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  • Active power estimation of photovoltaic generators for distribution network planning based on correlation models

     Ramón Marín, Miquel; Sumper, Andreas; Villafafila Robles, Roberto; Bergas Jane, Joan Gabriel
    03605442
    Date of publication: 2014-01-01
    Journal article

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    For the last years, PV (photovoltaic) generation has been having an important impact on LV (low voltage) and MV (medium voltage) grids in Spain, due to the increasing number of installations. As power monitoring of the generation is in most cases not required, utilities are forced to make assumptions on PV power generation in order to perform network planning studies for both peak demand and contingency analysis. These assumptions increase errors committed during the analysis, as the number of PV installations increases. This paper presents a methodology for estimating PV active power generation values for planning purposes in MV and LV power systems, from historic generation data, based on the development of correlation models. This methodology is applied to three different examples, using predictors based on real registered data. The methodology was also applied in a typical grid study and it's error was determined. (C) 2013 Elsevier Ltd. All rights reserved.

  • Distribution system reconfiguration using genetic algorithm based on connected graphs

     Tomoiaga, Bodgan; Chindris, Mircea; Sumper, Andreas; Villafafila Robles, Roberto; Sudria Andreu, Antoni
    Electric power systems research
    Date of publication: 2013-11
    Journal article

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    The reconfiguration of a power distribution system, by exchanging the functional links between its elements, represents one of the most important procedures to improve the performance in the operation of a distribution system. The optimization through reconfiguration (or optimal reconfiguration) of a power distribution system is not a new problem but still represents a difficult one and is specified in some strategies for smart grids. The paper addresses this problem as a single objective one, where, as main criterion, active power losses have been chosen. There is no unique acceptance regarding which approach (based on heuristics, meta-heuristics, genetic algorithms, etc.) is the most proper to use in order to solve this problem. The most important thing is how the specific knowledge of the problem domain is used and modeled in the implementation. Moreover, the indices which can quantify the quality of a reconfiguration method consist in runtime and the obtained solution and these indices can be confirmed only by experimental results. In order to solve the problem (to search and find the optimal solution) an original genetic algorithm based on connected graphs is proposed. Comparative tests performed on some test systems demonstrated the accuracy and the promptness of the proposed algorithm. AbbreviationsPactive power lossesVinodes voltagesI ijelectric current through a branch ijijbinary variable representing the status of a tie line (0 - open, 1 - closed)nthe number of electric system nodespthe number of connected componentsXthe set of power system nodesEthe set of power system lines (branches).

  • Study of optimization design criteria for stand-alone hybrid renewable power systems

     Martínez Díaz, Maria del Mar; Villafafila Robles, Roberto; Montesinos Miracle, Daniel; Sudria Andreu, Antoni
    International Conference on Renewable Energies and Power Quality
    Presentation's date: 2013-03-21
    Presentation of work at congresses

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  • Biomass gasification for off-grid electrification of South-Saharan Africa

     Depoorter Ruelle, Víctor; Olivella Rosell, Pol; Giral Guardia, Jordi; Lladó Jaume, Àngel; Sudria Andreu, Antoni; Villafafila Robles, Roberto
    Congreso Iberoamericano sobre Microrredes con Generación Distribuida de Renovables
    Presentation's date: 2013-09-24
    Presentation of work at congresses

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    The NGO Misión y Desarrollo para Goundi, with the collaboration of the technology transfer centre CITCEA-UPC and the support of the CCD-UPC, is carrying out since 2011 the project Pôle Goundi aiming to electrify Goundi, a village located in the South of Chad. In this sense, the construction of a small-scale power plant which will use local resources to generate electricity is planned. Although the plant is expected to use photovoltaic and thermal solar energies also, biomass gasification has also been prioritized due to the social and economical advantages of spurring agricultural activity in Goundi. Since the installation of the power plant will be done by stages, the first stage of the project has to demonstrate its viability by installing and operating the first 20kW of electrical power. For this, a complete commercial solution which is able to gasify woody biomass has been selected. Currently, the system is being tested before its shipment to Chad and a model which simulates its behaviour has been developed.

