEEE.


Rault P.,École Centrale Lille | Colas F.,L2EP | Guillaud X.,École Centrale Lille | Nguefeu S.,French Electricity Transmission Network
IEEE Power and Energy Society General Meeting | Year: 2012

This paper deals with small signal stability analysis of Voltage Source Converter based Multitermial HVDC grids (VSC-MTDC). First, a simplified model is used to predict the voltage dynamic behavior. Next, a modular method to build the state space model of the overall MTDC system is described. Model validation is achieved in time domain by a comparison with an electromagnetic simulation in EMTP-rv. As concrete example of effective application, a parametric study on the droop value is carried on a 3-terminal meshed HVDC grid. This example attests to the effect of the droop parameter on the stability of the overall system. © 2012 IEEE.


Aslan B.,L2EP | Semail E.,Arts et Metiers ParisTech
Proceedings - 2014 International Conference on Electrical Machines, ICEM 2014 | Year: 2014

For a power range from 10 to 30 kW, 5-phase machines are well adapted to low-voltage (48V) supply thanks to their reduced current per phase. For three-phase machines but with higher voltages (>120V), machines with a number of slots per pole and per phase spp equal to 0.5 (as the 12slots/8poles combination) are widely used in hybrid automotive applications when a wide speed range is required. The reason is that the value of spp=0.5 guarantees no sub-harmonics and thus induces low level of permanent magnet rotor losses. In this paper a 20slots/8poles/5phases machine is chosen. With a winding factor of only 0.588 for the first harmonic, this machine is only interesting if its high third harmonic winding factor (0.951) is used. Thus, a new bi-harmonic rotor structure is presented. Thanks to adequate control with flux-weakening and ratio r between first and third harmonic currents, the maximum torque versus speed characteristic is determined. © 2014 IEEE.


Giraud F.,L2EP | Amberg M.,L2EP | Lemaire-Semail B.,L2EP
2013 World Haptics Conference, WHC 2013 | Year: 2013

Electrovibration and squeeze film effect can modify the perception a user has of a flat surface. These two stimulation principles are compatible, which means that they can be used at the same time on the same tactile stimulator. This paper first highlights the differences between the two principles, then gives experimental results obtained when merging, with specific conditions, these two stimulation principles. © 2013 IEEE.


Henneron T.,L2EP | Clenet S.,Arts et Metiers ParisTech
IEEE Transactions on Magnetics | Year: 2014

In the domain of numerical computation, model order reduction approaches are more and more frequently applied in mechanics and have shown their efficiency in terms of reduction of computation time and memory storage requirements. One of these approaches, the proper orthogonal decomposition (POD), can be very efficient in solving linear problems but encounters limitations in the non-linear (NL) case. In this paper, the discrete empirical interpolation method coupled with the POD method is presented. This is an interesting alternative to reduce large-scale systems deriving from the discretization of NL magnetostatic problems coupled with an external electrical circuit. © 2014 IEEE.


Da Luz M.V.F.,Federal University of Santa Catarina | Leite J.V.,Federal University of Paraná | Benabou A.,L2EP | Sadowski N.,Federal University of Santa Catarina
IEEE Transactions on Magnetics | Year: 2010

This paper presents a 2-D finite-element model to analyze the iron losses in a three-phase transformer. In this model, the effects of nonlinear core behavior are taken into account by means of a vector hysteresis model incorporated in the finite-element formulation by using a magnetic differential reluctivity tensor. The reluctivity tensor emerges naturally from the vectorized JilesAtherton model. The complete model includes eddy current losses and the anomalous losses. The magnetization currents are calculated and compared with the measured ones. Calculations of hysteresis loops at spotted points of the transformer are also performed. The comparisons between the iron losses measured and calculated with vectorial hysteresis, including the eddy current and the anomalous losses, are presented. © 2006 IEEE.


Leite J.V.,Federal University of Paraná | Benabou A.,L2EP | Sadowski N.,GRUCAD EEL UFSC
IEEE Transactions on Magnetics | Year: 2010

Inrush currents have undesired effects on transformers when these ones are, for example, switched into service. Theses effects have to be taken into account when designing a transformer, what leads to a constraint on its magnetic core and size definition. This paper investigates the modeling of inrush currents in a three phase transformer under sinusoidal voltage operation conditions. The transformer core is modeled taking into account the magnetic hysteresis including the anisotropy. Therefore, a Jiles-Atherton vectorized model is used for the nonlinear core modeling. The key advantage of this vector model is its reluctivity tensor which is appropriated for the Finite Element calculations in vector potential formulation. A time-domain simulation was carried out and the results were compared with experimental data for the procedure validation. © 2006 IEEE.


Allegre A.-L.,L2EP | Bouscayrol A.,L2EP
IET Electrical Systems in Transportation | Year: 2013

A hybrid energy storage system (HESS) composed of electrochemical batteries and supercapacitors is considered. The supercapacitors aim to manage the peak power and thus increase the lifetime of the battery. A control scheme of this HESS is obtained by inversion of its energetic macroscopic representation. This control scheme enables different energy management strategies using a distribution input to share the energy between both devices. A switching strategy and a frequency strategy have been tested using this same control scheme. This flexible control scheme has been validated in real time by using a real HESS and a hardware-in-the-loop simulation of the traction system of an electric vehicle. © The Institution of Engineering and Technology 2013..

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