CNRS Research Group in Electrotechnics and Electronics of Nancy

Nancy, France

CNRS Research Group in Electrotechnics and Electronics of Nancy

Nancy, France
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Karimi S.,Institute for Energy and Hydro Technology | Poure P.,University of Lorraine | Saadate S.,CNRS Research Group in Electrotechnics and Electronics of Nancy
IEEE Transactions on Industrial Electronics | Year: 2010

This paper presents a topdown design flow for design, implementation, and verification of digital controllers associated with electrical systems. In the proposed design flow, the functional description of the studied system and the detailed electronic hardware design and validation of the digital controller are performed using a hardware-in-the-loop (HIL)-based reconfigurable platform in a unique design environment. The way of using this design flow and the reconfigurable HIL platform is analyzed through a fault-tolerant shunt active power filter application. The experimental results obtained with a laboratory prototype fault-tolerant active filter demonstrate the performances and the efficiency of the proposed design flow and HIL-based reconfigurable platform. © 2010 IEEE.


Thounthong P.,King Mongkut's University of Technology Bangkok | Tricoli P.,University of Birmingham | Davat B.,CNRS Research Group in Electrotechnics and Electronics of Nancy
International Journal of Electrical Power and Energy Systems | Year: 2014

In this paper, linear proportional-integral (PI) and nonlinear flatness-based controllers for dc link stabilization for fuel cell/supercapacitor hybrid power plants are compared. For high power applications, 4-phase parallel boost converters are implemented with a switching interleaving technique for a fuel cell (FC) converter, and 4-phase parallel bidirectional converters are implemented with a switching interleaving technique for a supercapacitor converter in the laboratory. As controls, mathematical models (reduced-order models) of the FC converter and the supercapacitor converter are given. The prototype small-scale power plant studied is composed of a PEMFC system (the Nexa Ballard FC power generator: 1.2 kW, 46 A) and a supercapacitor module (100 F, 32 V, based on Maxwell Technologies Company). Simulation (by Matlab/Simulink) and experimental results demonstrate that the nonlinear differential flatness-based control provides improved dc bus stabilization relative to a classical linear PI control method. © 2013 Elsevier Ltd. All rights reserved.


Thounthong P.,King Mongkut's University of Technology Bangkok | Luksanasakul A.,King Mongkut's University of Technology Bangkok | Koseeyaporn P.,King Mongkut's University of Technology Bangkok | Davat B.,CNRS Research Group in Electrotechnics and Electronics of Nancy
IEEE Transactions on Sustainable Energy | Year: 2013

A renewable energy hybrid power plant, fed by photovoltaic (PV) and fuel cell (FC) sources with a supercapacitor (SC) storage device and suitable for distributed generation applications, is proposed herein. The PV is used as the primary source; the FC acts as a backup, feeding only the insufficiency power (steady-state) from the PV; and the SC functions as an auxiliary source and a short-term storage system for supplying the deficiency power (transient and steady-state) from the PV and the FC. For high-power applications and optimization in power converters, four-phase parallel converters are implemented for the FC converter, the PV converter, and the SC converter, respectively. A mathematical model (reduced-order model) of the FC, PV, and SC converters is described for the control of the power plant. Using the intelligent fuzzy logic controller based on the flatness property for dc grid voltage regulation, we propose a simple solution to the fast response and stabilization problems in the power system. This is the key innovative contribution of this research paper. The prototype small-scale power plant implemented was composed of a PEMFC system (1.2 kW, 46 A), a PV array (0.8 kW), and an SC module (100 F, 32 V). Experimental results validate the excellent control algorithm during load cycles. © 2010-2012 IEEE.


Thounthong P.,King Mongkut's University of Technology Bangkok | Pierfederici S.,CNRS Research Group in Electrotechnics and Electronics of Nancy | Davat B.,CNRS Research Group in Electrotechnics and Electronics of Nancy
IEEE Transactions on Energy Conversion | Year: 2010

This paper presents an innovative control law for distributed dc generation supplied by a fuel cell (FC) (main source) and supercapacitor (auxiliary source). This kind of system is a multiconverter structure and exhibits nonlinear behavior. The operation of a multiconverter structure can lead to interactions between the controls of the converters if they are designed separately. Typically, interactions between converters are studied using impedance criteria to investigate the stability of cascaded systems. In this paper, a nonlinear control algorithm based on the flatness properties of the system is proposed. Flatness provides a convenient framework for meeting a number of performance specifications for the hybrid power source. Using the flatness property, we propose simple solutions to hybrid energy management and stabilization problems. The design controller parameters are autonomous of the operating point; moreover, interactions between converters are taken into account by the controllers, and high dynamics in disturbance rejection is achieved. To validate the proposed method, a hardware system is realized with analog circuits, and digital estimation is accomplished with a dSPACE controller. Experimental results with small-scale devices (a polymer electrolyte membrane FC of 1200 W, 46 A and a supercapacitor module of 100 F, 500 A, and 32 V) in a laboratory corroborate the excellent control scheme during a motor-drive cycle. © 2006 IEEE.


