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1 to 35 of 35 results
  • Development and testing of a bidirectional distribution electronic power transformer model

     Alepuz Menendez, Salvador; González, Francisco; Martín-Arnedo, Jacinto; Martinez Velasco, Juan Antonio
    Electric power systems research
    Vol. 107, p. 230-239
    DOI: 10.1016/j.epsr.2013.10.010
    Date of publication: 2014-02
    Journal article

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    Transformer size can be significantly reduced by increasing the operating frequency, which may be achieved by means of power electronics converters installed as interfaces to the power frequency systems at both transformer sides. In this work, a model for a bidirectional high-frequency power electronic transformer is presented. Several case studies have been carried out in order to evaluate the behavior of the transformer under different operating conditions and test the impact on the power quality. The results show that the electronic power transformer, also known as solid-state transformer, not only matches the functions of a conventional power transformer, but also provides additional capabilities to mitigate dynamic power quality problems.

  • Analysis of the fault-tolerance capacity of the multilevel active-clamped converter

     Nicolás Apruzzese, Joan; Busquets Monge, Sergio; Bordonau Farrerons, Jose; Alepuz Menendez, Salvador; Calle Prado, Alejandro
    IEEE transactions on industrial electronics
    Vol. 60, num. 11, p. 4773-4783
    DOI: 10.1109/TIE.2012.2222856
    Date of publication: 2013
    Journal article

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    Thanks to the inherent redundancy to generate the different output voltage levels, the multilevel active-clamped (MAC) topology presents an important fault-tolerance ability which makes it interesting for several applications. This paper presents an analysis of the fault-tolerance capacity of the MAC converter. Both open-circuit and short-circuit faults are considered, and the analysis is carried out under single-device and two simultaneous device faults. Switching strategies and different hardware modifications to overcome the limitations caused by faults are proposed. Experimental tests with a four-level MAC prototype are presented to validate the analysis.

    Thanks to the inherent redundancy to generate the different output voltage levels, the multilevel active-clamped (MAC) topology presents an important fault-tolerance ability which makes it interesting for several applications. This paper presents an analysis of the fault-tolerance capacity of the MAC converter. Both open-circuit and short-circuit faults are considered, and the analysis is carried out under single-device and two simultaneous device faults. Switching strategies and different hardware modifications to overcome the limitations caused by faults are proposed. Experimental tests with a four-level MAC prototype are presented to validate the analysis.

  • Use of stored energy in PMSG rotor inertia for low-voltage ride-through in back-to-back NPC converter-based wind power systems

     Alepuz Menendez, Salvador; Calle Prado, Alejandro; Busquets Monge, Sergio; Kouro, Samir; Wu, Bin
    IEEE transactions on industrial electronics
    Vol. 60, num. 5, p. 1787-1796
    DOI: 10.1109/TIE.2012.2190954
    Date of publication: 2013-05
    Journal article

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  • Predictive current control of a back-to-back NPC wind energy conversion system to meet low voltage ride-through requirements

     Alepuz Menendez, Salvador; Calle Prado, Alejandro; Busquets Monge, Sergio; Nicolás Apruzzese, Joan; Bordonau Farrerons, Jose
    Annual Conference of the IEEE Industrial Electronics Society
    p. 5304-5309
    Presentation's date: 2013-11-13
    Presentation of work at congresses

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    Predictive current control is applied to a wind energy conversion system implemented with a permanent-magnet synchronous generator connected to the grid through a back-toback neutral-point-clamped converter. This control approach allows to work in steady-state and to fulfill the low-voltage ride through requirements demanded by the power system operators. Dc-link neutral point voltage balance is also achieved by means of the predictive control algorithm.

    Predictive current control is applied to a wind energy conversion system implemented with a permanent-magnet synchronous generator connected to the grid through a back-toback neutral-point-clamped converter. This control approach allows to work in steady-state and to fulfill the low-voltage ride through requirements demanded by the power system operators.Dc-link neutral point voltage balance is also achieved by means of the predictive control algorithm.

