Documents disponibles écrits par cet auteur

Design of delta-modulated generalized frequency converter / Agarwal, Anshul in IEEE transactions on industrial electronics, Vol. 57 N° 11 (Novembre 2010) 

Public ISBD [article]  in IEEE transactions on industrial electronics > Vol. 57 N° 11 (Novembre 2010) . - pp. 3724 - 3729 Titre : Design of delta-modulated generalized frequency converter Type de document : texte imprimé Auteurs : Agarwal, Anshul, Auteur ; Agarwal, Vineeta, Auteur Année de publication : 2011 Article en page(s) : pp. 3724 - 3729 Note générale : Génie électrique Langues : Anglais (eng) Mots-clés : Cycloinverter  Delta  modulation  Harmonic  reduction Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : This paper proposes a novel power electronic application, which is an IGBT-based frequency converter that performs the function of both cycloconverter and cycloinverter by changing the 2-b input parameter. It finds its application in speed control of induction motor, induction heating, fluorescent lighting, ballast, high-frequency power supplies, and so many other applications. A methodology is developed to generate the trigger signals for various IGBTs used in frequency converters such that the circuit is not restricted to a particular value of output frequency but it can produce any output frequency that is an integer multiple of the input supply frequency. The output of the converter has been improved using delta-modulation technique. Hardware design is obtained using readily available ICs and other components. The trigger circuit has been tested qualitatively by observing waveforms on CRO. The operation of the proposed system has been found to be satisfactory. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5409606 [article] Design of delta-modulated generalized frequency converter [texte imprimé] / Agarwal, Anshul, Auteur ; Agarwal, Vineeta, Auteur . - 2011 . - pp. 3724 - 3729. Génie électrique Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 57 N° 11 (Novembre 2010) . - pp. 3724 - 3729 Mots-clés : Cycloinverter  Delta  modulation  Harmonic  reduction Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : This paper proposes a novel power electronic application, which is an IGBT-based frequency converter that performs the function of both cycloconverter and cycloinverter by changing the 2-b input parameter. It finds its application in speed control of induction motor, induction heating, fluorescent lighting, ballast, high-frequency power supplies, and so many other applications. A methodology is developed to generate the trigger signals for various IGBTs used in frequency converters such that the circuit is not restricted to a particular value of output frequency but it can produce any output frequency that is an integer multiple of the input supply frequency. The output of the converter has been improved using delta-modulation technique. Hardware design is obtained using readily available ICs and other components. The trigger circuit has been tested qualitatively by observing waveforms on CRO. The operation of the proposed system has been found to be satisfactory. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5409606

Superstructure - based optimal synthesis of pressure swing adsorption cycles for precombustion CO2 capture / Agarwal, Anshul in Industrial & engineering chemistry research, Vol. 49 N° 11 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5066–5079 Titre : Superstructure - based optimal synthesis of pressure swing adsorption cycles for precombustion CO2 capture Type de document : texte imprimé Auteurs : Agarwal, Anshul, Auteur ; Lorenz T. Biegler, Auteur ; Stephen E. Zitney, Auteur Année de publication : 2010 Article en page(s) : pp. 5066–5079 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Adsorption  Precombustion Résumé : Pressure/vacuum swing adsorption (PSA/VSA) technology has been widely applied for H2 production from the effluent streams of a shift converter, which predominantly comprises H2 and CO2 with other trace components. It also offers significant advantages for precombustion CO2 capture in terms of performance, energy requirements, and operating costs since the shifted synthesis gas (syngas) is available for separation at a high pressure with a high CO2 concentration. Most commercial PSA cycles have been developed to recover H2 at very high purity and do not focus on enriching the strongly adsorbed CO2. Thus, a major limitation exists with the use of these conventional PSA cycles for high purity CO2 capture. Furthermore, complex dynamic behavior of PSA processes together with the numerical difficulties of the model governed by partial differential and algebraic equations (PDAEs) makes the evaluation and assessment of different operating steps and cycle configurations difficult and time-consuming. Therefore, a systematic methodology is essential to design and optimize PSA cycles to recover both H2 and CO2 at a high purity. Recent advances in large-scale optimization strategies for process synthesis have enabled us to address this issue with the help of a systematic optimization-based formulation. In particular, we present a superstructure-based approach to simultaneously determine optimal cycle configurations and design parameters for PSA units. The superstructure is capable to predict a rich set of different PSA operating steps, which are accomplished by manipulating the bed connections with the help of time dependent control variables. An optimal sequence of operating steps is achieved through the formulation of an optimal control problem with the PDAEs of the PSA system. Numerical results for case-studies related to precombustion CO2 capture from a shifted syngas feed mixture having hydrogen and carbon dioxide are presented. In particular, optimal PSA cycles are synthesized which maximize CO2 recovery or minimize overall power consumption. The results show the potential of the superstructure to predict PSA cycles with purities as high as 99% for H2 and 96% for CO2. Moreover, these cycles can recover more than 92% of CO2 with a power consumption as low as 46.8 kW h/tonne CO2 captured. The approach presented is therefore quite useful for evaluating the suitability of different operating strategies for PSA processes. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900873j [article] Superstructure - based optimal synthesis of pressure swing adsorption cycles for precombustion CO2 capture [texte imprimé] / Agarwal, Anshul, Auteur ; Lorenz T. Biegler, Auteur ; Stephen E. Zitney, Auteur . - 2010 . - pp. 5066–5079. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5066–5079 Mots-clés : Adsorption  Precombustion Résumé : Pressure/vacuum swing adsorption (PSA/VSA) technology has been widely applied for H2 production from the effluent streams of a shift converter, which predominantly comprises H2 and CO2 with other trace components. It also offers significant advantages for precombustion CO2 capture in terms of performance, energy requirements, and operating costs since the shifted synthesis gas (syngas) is available for separation at a high pressure with a high CO2 concentration. Most commercial PSA cycles have been developed to recover H2 at very high purity and do not focus on enriching the strongly adsorbed CO2. Thus, a major limitation exists with the use of these conventional PSA cycles for high purity CO2 capture. Furthermore, complex dynamic behavior of PSA processes together with the numerical difficulties of the model governed by partial differential and algebraic equations (PDAEs) makes the evaluation and assessment of different operating steps and cycle configurations difficult and time-consuming. Therefore, a systematic methodology is essential to design and optimize PSA cycles to recover both H2 and CO2 at a high purity. Recent advances in large-scale optimization strategies for process synthesis have enabled us to address this issue with the help of a systematic optimization-based formulation. In particular, we present a superstructure-based approach to simultaneously determine optimal cycle configurations and design parameters for PSA units. The superstructure is capable to predict a rich set of different PSA operating steps, which are accomplished by manipulating the bed connections with the help of time dependent control variables. An optimal sequence of operating steps is achieved through the formulation of an optimal control problem with the PDAEs of the PSA system. Numerical results for case-studies related to precombustion CO2 capture from a shifted syngas feed mixture having hydrogen and carbon dioxide are presented. In particular, optimal PSA cycles are synthesized which maximize CO2 recovery or minimize overall power consumption. The results show the potential of the superstructure to predict PSA cycles with purities as high as 99% for H2 and 96% for CO2. Moreover, these cycles can recover more than 92% of CO2 with a power consumption as low as 46.8 kW h/tonne CO2 captured. The approach presented is therefore quite useful for evaluating the suitability of different operating strategies for PSA processes. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900873j