  • Energy market regulations for electric vehicle encourage. Study of current frames

     Felisart Serlavos, Bernat; Villafafila Robles, Roberto; Olivella Rosell, Pol; Ramirez Pisco, Rodrigo; Sudria Andreu, Antoni
    Spanish Portuguese Conference on Electrical Engineering
    Presentation's date: 2013-07
    Presentation of work at congresses

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  • Microgrids and emulation of distribution energy resources

     Cheah-Mane, M; Prieto Araujo, Eduardo; Villafafila Robles, Roberto; Sudria Andreu, Antoni; Gomis Bellmunt, Oriol
    Congreso Iberoamericano sobre Microrredes con Generación Distribuida de Renovables
    Presentation's date: 2013-09-23
    Presentation of work at congresses

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    This paper presents the use of emulator devices to represent different elements of a microgrid system. In this sense, the emulation concept and its advantages are explained. Each emulator is implemented by means of power converters which receive a determined power reference according to the energy resource that it means. Therefore, connecting a determined number of these emulators into the same system it is possible to create several microgrid configurations, which will be capable of performing different test and obtaining the same result that in a real system. In the end, as an example of the advantages that the emulators are able to offer, an experimental platform is presented.

  • Development of a laboratory platform for testing new solutions to integrate renewable energy sources in power systems

     Prieto-Araujo, E.; Cheah-Mane, M; Villafafila Robles, Roberto; Gomis Bellmunt, Oriol; Junyent Ferré, Adrià
    European Conference on Power Electronics and Applications
    Presentation's date: 2013-09-04
    Presentation of work at congresses

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  • Assessment of impact of charging infrastructure for electric vehicles on distribution networks

     Villafafila Robles, Roberto; Girbau-Llistuella, F.; Olivella Rosell, Pol; Sudria Andreu, Antoni; Bergas Jane, Joan Gabriel
    European Conference on Power Electronics and Applications
    Presentation's date: 2013-09-05
    Presentation of work at congresses

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    Pareto optimal reconfiguration of power distribution systems using a genetic algorithm based on NSGA-II  Open access

     Tomoiaga, Bogdan; Chindris, Mircea; Sumper, Andreas; Sudria Andreu, Antoni; Villafafila Robles, Roberto
    Energies
    Date of publication: 2013-03-06
    Journal article

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    Reconfiguration, by exchanging the functional links between the elements of the system, represents one of the most important measures which can improve the operational performance of a distribution system. The authors propose an original method, aiming at achieving such optimization through the reconfiguration of distribution systems taking into account various criteria in a flexible and robust approach. The novelty of the method consists in: the criteria for optimization are evaluated on active power distribution systems (containing distributed generators connected directly to the main distribution system and microgrids operated in grid-connected mode); the original formulation (Pareto optimality) of the optimization problem and an original genetic algorithm (based on NSGA-II) to solve the problem in a non-prohibitive execution time. The comparative tests performed on test systems have demonstrated the accuracy and promptness of the proposed algorithm.

    Reconfiguration, by exchanging the functional links between the elements of the system, represents one of the most important measures which can improve the operational performance of a distribution system. The authors propose an original method, aiming at achieving such optimization through the reconfiguration of distribution systems taking into account various criteria in a flexible and robust approach. The novelty of the method consists in: the criteria for optimization are evaluated on active power distribution systems (containing distributed generators connected directly to the main distribution system and microgrids operated in grid-connected mode); the original formulation (Pareto optimality) of the optimization problem and an original genetic algorithm (based on NSGA-II) to solve the problem in a non-prohibitive execution time. The comparative tests performed on test systems have demonstrated the accuracy and promptness of the proposed algorithm.