  • Experimental efficiency comparison between a four-level active-clamped and a two-level topology

     Nicolás Apruzzese, Joan; Busquets Monge, Sergio; Bordonau Farrerons, Jose; Alepuz Menendez, Salvador; Calle Prado, Alejandro; Filbà Martínez, Àlber
    Annual Conference of the IEEE Industrial Electronics Society
    p. 6225-6230
    Presentation's date: 2013-11-11
    Presentation of work at congresses

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    This paper presents an efficiency analysis of a recently-published topology, the multilevel-active-clamped (MAC) topology. In order to assess the MAC topology, an efficiency comparison between a four-level MAC leg and a conventional two-level leg operating in low voltage is carried out. First, overall losses of both topologies are estimated. Then, experimental tests to measure their overall losses and their efficiency are presented. Finally, obtained results from the experimental tests are compared with the estimations to substantiate the analysis. The efficiency of the MAC topology is higher in all the switching-frequency range.

    This paper presents an efficiency analysis of a recently-published topology, the multilevel-active-clamped (MAC) topology. In order to assess the MAC topology, an efficiency comparison between a four-level MAC leg and a conventional two-level leg operating in low voltage is carried out. First, overall losses of both topologies are estimated. Then, experimental tests to measure their overall losses and their efficiency are presented. Finally, obtained results from the experimental tests are compared with the estimations to substantiate the analysis. The efficiency of the MAC topology is higher in all the switching-frequency range.

  • Solid state transformer with low-voltage ride-through and current unbalance management capabilities

     Alepuz Menendez, Salvador; González, Francisco; Martín-Arnedo, Jacinto; Martinez Velasco, Juan Antonio
    Annual Conference of the IEEE Industrial Electronics Society
    p. 1276-1281
    Presentation's date: 2013-11-12
    Presentation of work at congresses

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    The solid state transformer is an emerging technology which aims at replacing the conventional lowfrequency power transformer by means of a high-frequency transformer driven by a proper AC/AC power electronics conversion system, at both transformer sides. In comparison with the conventional power transformer, the solid state transformer provides extended and enhanced operating capabilities that can be achieved with an appropriate controller design for the power electronics converters. In this work, the interaction of the solid state transformer with a distribution system is analyzed under different operating conditions. Bidirectional active power flow, full reactive power control, low-voltage side current unbalance management and high-voltage side low-voltage ride-through are achieved with the proposed control approach.

    The solid state transformer is an emerging technology which aims at replacing the conventional lowfrequency power transformer by means of a high-frequency transformer driven by a proper AC/AC power electronics conversion system, at both transformer sides. In comparison with the conventional power transformer, the solid state transformer provides extended and enhanced operating capabilities that can be achieved with an appropriate controller design for the power electronics converters. In this work, the interaction of the solid state transformer with a distribution system is analyzed under different operating conditions. Bidirectional active power flow, full reactive power control, low-voltage side current unbalance management and high-voltage side low-voltage ride-through are achieved with the proposed control approach.

  • Técnicas avanzadas de convertidores electrónicos de potencia multinivel de ca aplicadas al uso racional de la energía eléctrica

     Alepuz Menendez, Salvador; Busquets Monge, Sergio; Calle Prado, Alejandro; Nicolás Apruzzese, Joan; Peracaula Roura, Joan; Bordonau Farrerons, Jose
    Competitive project

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  • A Bidirectional Multilevel Boost¿Buck DC¿DC Converter

     Busquets Monge, Sergio; Alepuz Menendez, Salvador; Bordonau Farrerons, Jose
    IEEE transactions on power electronics
    Vol. 26, num. 8, p. 2172-2183
    DOI: 10.1109/TPEL.2011.2105508
    Date of publication: 2011-08-08
    Journal article

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  • Fault-tolerance capacity of the multilevel active-clamped topology

     Nicolás Apruzzese, Joan; Busquets Monge, Sergio; Bordonau Farrerons, Jose; Alepuz Menendez, Salvador; Calle Prado, Alejandro
    IEEE Energy Conversion Congress and Exposition
    p. 3411-3418
    DOI: 10.1109/ECCE.2011.6064230
    Presentation's date: 2011-09-22
    Presentation of work at congresses

