C. Cabal

University of Toulouse, Tolosa de Llenguadoc, Midi-Pyrénées, France

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Publications (14)7.35 Total impact

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    ABSTRACT: A perturb and observe algorithm based on both the power-current characteristic of a photovoltaic (PV) panel and the sliding-mode control of the input inductor current of an associated converter is investigated in a static application. A single ended primary inductance converter (SEPIC) converter charging a battery from a PV generator illustrates the procedure whose effectiveness is proved with experimental results. The reported technique is appropriate for distributed maximum power point tracking of PV systems with output series connected DC-DC switching converters. In these systems, each converter is supplied by an independent PV panel at the input port whereas its output port is connected in series with the output ports of the other converters. The proposed converter interconnection is based on a transformer-less SEPIC because of the capability of this converter to step-up or step-down the input voltage. The resulting system allows maximum power extraction from each PV source even in cases of non-uniform irradiance.
    IET Power Electronics 04/2014; 7(4):914-923. · 1.52 Impact Factor
  • International Journal of Photoenergy 01/2012; · 2.66 Impact Factor
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    ABSTRACT: The paper analyses extremum-seeking control technique for maximum power point tracking circuits in PV systems. Specifically, the paper describes and analyses the sinusoidal extremum-seeking control considering stability issues by means a Lyapunov function. Based on this technique, a new architecture of MPPT for PV generation is proposed. In order to assess the proposed solution, the paper provides some experimental measurements in a 100 W prototype which corroborate the effectiveness of the approach.
    International Journal of Photoenergy 01/2012; 2012. · 2.66 Impact Factor
  • International Exhibition & Conference for Power Electronics Intelligent Motion Power Quality (PCIM Europe 2011); 05/2011
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    International Conference on Renewable Energies and Power Quality (ICREPQ'11); 04/2011
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    ABSTRACT: The article studies the dynamic performance of a family of maximum power point tracking circuits used for photovoltaic generation. It revisits the sinusoidal extremum seeking control (ESC) technique which can be considered as a particular subgroup of the Perturb and Observe algorithms. The sinusoidal ESC technique consists of adding a small sinusoidal disturbance to the input and processing the perturbed output to drive the operating point at its maximum. The output processing involves a synchronous multiplication and a filtering stage. The filter instance determines the dynamic performance of the MPPT based on sinusoidal ESC principle. The approach uses the well-known root-locus method to give insight about damping degree and settlement time of maximum-seeking waveforms. This article shows the transient waveforms in three different filter instances to illustrate the approach. Finally, an experimental prototype corroborates the dynamic analysis.
    International Journal of Electronics 04/2011; 98(4):529-542. · 0.51 Impact Factor
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    ABSTRACT: The analyses of the performance of a complete photovoltaic system require precise measuring equipment in order to obtain reliable comparative results. This paper presents a computer-based instrumentation system suitable for a characterization of photovoltaic conversion chains. Consisting in a data acquisition stage, a data processor, photovoltaic generators and power conditioners, the system evaluates the respective efficiency of maximum power point tracker (MPPT) and power conditioner. The efficiency of unknown MPPT functions is estimated with great accuracy by means of an extremum control-based MPPT used as a reference. Efficiency evaluations of two photovoltaic battery chargers during 4 days illustrate the estimation procedure and the system test facilities.
    International Journal of Metrology and Quality Engineering. 12/2009; 1(02):129 - 137.
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    ABSTRACT: European efficiency definition demonstrates that photovoltaic generators operate in average between 30% and 100% of its rated power 80% of its working time. Nowadays, converters are designed with a maximal efficiency working point, but often, this point does not fit with the correct power range. This paper presents a structure with a parallel connection of n converters to obtain higher conversion efficiency for the power range between 30% and 100% of the rated power. The European efficiency has been improved and higher energy production has been achieved with this new structure.
    01/2009;
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    ABSTRACT: This paper presents a new design of dc-dc converter with MPPT (Maximum Power Point Tracking) for applications using pm-SiH/muc-Si:H solar cells. The aim of our new design architecture is not to manage a global photovoltaic panel but manage many independent groups of photovoltaic cells. The distributed architecture will allow an optimization of the power management of each channel characteristic dependant of the ageing cells, soiling and weather effects.
    Industrial Electronics, 2008. ISIE 2008. IEEE International Symposium on; 08/2008
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    ABSTRACT: In this paper, the parallel connection of two power semigyrators of type G with controlled input current is used as an adaptation stage to improve the efficiency and reliability of a photovoltaic power conversion chain. A current sharing control has been incorporated in the system for guarantee the uniform distribution of the total peak power among the dc-dc converters. We use a democratic current sharing policy that also performs the impedance matching of the PV array. Simulation and experimental results show that the proposed system is suitable to perform the parallel connection of two power converters with gyrators characteristics preserving the Maximum Power Point Tracking of the PV array.