  • Modeling of second generation HTS cables for grid fault analysis applied to power system simulation

     Del-Rosario Calaf, Gerard; Lloberas Valls, Joaquim; Sumper, Andreas; Granados García, Xavier; Villafafila Robles, Roberto
    IEEE transactions on applied superconductivity
    Date of publication: 2013
    Journal article

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  • Modeling, control and experimental validation of a flywheel-based energy storage device

     Díaz González, Francisco; Sumper, Andreas; Gomis Bellmunt, Oriol; Villafafila Robles, Roberto
    EPE journal
    Date of publication: 2013-06
    Journal article

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    This work deals with the modeling, control and experimental validation of a flywheel-based energy storage device. The system is based on a low-speed rotating disk mechanically coupled to a Permanent Magnet Synchronous Machine (PMSM). The electrical power is exchanged with the external grid by means of a set of back-to-back power converters. These power electronics control the speed of the machine, and thus the active power absorbed or injected by the device, and also regulate the reactive power at the point of common coupling with the external grid. Vector control techniques are used for designing the converter controllers: a field oriented vector control algorithm is implemented for governing the servomotor while an instantaneous power theory-based algorithm is used to manage the active and reactive currents flowing from the grid side converter. The control implementation in the experimental setup has been carried out by means of programming Digital Signal Processors (DSP's). The modeling and control system design has been validated after executing several experiments. Other characteristics such as the torque losses of the system as well as the system performance concerning energy rating, power rating and energy efficiency characteristics are determined experimentally.

  • Heat ventilation and air conditioning (HVAC)

     Villafafila Robles, Roberto; Salom, Jaume
    Date of publication: 2012-04
    Book chapter

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    Modeling and validation of a flywheel energy storage lab-setup  Open access

     Díaz González, Francisco; Sumper, Andreas; Gomis Bellmunt, Oriol; Villafafila Robles, Roberto
    IEEE PES Innovative Smart Grid Technologies
    Presentation of work at congresses

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    This work deals with the modeling, control and experimental validation of a flywheel test bench which is part of IREC's lab-scale microgrid. The storage device has been designed as a proof of concept. It is based on a low-speed rotating disk mechanically coupled to a Permanent Magnet Synchronous Machine. The electrical power is exchanged with the external grid by means of a set of back-to-back power converters. These power electronics control the speed of the machine, and thus the active power absorbed or injected by the device, and also regulate the reactive power at the point of common coupling with the external grid. Vector control techniques are used for designing the converter controllers: a field oriented vector control algorithm is implemented for governing the servomotor while the instantaneous power theory-based algorithm is used to manage the active and reactive currents flowing from the grid side converter. The control implementation in the experimental setup has been carried out by means of programming Digital Signal Processors (DSP's). The modeling and control system design has been validated after executing several experiments.

    This work deals with the modeling, control and experimental validation of a flywheel test bench which is part of IREC’s lab-scale microgrid. The storage device has been designed as a proof of concept. It is based on a low-speed rotating disk mechanically coupled to a Permanent Magnet Synchronous Machine. The electrical power is exchanged with the external grid by means of a set of back-to-back power converters. These power electronics control the speed of the machine, and thus the active power absorbed or injected by the device, and also regulate the reactive power at the point of common coupling with the external grid. Vector control techniques are used for designing the converter controllers: a field oriented vector control algorithm is implemented for governing the servomotor while the instantaneous power theory-based algorithm is used to manage the active and reactive currents flowing from the grid side converter. The control implementation in the experimental setup has been carried out by means of programming Digital Signal Processors (DSP’s). The modeling and control system design has been validated after executing several experiments.