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    Thanks to the inherent redundancy to generate the different output voltage levels, the multilevel active clamped (MAC) topology presents an important fault-tolerance ability which makes it interesting for several applications. This paper presents an analysis of the fault-tolerance capacity of the MAC converter. Both open-circuit and short-circuit faults are considered and the analysis is carried out under single-device and two-simultaneous-device faults. Switching strategies to overcome the limitations caused by faults are proposed. Experimental tests with a four-level MAC prototype are presented to validate the analysis.

  • Fault-tolerance capacity of the multilevel active clamped topology

     Nicolás Apruzzese, Joan; Busquets Monge, Sergio; Bordonau Farrerons, Jose; Alepuz Menendez, Salvador; Calle Prado, Alejandro
    IEEE Energy Conversion Congress and Exposition
    p. 3411-3418
    DOI: 10.1109/ECCE.2011.6064230
    Presentation's date: 2011
    Presentation of work at congresses

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    Thanks to the inherent redundancy to generate the different output voltage levels, the multilevel active clamped (MAC) topology presents an important fault-tolerance ability which makes it interesting for several applications. This paper presents an analysis of the fault-tolerance capacity of the MAC converter. Both open-circuit and short-circuit faults are considered and the analysis is carried out under single-device and two-simultaneous-device faults. Switching strategies to overcome the limitations caused by faults are proposed. Experimental tests with a four-level MAC prototype are presented to validate the analysis.

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    Control scheme for low voltage ride-through compliance in back-to-back NPC converter based wind power systems  Open access

     Alepuz Menendez, Salvador; Calle Prado, Alejandro; Busquets Monge, Sergio; Bordonau Farrerons, Jose; Kouro, Samir; Wu, Bin
    IEEE International Symposium on Industrial Electronics
    p. 2357-2362
    DOI: 10.1109/ISIE.2010.5637478
    Presentation's date: 2010-07-07
    Presentation of work at congresses

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    The increasing influence of wind power in the power system operation has caused the power system operators to include wind power plants in the control of the overall power system, both in steady-state and transient operation. Therefore, the grid connection requirements of the power system operators involve wind power systems. Low voltage ride-through requirement is probably the most demanding grid connection requirement to meet, at least from the point of view of the wind energy conversion system. In presence of grid voltage dips, the low voltage ride-through compliance produces a mismatch between the generated active power and the active power delivered to the grid. The management of this mismatch supposes a challenge for the wind energy conversion system. In this work, a control scheme for the back-to-back neutral-pointclamped converter is proposed. Under grid voltage dip, the controllers for generator-side and grid-side converters work concurrently to meet the low voltage ride-through requirement by storing the active power surplus in the inertia of the generator and keeping constant the dc-link voltage. Simulation results verify the proposed control scheme.

  • Convertidor trifásico de tres niveles NPC con eliminación selectiva de armónicos conectado a la red ante la presencia de huecos de tensión

     Calle Prado, Alejandro; Alepuz Menendez, Salvador; Bordonau Farrerons, Jose; Kouro, Samir; Busquets Monge, Sergio
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    p. 308-313
    Presentation's date: 2010-07-07
    Presentation of work at congresses

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  • DISEÑO E IMPLEMENTACIÓN DE NANOREDES PARA APLICACIONES DOMÉSTICAS, COMERCIALES..