Didier G.,CNRS Research Group in Electrotechnics and Electronics of Nancy | Leveque J.,CNRS Research Group in Electrotechnics and Electronics of Nancy | Rezzoug A.,CNRS Research Group in Electrotechnics and Electronics of Nancy
IEEE Transactions on Power Systems | Year: 2013

This paper presents a novel approach to determine the optimal location of a resistive superconducting fault current limiter (SFCL) for enhancing the transient stability of an electric power grid (EPG). To select the optimal location of the SFCL, the sensitivity analysis of the angular separation of the rotors of synchronous machines present in the power system is introduced. The optimal location of the SFCL in EPG is coordinated with the corresponding optimal resistive value to improve transient stability and low-frequency oscillation damping performance of the system. It is shown that the SFCL can have different impacts (positive and negative) in function of its location in the EPG when a fault occurs. To evaluate the effectiveness of the proposed method, the IEEE benchmarked four-machine two-area test system is used to carry out several case studies. The results show that the optimal location of SFCL combined with its optimal resistive value reduces the angular separation of the rotors that improves effectively the system stability during a fault. © 2012 IEEE.


Didier G.,CNRS Research Group in Electrotechnics and Electronics of Nancy | Leveque J.,CNRS Research Group in Electrotechnics and Electronics of Nancy
International Journal of Electrical Power and Energy Systems | Year: 2014

This paper presents a novel approach to determine the optimal location of a resistive superconducting fault current limiter (SFCL) to improve the transient stability of an electric power grid (EPG). The presented method use the angular separation of the rotors of synchronous machines present in the power system to select the optimal location of SFCL. The selection of this optimal location is coordinated with the corresponding optimal resistive value to improve transient stability in case of short-circuit fault. To obtain a global study on the optimal placement of SFCL in case of fault, various types of short-circuits are considered (single phase grounded fault, two phases grounded fault, etc.). To evaluate the effectiveness of the proposed method, the IEEE benchmarked four-machine two-area test system is used to carry out several case studies. It is shown that the optimal location of SFCL as well as its optimal resistance value are not the same for each fault studied. A global analysis of EPG stability is presented in the paper to select only one location of the SFCL in the EPG. Results show that the optimal location of SFCL combined with its optimal resistive value reduces the angular separation of the rotors that improves effectively the stability of the EPG for any type of short-circuit.


Magne P.,CNRS Research Group in Electrotechnics and Electronics of Nancy | Nahid-Mobarakeh B.,CNRS Research Group in Electrotechnics and Electronics of Nancy | Pierfederici S.,CNRS Research Group in Electrotechnics and Electronics of Nancy
IEEE Transactions on Power Electronics | Year: 2012

Implantation of complex dc-power network is one of the main research topics in more electric aircraft (MEA). In such applications, small and light systems are required and so optimization of passive elements, such as dc-bus capacitance and filtering inductance, is an important issue. It is known that the reduction of dc-bus capacitance may lead to instability of an MVdc network. So, if no stabilizer is used, the risk of instability must be considered, while designing the system passive elements. In this paper, we will first study the small signal stability of an MVdc network composed of three loads: an inverter supplying a permanent magnet synchronous motor, a dc/dc converter feeding a resistive load, and a supercapacitor controlled by a bidirectional dc/dc converter. Then, we will propose a large-signal-stabilizing system to ensure global stability by generating proper stabilizing power references for the whole system. The contribution of the loads to network stability is adjustable. The validity of the proposed method will be confirmed by experimentations. © 2011 IEEE.


Lubin T.,CNRS Research Group in Electrotechnics and Electronics of Nancy | Rezzoug A.,CNRS Research Group in Electrotechnics and Electronics of Nancy
IEEE Transactions on Industrial Electronics | Year: 2015

This paper presents an approach for quick calculation of steady-state and transient performances of an axial-field eddy-current coupling. Based on a 2-D approximation of the magnetic field distribution, a simple analytical expression for the transmitted torque is first developed. This expression is valid for low slip values, which correspond to the normal working area of such devices (high efficiency). The proposed torque formula is then used to study the steady-state (constant-speed operations) and the transient performances of the coupling (small variations of the slip speed). The results are compared with those obtained from 3-D finite elements simulations and tests. It is shown that good agreements are obtained. © 1982-2012 IEEE.


Lubin T.,CNRS Research Group in Electrotechnics and Electronics of Nancy | Mezani S.,CNRS Research Group in Electrotechnics and Electronics of Nancy | Rezzoug A.,CNRS Research Group in Electrotechnics and Electronics of Nancy
IEEE Transactions on Industrial Electronics | Year: 2014

This paper investigates the steady-state and transient performances of an axial magnetic coupling by using analytical formulas issued from an analytical model based on a 2-D approximation for the magnetic field distribution (mean radius model). From the magnetic field expression, simple analytical formulas are derived for computing the pull-out torque and the torsional stiffness of the coupling as a function of the geometrical parameters. Here, a special attention is given to the overload torque condition during the transient which leads to the loss of synchronism for the coupling. Moreover, radial and angular misalignment conditions are also studied. In order to study the accuracy of the proposed analytical model, the results are compared with those obtained from 3-D finite-element simulations and measurements. © 1982-2012 IEEE.


Lubin T.,CNRS Research Group in Electrotechnics and Electronics of Nancy | Mezani S.,CNRS Research Group in Electrotechnics and Electronics of Nancy | Rezzoug A.,CNRS Research Group in Electrotechnics and Electronics of Nancy
IEEE Transactions on Energy Conversion | Year: 2012

In this paper, a theoretical analysis of an axial magnetic coupling is presented, leading to new closed-form expressions for the magnetic axial force and torque. These expressions are obtained by using a 2-D approximation of the magnetic coupling geometry (mean radius model). The analytical method is based on the solution of Laplaces and Poisson's equations by the separation of variables method. The influence of geometrical parameters such as number of pole pairs and air-gap length is studied. Magnetic field distribution, axial force, and torque computed with the proposed 2-D analytical model are compared with those obtained from 3-D finite elements simulations and experimental results. © 2012 IEEE.

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