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    Probabilistic method to assess the impact of charging of electric vehicles on distribution grids  Open access

     Valsera-Naranjo, Eduardo; Sumper, Andreas; Villafafila Robles, Roberto; Martínez Vicente, David
    Energies
    Date of publication: 2012-05-18
    Journal article

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    This paper describes a grid impact analysis of charging electric vehicles (EV) using charging curves with detailed battery modelling. A probabilistic method using Monte Carlo was applied to a typical Spanish distribution grid, also using mobility patterns of Barcelona. To carry out this analysis, firstly, an IEEE test system was adapted to a typical distribution grid configuration; secondly, the EV and its battery types were modeled taking into account the current vehicle market and the battery characteristics; and, finally, the recharge control strategies were taken into account. Once these main features were established, a statistical probabilistic model for the household electrical demand and for the EV charging parameters was determined. Finally, with these probabilistic models, the Monte Carlo analysis was performed within the established scenario in order to study the lines’ and the transformers’ loading levels. The results show that an accurate model for the battery gives a more precise estimation about the impact on the grid. Additionally, mobility patterns have been proved to be some of the most important key aspects for these type of studies.

  • A review of energy storage technologies for wind power applications

     Díaz González, Francisco; Sumper, Andreas; Gomis Bellmunt, Oriol; Villafafila Robles, Roberto
    Renewable and sustainable energy reviews
    Date of publication: 2012-05
    Journal article

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  • Dynamic model of an HTS cable for power grid simulation

     Del-Rosario Calaf, Gerard; Sumper, Andreas; Granados García, Xavier; Sudria Andreu, Antoni; Villafafila Robles, Roberto
    Physics Procedia
    Date of publication: 2012
    Journal article

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  • Aportaciones al modelado de la generación fotovoltaica para la planificación de la red de distribución  Open access

     Ramon Marin, Miguel Angel
    Defense's date: 2012-11-08
    Department of Electrical Engineering, Universitat Politècnica de Catalunya
    Theses

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    In this thesis it have been explained the problems that the electric distribution companies in Spain have to plan and operate their power networks, having no detailed measurements of instant active power of a large number of non-programmable generators connected to them. The main objective is to reduce errors and difficulties that this lack of information generates. It has been analyzed the specific case of photovoltaic generators (PV), representing at the end of 2011, a 94.6 % of the special regime generators connected to the power networks in Spain, and have an average power of 72 kW per plant at the end of 2011. This means that are mainly connected to the distribution network, so we study the specific issues regarding the planning of the distribution network. It is defined that prediction models of solar irradiance are divided into parametric and decomposition. The ASHRAE parametric model prediction of solar irradiance is described, checking that its instant error levels are not negligible when compared with real data, since it does not include components that provide greater instant solar irradiance variability, such as atmospheric phenomena. It has been described a model based on the usability for the prediction of instantaneous power of PV generation, which is based on an hourly rate of sunlight (Kt) to transfer the extraterrestrial solar irradiation to a horizontal surface on Earth ¿s surface. It has been seen that the definition of the statistical function that defines Kt, makes the difference between the different models based on usability. It has been developed a proposed solution, which allows the development of models using predictors measured at the Earth¿s s urface, which incorporate the variability of atmos pheric phenomena. It has been evaluated the available data for the distribution companies, as well as specified the conditions necessary to develop specific models to be applied in distribution network planning. The proposed solution consists in a systematic methodology for developing models, based on historical data, which provides a response to a wide range of applications for distribution network analysis. It has been shown that the geographic scope of validity of the developed models exceeds the average needs for distribution network planning. It have been developed three case studies, where application of the methodology has been developed, based on real data of a distribution network in the province of Lleida, Spain. Also, it has been found that the models needed for photovoltaic plants with solar follower are different from those needed for photovoltaic plants without follower, because they need to be developed from different predictors. Contributions have been developed based on examples of application of the developed models to network analysis, based on another set of real data from the distribution network in Lleida, corresponding to a medium voltage line (25 kV). Based on this example it have been described the possible options when applying the methodology, as well as several different situations, drawing conclusions. Furthermore, it have been evaluated the possible seasonality of the models, and therefore, the contribution that would get from the development of specific models for each quarter, against the development of a single model for the prediction of the whole year. Barcelon