     Alepuz Menendez, Salvador; Busquets Monge, Sergio; Calle Prado, Alejandro; Nicolás Apruzzese, Joan; Bordonau Farrerons, Jose
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  • Advanced Wide Band Gap Semiconductor Devices for Rational Use of Energy (RUE)

     Alepuz Menendez, Salvador; Busquets Monge, Sergio; Calle Prado, Alejandro; Nicolás Apruzzese, Joan; Peracaula Roura, Joan; Filbà Martínez, Àlber; Bordonau Farrerons, Jose
    Competitive project

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    Control methods for low voltage ride-through compliance in grid-connected NPC converter based wind power systems using predictive control  Open access

     Alepuz Menendez, Salvador; Busquets Monge, Sergio; Bordonau Farrerons, Jose; Cortés, Patricio; Kouro, Samir
    IEEE Energy Conversion Congress and Exposition
    p. 363-369
    DOI: 10.1109/ECCE.2009.5316139
    Presentation's date: 2009-09
    Presentation of work at congresses

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    In presence of grid voltage dips, Low Voltage Ride-Through (LVRT) requirements demand the wind power plant to remain connected to the grid, helping the network to keep voltage and frequency stable. Neutral-Point-Clamped (NPC) converters are appropriate for wind power systems, because the current trend of increasing voltage levels. Predictive current control presents as fast dynamic response and accurate reference tracking as other well established control methods, while providing more flexibility. In this work, three different control strategies are applied to the grid-side NPC converter, in order to fulfil LVRT requirements, which are implemented with the predictive current control technique. Dc-link neutral point voltage is kept balanced by the predictive control algorithm, using the redundant switching states of the NPC converter. Simulation results confirm the validity of the proposed control approach.

    This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.

  • A novel bidirectional multilevel boost-buck dc-dc converter

     Busquets Monge, Sergio; Alepuz Menendez, Salvador; Bordonau Farrerons, Jose
    IEEE Energy Conversion Congress and Exposition
    p. 707-714
    DOI: 10.1109/ECCE.2009.5316357
    Presentation's date: 2009-09
    Presentation of work at congresses

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    2 transistors + 2 diodes-based PEBB designed for general applications in power electronics  Open access

     Nicolás Apruzzese, Joan; Rocabert Delgado, Joan; Bordonau Farrerons, Jose; Busquets Monge, Sergio; Alepuz Menendez, Salvador; Martinez Velasco, Juan Antonio; Peracaula Roura, Joan
    European Conference on Power Electronics and Applications
    p. 1-10
    Presentation's date: 2009-09
    Presentation of work at congresses

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    This paper presents a new Power Electronic Building Block (PEBB) designed to facilitate the implementation of different power converter topologies. The proposed PEBB consists of two diodes and two transistors and it can be used to implement the most relevant power converter topologies, due to its modularity. The addition of the two diodes is an exclusive feature of the new PEBB, which permits to implement neutral point clamped (NPC) multilevel converters. The application of the PEBB to build a three-level NPC converter and a dc-dc push-pull converter is presented and detailed in the paper, and demonstrate that the presented PEBB can be useful to shorten converter development times.

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    Three-level three-phase neutral-point-clamped back-to-back converter applied to a wind emulator  Open access

     Calle Prado, Alejandro; Rocabert Delgado, Joan; Busquets Monge, Sergio; Bordonau Farrerons, Jose; Alepuz Menendez, Salvador; Peracaula Roura, Joan
    European Conference on Power Electronics and Applications
    p. 1-10
    Presentation's date: 2009-09
    Presentation of work at congresses

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    This paper presents a three-level three- phase neutral-point-clamped back-to-back converter applied to a wind emulator, where a wind power generator is connected to the grid through the back-to-back converter. The converter regulates the power extracted from the generator and controls how this power is injected to the grid with the desired power factor. Two phase locked loops are in charge of synchronizing the generator-side and the grid-side converters, regardless of the rotor speed of the generator. DC-link neutral point voltage balance is performed by the modulation strategy of the backto- back converter. Simulation and experimental results are provided to verify the correct performance of the system.