    Industrial Electronics, 2008. ISIE 2008. IEEE International Symposium on; 08/2008
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    ABSTRACT: This paper presents a parallel connection of three-cell interleaved boost converters used as an adaptation stage dedicated to photovoltaic applications. Indeed, this structure associated to a MPPT control improves the efficiency and reliability of a photovoltaic power conversion chain. An additional current sharing control has been incorporated to assure a uniform distribution of power between each DC-DC converter. Every voltage and current ripples present on the load and photovoltaic (PV) source implying the switch stresses are reduced with this technique compared to a classical structure. Finally; experimental results show that the proposed technique can be used for impedance matching of a PV array.
    Power Electronics Specialists Conference, 2008. PESC 2008. IEEE; 07/2008
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    ABSTRACT: A large part of photovoltaic research is dedicated to developing innovative integration technology for the module. Now the use of a storage function in such intermittent power supply systems is crucial in order to get better adequacy between the peaks of energetic consumption and production. The integration degree of photovoltaic systems will be improved if all the components: panel, battery, converters, electronic control unit, cablings can be combined in a compact single unit. Different battery technologies are currently used with photovoltaic systems along with some of the charging and discharging techniques that are available. Lithium-ion technology appears to be the best candidate because of its high energetic efficiency, high specific energy density, deep discharge ability, its long cycling life and its possible different shapes (cylindrical or prismatic styles) to obtain an integrated design. To optimize the battery performance, different conditions are required and achieved by control sub-systems, integrated into battery and module construction. The electronic management system presented in this paper aims to optimize the use of the battery making the overall system more reliable and cost effective. On the one hand, a research algorithm of the optimal power to charge and discharge an advanced lithium-ion battery for photovoltaic application is necessary to obtain an optimum electronic management system. On the other hand, a Maximum Power Point Tracking is also incorporated into the electronic control unit, to optimize the solar array production under varying atmospheric conditions. This paper will describe a new concept of an integrated multifunctional module using lithium-ion batteries and new control algorithms.
    Conference Record of the IEEE Photovoltaic Specialists Conference 01/2008;
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    ABSTRACT: Maximum Power Point Tracker (MPPT) is often used to increase the energy conversion efficiency for intermittent energy sources. Numerous of research teams work today to improve this type of algorithms. We had developed real-time MPPT controls based on the Extremum Seeking Control principle first implemented on analogical circuit. Today, to be more flexible and adaptive with several structures of power static converters, our new MPPT algorithms are implemented on numerical circuits. Our aim is to obtain high performances. To achieve a high quality matching between sources and loads, our new MPPT control adjusts continually the static converter duty cycle. Transitory effects are immediately detected and new MPP rapidly recovered. In addition, this digital control has an adjustment delay which allows an adaptation to a large power range from high to low points and then a real optimisation. Experimental results validate the global behaviour of this control for photovoltaic systems.
    Industrial Electronics, 2007. ISIE 2007. IEEE International Symposium on; 07/2007
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    Cedric Cabal
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    ABSTRACT: Une chaîne de conversion photovoltaïque signifie aujourd'hui un générateur photovoltaïque (GPV) connecté à une charge par l'intermédiaire d'un convertisseur. Selon l'application visée, l'énergie photovoltaïque est soit utilisée telle quelle par la charge, soit stockée ou bien injectée directement au réseau électrique. L'optimisation de la production de cette énergie reste encore du domaine de la recherche et beaucoup d'innovations sont encore nécessaires pour en faire une énergie fiable. De nos jours, les axes de recherche pour augmenter la production de cette énergie sont principalement focalisés sur l'extraction de la puissance maximale, mais très peu de solutions sont proposées pour améliorer l'efficacité énergétique de la chaîne de conversion dans son ensemble. Cette thèse est focalisée sur l'optimisation des performances des étages d'adaptation. Ainsi, des améliorations sont proposées sur les différentes parties constituant la chaîne de conversion. Le haut degré d'intégration et la flexibilité apportés par le domaine digital nous ont poussés vers la numérisation de commandes MPPT élaborées sur le principe de commande extrémale. L'amélioration de l'étage de conversion est illustrée au travers de deux structures, inspirées de méthodes couramment utilisées dans les applications de fortes puissances comme la mise en parallèle de convertisseurs DC-DC fonctionnant en mode interleaving. De nouvelles propriétés, intrinsèques à des structures semigiratrices de puissance, renforcent l'étude. Une nouvelle architecture basée sur la discrétisation de chaque générateur photovoltaïque est ainsi proposée comme pouvant être le meilleur compromis en termes de transfert d'énergie solaire.