    Mediante la presente tesis se ha planteado la problemática existente en las empresas de distribución en España, que han de planificar y operar sus redes eléctricas sin disponer de medidas de potencia activa instantánea de un alto número de generadores fotovoltaicos conectados a las mismas, con el objetivo principal de reducir los posibles errores y dificultades que dicha falta de información genera. Se ha estudiado el caso concreto de los generadores fotovoltaicos, que representan al cierre del año 2011 el 94,6% de los generadores en régimen especial conectados en las redes eléctricas en España, y que al contar con una potencia media por instalación de 72 kW al cierre del año 2011, están mayoritariamente conectados a la red de distribución, por lo que se estudian las problemáticas especificas en cuanto a la planificación de dicha red. Con el fin de predecir la producción fotovoltaica de una forma indirecta, ya que no se dispone de la totalidad de los datos necesarios directamente, se precisan modelos basados en los predictores disponibles, como la irradiancia solar. Se ha definido que los modelos de predicción de la irradiancia solar se dividen en paramétricos y de descomposición. Se ha descrito el modelo paramétrico ASHRAE de predicción de la irradiancia solar, comprobando que obtiene unos niveles de error que no son despreciables al compararlos con datos reales, dado que no incorpora los componentes que aportan mayor variabilidad a dicha irradiancia solar instantánea, como son los fenómenos atmosféricos. Se ha descrito un modelo de descomposición basado en la utilizabilidad, para la predicción de la potencia instantánea de generación de una planta fotovoltaica, que se basa en un índice horario de claridad solar (Kt) para trasladar la irradiación solar extraterrestre a una superficie horizontal en la superficie terrestre. Se ha podido ver que es la definición de la función estadística que define a Kt, lo que marca la diferencia entre los diferentes modelos basados en la utilizabilidad. Por tanto, los modelos existentes o bien no consideran los fenómenos que tienen lugar en la superficie terrestre, o bien los consideran de forma estadística para largos períodos. Se ha desarrollado una propuesta de solución que permite el desarrollo de modelos utilizando predictores medidos en la superficie terrestre, los cuales incorporan la variabilidad de los fenómenos atmosféricos. Se incorpora en la elaboración de dicha solución la evaluación de los datos disponibles en el entorno de las compañías distribuidoras, así como la especificación de los condicionantes necesarios en el modelado especifico a desarrollar para su utilización en la planificación de la red de distribución. La propuesta de solución consiste en una metodología sistemática de desarrollo de modelos, a partir del tratamiento estadístico de datos reales históricos, que permite dar una respuesta a una amplia gama de aplicaciones de análisis de la red de distribución. Se ha demostrado que el ámbito geográfico de validez de los modelos supera ampliamente las necesidades medias específicas para su utilización en la planificación de la red de distribución. Se han desarrollado ejemplos reales de aplicación de la metodología desarrollada, basados en datos reales de la red de distribución en la provincia de Lleida, en España. Con ellos se ha podido comprobar que los modelos necesarios para plantas fotovoltaicas con seguidor son diferentes de los necesarios para plantas fotovoltaicas sin seguidor, pues necesitan desarrollarse a partir de predictores diferentes. Se han desarrollado aportaciones en base a ejemplos de aplicación de los modelos desarrollados al análisis de red, basados en otra serie de datos reales de la red de distribución en Lleida, correspondientes a una línea de distribución en media tensión (25 kV). En base a dicho ejemplo se han descrito las posibles opciones a la hora de la aplicación de la metodología, así como se han analizado diversas casuísticas que se pueden presentar, extrayendo conclusiones. Así mismo, se ha evaluado la posible estacionalidad de los modelos, y por tanto, la aportación que conllevaría el desarrollo de modelos específicos para cada trimestre del año, frente al desarrollo de un único modelo para la predicción de todo el año. También se han presentado ejemplos de aplicación de los modelos a la resolución de un caso mediante un flujo de cargas.