  • Pulsewidth modulations for the comprehensive capacitor voltage balance of n-level two-leg diode-clamped converters

     Busquets Monge, Sergio; Alepuz Menendez, Salvador; Rocabert Delgado, Joan; Bordonau Farrerons, Jose
    IEEE transactions on power electronics
    Vol. 24, num. 8, p. 1951-1959
    DOI: 10.1109/TPEL.2009.2017918
    Date of publication: 2009-08
    Journal article

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    In the previous literature, the introduction of the virtual space vector concept for the three-level three-leg neutral-point-clamped converter has led to the definition of pulsewidth modulation (PWM) strategies guaranteeing the dc-link capacitor voltage balance under any type of load, with the only requirement being that the addition of the three phase currents equals zero. This paper presents the definition of the virtual space vectors for the general case of an n-level converter, suggests guidelines for designing virtual-space-vector PWM strategies, and provides the expressions of the phase duty-ratio waveforms corresponding to this family of PWMs. Modulations defined upon these vectors enable the use of diode-clamped topologies with passive front-ends. The performance of these converters operated with the proposed PWMs is compared to the performance of alternative designs through analysis, simulation and experiments.

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    Control strategies based on symmetrical components for grid-connected converters under voltage dips  Open access

     Alepuz Menendez, Salvador; Busquets Monge, Sergio; Bordonau Farrerons, Jose; Martinez Velasco, Juan Antonio; Silva, César A.; Pontt, Jorge; Rodríguez, José
    IEEE transactions on industrial electronics
    Vol. 56, num. 6, p. 2162-2173
    Date of publication: 2009-06
    Journal article

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    Low-voltage ride-through (LVRT) requirements demand wind-power plants to remain connected to the network in presence of grid-voltage dips. Most dips present positive-, negative-, and zero-sequence components. Hence, regulators based on symmetrical components are well suited to control gridconnected converters. A neutral-point-clamped topology has been considered as an active front end of a distributed power-generation system, following the trend of increasing power and voltage levels in wind-power systems. Three different current controllers based on symmetrical components and linear quadratic regulator have been considered. The performance of each controller is evaluated on LVRT requirement fulfillment, grid-current balancing, maximum grid-current value control, and oscillating power flow. Simulation and experimental results show that all three controllers meet LVRT requirements, although different system performance is found for each control approach. Therefore, controller selection depends on the system constraints and the type of preferred performance features.

  • Erratum to "Voltage balancing control of diode-clamped multilevel converters with passive front-ends" [Jul 08 1751-1758]

     Busquets Monge, Sergio; Alepuz Menendez, Salvador; Bordonau Farrerons, Jose; Peracaula Roura, Joan
    IEEE transactions on power electronics
    Vol. 24, num. 6, p. 1666
    DOI: 10.1109/TPEL.2008.2012333
    Date of publication: 2009-06
    Journal article

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  • Pulsewidth modulations for the comprehensive capacitor voltage balance of n-level three-leg diode-clamped converters

     Busquets Monge, Sergio; Alepuz Menendez, Salvador; Rocabert Delgado, Joan; Bordonau Farrerons, Jose
    IEEE transactions on power electronics
    Vol. 24, num. 5, p. 1364-1375
    DOI: 10.1109/TPEL.2009.2016661
    Date of publication: 2009-05
    Journal article

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  • Pulsewidth modulations for the comprehensive capacitor voltage balance of diode-clamped multilevel converters

     Busquets Monge, Sergio; Alepuz Menendez, Salvador; Rocabert Delgado, Joan; Bordonau Farrerons, Jose
    Center for Power Electronics Systems Annual Conference
    Presentation's date: 2009-04-07
    Presentation of work at congresses

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  • Predictive current control of grid-connected neutral-point-clamped converters to meet low voltage ride-through requirements

     Alepuz Menendez, Salvador; Busquets Monge, Sergio; Bordonau Farrerons, Jose; Cortés, P; Rodríguez, J; Vargas, R
    39th IEEE Power Electronics Specialists Conference. PESC 2008
    p. 2423-2428
    Presentation of work at congresses

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  • Comparación de estrategias de control de corriente para verificar los requisitos de conexión a red en generación distribuida

     Alepuz Menendez, Salvador; Busquets Monge, Sergio; Salaet Pereira, Juan Fernando; Rocabert Delgado, Joan; Bordonau Farrerons, Jose; Peracaula Roura, Joan
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    p. 1-6
    Presentation of work at congresses

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  • Finite-states model predictive control of a four-level diode-clamped inverter