  • Promotion of renewable energy in Latin America for the security of electric supply

     Aquino Robles, Jose A.; Villafafila Robles, Roberto; Sumper, Andreas; Ramirez Pisco, Rodrigo
    International Conference on Electrical Power Quality and Utilisation
    Presentation's date: 2011-10-17
    Presentation of work at congresses

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  • Probabilistic analysis in normal operation of distribution system with distributed generation

     Villafafila Robles, Roberto; Sumper, Andreas; Bak-Jensen, Birgitte; Valsera Naranjo, Eduardo
    IEEE Power & Energy Society General Meeting
    Presentation's date: 2011-07
    Presentation of work at congresses

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  • Deterministic and probabilistic assessment of the impact of the electrical vehicles on the power grid

     Valsera Naranjo, Eduardo; Martinez Vicente, David; Sumper, Andreas; Villafafila Robles, Roberto; Sudria Andreu, Antoni
    IEEE Power & Energy Society General Meeting
    Presentation's date: 2011-07
    Presentation of work at congresses

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  • Protection system remote laboratory

     Martinez Perez, Raul; Villafafila Robles, Roberto; Lloret Gallego, Pau; Egea Alvarez, Agustí; Sumper, Andreas; Silos Sanchez, Angel
    Electrical Power Quality and Utilisation
    Presentation's date: 2011-10-17
    Presentation of work at congresses

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  • Assessment of the impact of existing high voltage lines in urban areas

     Sumper, Andreas; Villafafila Robles, Roberto; Boix Aragonès, Oriol; Bergas Jane, Joan Gabriel; Sudria Andreu, Antoni
    International Conference on Modern Power Systems
    Presentation's date: 2011-05-18
    Presentation of work at congresses

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  • Electric vehicles in power systems with distributed generation: Vehicle to Microgrid (V2M) project

     Villafafila Robles, Roberto; Lloret Gallego, Pau; Heredero Peris, Daniel; Sumper, Andreas; Cairó, Ignasi; Cruz Zambrano, Miguel; Vidal, Narcis
    International Conference on Electrical Power Quality and Utilisation
    Presentation's date: 2011-10-17
    Presentation of work at congresses

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  • Reactive power dispatch in wind power plants using heuristic optimization techniques

     Martinez Rojas, Marcela
    Defense's date: 2011-05-04
    Department of Electrical Engineering, Universitat Politècnica de Catalunya
    Theses

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  • Intelligent Monitoring and Diagnosis of Power Transformers in the Context of an Asset Management Model

     Velásquez Contreras, Juan Lorenzo
    Defense's date: 2011-09-12
    Department of Electrical Engineering, Universitat Politècnica de Catalunya
    Theses

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  • Electrificación rural con energía eólica y solar

     García Villoria, Alberto; Pastor Moreno, Rafael; Coves Moreno, Anna Maria; Santos Lopez, M. Antonia de Los; Villafafila Robles, Roberto; Ferrer Marti, Laia
    Participation in a competitive project

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  • Controllable and Intelligent Power Components

     Montesinos Miracle, Daniel; Galceran Arellano, Samuel; Villafafila Robles, Roberto; Sudria Andreu, Antoni
    Participation in a competitive project

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  • European Smart Electric Grid and Electric Storage

     Gomis Bellmunt, Oriol; Villafafila Robles, Roberto; Galceran Arellano, Samuel; Sudria Andreu, Antoni
    Participation in a competitive project

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  • Business & service models to support the roll-out of electric vehicles in cities

     Villafafila Robles, Roberto; Galceran Arellano, Samuel; Sumper, Andreas; Bergas Jane, Joan Gabriel; Sudria Andreu, Antoni
    Participation in a competitive project

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  • Life-cycle assessment of a photovoltaic system in Catalonia (Spain)

     Sumper, Andreas; Robledo García, Mercedes; Villafafila Robles, Roberto; Bergas Jane, Joan Gabriel; Andrés-Peiró, Juan
    Renewable and sustainable energy reviews
    Date of publication: 2011-10
    Journal article

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  • Short-term voltage stability of fixed-speed wind turbines: Comparison of single and double cage Induction Generators