     Cortés, P; Rodríguez, J; Alepuz Menendez, Salvador; Busquets Monge, Sergio; Bordonau Farrerons, Jose
    39th IEEE Power Electronics Specialists Conference. PESC 2008
    p. 2203-2208
    Presentation of work at congresses

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  • Pulsewidth modulations for the comprehensive capacitor voltage balance of n-level diode-clamped converters

     Busquets Monge, Sergio; Alepuz Menendez, Salvador; Rocabert Delgado, Joan; Bordonau Farrerons, Jose
    39th IEEE Power Electronics Specialists Conference. PESC 2008
    p. 4479-4486
    Presentation of work at congresses

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  • Multilevel diode-clamped converter for photovoltaic generators with independent voltage control of each solar array

     Busquets Monge, Sergio; Rocabert Delgado, Joan; Rodriguez Cortes, Pedro; Alepuz Menendez, Salvador; Bordonau Farrerons, Jose
    IEEE transactions on industrial electronics
    Vol. 55, num. 7, p. 2713-2723
    Date of publication: 2008-07
    Journal article

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  • SUCCESS. Searching Unprecedented Cooperations on Climate and Energy to ensure Sustainability

     Bordonau Farrerons, Jose; Alepuz Menendez, Salvador; Busquets Monge, Sergio; Calle Prado, Alejandro; Nicolás Apruzzese, Joan; Peracaula Roura, Joan; Sumper, Andreas
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  • Balanced grid currents in three-level voltage-source inverters connected to the utility under distorted condition using symmetrical components and linear quadratic regulator

     Alepuz Menendez, Salvador; Busquets Monge, Sergio; Bordonau Farrerons, Jose; Pontt, J; Silva, C; Rodríguez, J
    European Conference on Power Electronics and Applications
    p. 1-10
    Presentation of work at congresses

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  • Interfacing Renewable Energy Sources to the Utility Grid using a Three level Inverter

     Alepuz Menendez, Salvador; Busquets Monge, Sergio; Bordonau Farrerons, Jose; Gago Barrio, Javier; Gonzalez Diez, David; Balcells Sendra, Josep
    IEEE transactions on industrial electronics
    Vol. 53, num. 5, p. 1504-1511
    Date of publication: 2006-10
    Journal article

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  • SIST.DE GENERACIÓN EÓLICA DE MEDIA TENSIÓN MEDIANTE EL USO DE CONVERTIDORES MULTINIVEL

     Bordonau Farrerons, Jose; Alepuz Menendez, Salvador; Garín, I
    Date of request: 2006-10-25
    Invention patent

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    Sistema de Generación Eólica de Media Tensión mediante el uso de Convertidores Multinivel.

    En esta patente se propone el uso de convertidores multinivel en configuración Back-to-Back para componer un sistema de generación eólica de media tensión. El uso de convertidores multinivel posibilita el trabajar a mayores tensiones y poder conectar el aerogenerador a una red de Media Tensión sin necesidad de usar un transformador elevador de acoplamiento.

  • Load voltage and output current control of three-level voltage source inverters

     Alepuz Menendez, Salvador
    Annual Conference of the IEEE Industrial Electronics Society
    Presentation's date: 2005-11-06
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  • Load voltage and output current control of three-level voltage source inverters

     Alepuz Menendez, Salvador; Salaet Pereira, Juan Fernando; Busquets Monge, Sergio; Bordonau Farrerons, Jose
    Annual Conference of the IEEE Industrial Electronics Society
    p. 739-744
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  • APORTACIÓ AL CONTROL DEL CONVERTIDOR CC/CA DE TRES NIVELLS  Open access

     Alepuz Menendez, Salvador
    Department of Electronic Engineering, Universitat Politècnica de Catalunya
    Theses

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    La presente tesis estudia, propone y realiza sus principales aportaciones en el campo del control para el convertidor CC/CA de tres niveles, sobre la topología denominada Neutral-Point-Clamped, aunque se puede extender a otras topologías y/o número de niveles. Se presenta una metodología de modelado que emplea funciones de conmutación de fase, el operador de promediado y la transformación D-Q, tal que los modelos obtenidos en el dominio D-Q contienen una información completa sobre la dinámica del sistema. La estrategia de conmutación se puede entender como una extensión de la estrategia PWM senoidal de dos a tres niveles. Esta estrategia es simple y no realiza el control de ninguna de las variables del sistema. En esta tesis, el controlador se encarga de regular todas las variables del sistema, incluido el equilibrio del bus de continua. Este es un enfoque diferente del convencional, donde el equilibrio del bus de continua se consigue mediante la elección adecuada de los estados redundantes del convertidor en la estrategia de conmutación, mientras que el resto de variables se regulan a través del controlador. Para la realización del controlador, se propone la técnica de control lineal multivariable LQR (Linear Quadratic Regulator), complementada con la técnica de control no lineal adaptativo denominada programación de ganancia (Gain Scheduling). Se presenta, además, una metodología de cálculo del controlador. Este control es versátil, abierto y adaptable. En cualquier caso, el controlador se puede adaptar a las necesidades concretas de cada aplicación. El cálculo del controlador se realiza mediante simulación con MatLab-Simulink. Los modelos matemáticos que emplean las funciones de conmutación del convertidor son aquellos que ofrecen un mejor compromiso entre velocidad de simulación y precisión. Para validar el control propuesto, se ha diseñado y construido un equipo experimental donde el controlador se ha mostrado aplicable, útil y eficaz en la regulación de las distintas cargas y aplicaciones experimentadas, incluso con carga no lineal, bajo diferentes condiciones de trabajo y variables a controlar, tanto en régimen permanente como en procesos transitorios. La rapidez y calidad de la respuesta transitoria es comparable a la de otros sistemas de control publicados. Es especialmente interesante el excelente control conseguido del equilibrio del bus de continua. Además, la robustez del control permite cancelar el error estacionario aunque diferentes parámetros del sistema presenten desviaciones significativas respecto los valores esperados. El uso de la programación de ganancia junto con la técnica LQR se ha mostrado muy efectivo, puesto que permite realizar diferentes tipos de control. Se ha comprobado la congruencia entre simulaciones y resultados experimentales obtenidos, lo que valida los modelos de simulación empleados y el proceso de diseño del controlador mediante simulación.

    This dissertation study, propose and carry out the main contributions in the field of three-level inverter control, using the topology Neutral-Point-Clamped, although results can be extended to other topologies and/or number of levels. A procedure for modelling is presented, based on line-switching functions, moving average operator and D-Q transformation. Then, the obtained models in D-Q frame contain complete information about system dynamics. Switching strategy is simple and can be considered as an extension of two-level sinusoidal PWM to three level. The system variables are not controlled by the switching strategy. In this work, all the system variables are controlled by the regulator, including DC-link balance. This control approach is different than the conventional one, where DC-link balance is achieved by means of a proper selection of redundant states in the switching strategy, and the other variables are controlled by the regulator. The regulator is based on the multivariable linear control technique LQR (Linear Quadratic Regulator), in combination with the non-linear adaptive control technique Gain Scheduling. Moreover, a methodology for the calculation of the controller is presented. This controller is versatile, open and adaptable. However, the controller can be built depending on the concrete specifications of each application. The controller is calculated by means of simulation using MatLab-Simulink. The mathematical models based on the switching functions of the converter give the best trade-off between simulation speed and precision. In order to validate the proposed controller, an experimental prototype has been designed and implemented. Experimental results show that the controller is useful and effective for the regulation of different loads and applications, even with non-linear loads, different operation points and variables to control, in steady-state and transitory operation. Dynamic response speed and quality are similar to other control systems in the literature. The DC-link balance control achieved is specially interesting. Furthermore, steady-state error is cancelled due to the robustness of the controller, even though significant deviation of different system parameters are present. The use of Gain-Scheduling in combination with LQR is effective, allowing the calculation of regulators with different control strategies. Good agreement between simulations and experimental results has been found. This result validates simulation models and the design method for the controller, based on simulations.