     Sumper, Andreas; Gomis Bellmunt, Oriol; Sudria Andreu, Antoni; Villafafila Robles, Roberto; Rull Duran, Joan
    IEEE Power & Energy Society General Meeting
    Presentation's date: 2010
    Presentation of work at congresses

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  • Modeling wind turbine generation systems for load flow and short circuit

     Correira, Gonçalo; Sumper, Andreas; Castro, Rui; Villafafila Robles, Roberto; Sudria Andreu, Antoni
    International Conference on Modern Power Systems
    Presentation's date: 2010-05
    Presentation of work at congresses

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    Performance of fixed speed wind turbines under system frequency deviations  Open access

     Sumper, Andreas; Gomis Bellmunt, Oriol; Sudria Andreu, Antoni; Villafafila Robles, Roberto; Rull Duran, Joan
    European Wind Energy Conference and Exhibition
    Presentation's date: 2010-04-20
    Presentation of work at congresses

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    This paper studies the impact of system frequency deviations on the operation of fixed speed induction generators used in wind turbine generation systems(WTGS). It presents an analytic method to predict the angular speed, torque and current during and after a frequency disturbance. The proposed method can be used to evaluate the operation limits of the WTGS during frequency deviations.

  • Conditioning Data for Condition Assessment of Power Transformer

     Villafafila Robles, Roberto; Rodríguez, Marta; Lloret Gallego, Pau; Sumper, Andreas; Galceran Arellano, Samuel
    Advanced Research Workshop on transformers
    Presentation's date: 2010-10-05
    Presentation of work at congresses

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  • Reducing uncertainties caused by distributed generation in medium voltage network planning

     Ramón Marín, Miquel; Sumper, Andreas; Villafafila Robles, Roberto; Ferrer, Julià; Albet, Victor
    Sustainable Distribution Asset Management & Financing
    Presentation's date: 2010-06
    Presentation of work at congresses

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    Deterministic and Probabilistic Assessment of the Impact of the Electrical Vehicles on the Power Grid  Open access

     Valsera Naranjo, Eduardo; Sumper, Andreas; Lloret Gallego, Pau; Villafafila Robles, Roberto; Sudria Andreu, Antoni
    International Conference on Renewable Energies and Power Quality
    Presentation's date: 2010-03-23
    Presentation of work at congresses

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    This paper analyzes the impact of the charge of EVs(Electrical Vehicles) on a power grid. In order to simulate the behavior of the EV charging on the grid a model of its battery has been found (EV’s charging curve). As the way of the EV is charged from the grid affects critically to the voltage levels and to the saturation of the lines two modalities of charge are presented: not-controlled charge and controlled charge. Finally,the simulations have been performed from two points of view:deterministic analysis and probabilistic analysis.

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    Software Tool for the Analysis of Electromagnetic Disturbances Propagation  Open access

     Chindris, Mircea; Cziker, Andrei; Sumper, Andreas; Miron, Anca; Sudria Andreu, Antoni; Villafafila Robles, Roberto
    International Conference on Renewable Energies and Power Quality
    Presentation's date: 2010-03-23
    Presentation of work at congresses

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    The analysis of the conducted electromagnetic disturbances propagation is a complex issue, involving detection and analysis of electromagnetic disturbances, modelling of power grids’ elements, and study of the influenceon the grids’ elements (electric lines and power transformers)of the existing disturbances.

  • Methodology for the assessment of the impact of existing high voltage lines in urban areas

     Sumper, Andreas; Boix Aragonès, Oriol; Villafafila Robles, Roberto; Bergas Jane, Joan Gabriel; Ramirez Pisco, Rodrigo
    Energy policy
    Date of publication: 2010-10
    Journal article

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  • Baterías tradicionales y avanzadas

     Villafafila Robles, Roberto; Galceran Arellano, Samuel; Valsera Naranjo, Eduardo
    Automática e instrumentación
    Date of publication: 2010-09
    Journal article

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  • Monitoramento total em subestaçoes de energia eléctrica

     Farrero, Jordi; Nicolau, Guillermo; Villafafila Robles, Roberto; Velásquez, Juan Lorenzo; Galceran Arellano, Samuel; Sudria Andreu, Antoni; Lloret Gallego, Pau; Sumper, Andreas
    Eletricidade Moderna Magazine
    Date of publication: 2010-09
    Journal article

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  • Sistemas fotovoltaicos conectados a la red eléctrica

     Villafafila Robles, Roberto; Rull Duran, Joan; Galceran Arellano, Samuel; Montesinos Miracle, Daniel; Gross, Gabriel
    Automática e instrumentación
    Date of publication: 2010-04
    Journal article

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  • Access to the full text
    Electromechanical modelling and control of a micro-wind generation system for isolated low power DC micro grids  Open access

     Colet Subirachs, Alba; Gomis Bellmunt, Oriol; Clos Costa, Daniel; Martin Segura, Guillermo; Junyent Ferré, Adrià; Villafafila Robles, Roberto; Ferrer Marti, Laia
    EPE journal
    Date of publication: 2010-06-01
    Journal article

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    This paper describes the modelling and control of a micro-wind generation system, based on an axial flux permanent magnet synchronous generator (PMSG), for isolated low power DC micro grids. The system consists of a micro-wind turbine including a furling tail, a PMSG, a three phase diode rectifier and a buck converter connected to a battery bank and a load. Furthermore, it incorporates a control system to extract the maximum power output from the wind turbine using the minimum possible number of sensors. The system is simulated in Matlab/Simulink to analyze the dynamical response and it is compared with the current IT-PE-100.

  • Response of Fixed Speed Wind Turbines to System Frequency Disturbances

     Sumper, Andreas; Gomis Bellmunt, Oriol; Sudria Andreu, Antoni; Villafafila Robles, Roberto; Rull Duran, Joan
    IEEE transactions on power systems
    Date of publication: 2009-02
    Journal article

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  • Electrical vehicles: State of art and issues for their connection to the network

     Valsera Naranjo, Eduardo; Sumper, Andreas; Lloret Gallego, Pau; Villafafila Robles, Roberto; Sudria Andreu, Antoni
    10th International Conference on Electrical Power Quality and Uilisation
    Presentation's date: 2009-09-17
    Presentation of work at congresses

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  • Remote laboratory monitoring of rectifiers and harmonic current generation

     Sumper, Andreas; Villafafila Robles, Roberto; Gomis Bellmunt, Oriol; Ramirez Pisco, Rodrigo; Perez Jimenez, Raul
    European Conference on Power Electronics and Applications
    Presentation's date: 2009-09-08
    Presentation of work at congresses

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  • Embotellando energía: el sueño de los eléctricos

     Mascarell, Eduardo; Villafafila Robles, Roberto
    Automática e instrumentación
    Date of publication: 2009-05
    Journal article

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  • El uso eficiente de energía y la electrónica de potencia

     Ramirez Pisco, Rodrigo; Cruz, Miguel; Villafafila Robles, Roberto
    Automática e instrumentación
    Date of publication: 2009-01
    Journal article

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  • Sistemas de almacenamiento de energía eléctrica

     Berenguer, Josep Joan; Galceran Arellano, Samuel; Villafafila Robles, Roberto
    Automática e instrumentación
    Date of publication: 2009-03
    Journal article

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  • El volante de inercia: una alternativa a las baterías

     Berenguer, Josep Joan; Galceran Arellano, Samuel; Villafafila Robles, Roberto
    Automática e instrumentación
    Date of publication: 2009-03
    Journal article

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  • Probabilistic modelling in Normal Operation and the Control of Distribution Systems with Renewable Source based DG units

     Villafafila Robles, Roberto
    Defense's date: 2009-06-22
    Department of Electrical Engineering, Universidad Politècnica de Catalunya
    Theses

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