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Ara es mostren els items 16-35 de 36

    • Estudio del efecto de los huecos de tensión en el generador de inducción doblemente alimentado 

      Rolán Blanco, Alejandro (Universitat Politècnica de Catalunya, 2012-02-17)
      Tesi
      Accés obert
      The aim of this doctoral thesis is to analyse the dynamic behaviour of the doubly-fed induction generator exposed to voltage sags. This electrical machine is mainly used in variable-speed wind turbines. Due to the noticeable ...

    • Fault diagnosis and prognosis of a brushless dc motor using a model-based approach 

      Blesa Izquierdo, Joaquim; Quevedo Casín, Joseba Jokin; Puig Cayuela, Vicenç; Nejjari Akhi-Elarab, Fatiha; Zaragoza, Raúl; Rolán Blanco, Alejandro (2020)
      Comunicació de congrés
      Accés obert
      This paper proposes a model-based fault diagnosis and prognosis approach applied to brushless DC motors (BLDC). The objective is an early detection of mechanical and electrical faults in BLDC motors operating under a variety ...

    • Initialization of DFIG wind turbines with a phasor-based approach 

      Rolán Blanco, Alejandro; Pedra Durán, Joaquim (2019-03)
      Article
      Accés obert
      The objective of this paper is to propose a simple approach to solve the steady state of a wind turbine (WT) equipped with a doubly-fed induction generator (DFIG) which can be used to initialize dynamic studies of the ...

    • Integration of cold ironing and renewable sources in the Barcelona smart port 

      Rolán Blanco, Alejandro; Manteca, Paola; Oktar, Rahime; Siano, Pierluigi (2019-11)
      Article
      Accés obert
      Cold ironing, which is the procedure of supplying shoreside electrical power to a ship at berth when its engines are turned off, arises as the eco-friendly way to deliver power to ships while they are berthed in ports, ...

    • Integration of Distributed Energy Resources to Unbalanced Grids under Voltage Sags with Grid Code Compliance 

      Rolán Blanco, Alejandro; Bogarra Rodríguez, Santiago; Bakkar, Mostafa (2022-01-01)
      Article
      Accés obert
      The aim of this paper is to analyze the situations in which distributed power generation systems (DPGSs) based on renewable energy sources (RESs) can be controlled when operating under voltage sags. Analytical models for ...

    • Losses and CMV evaluation in transformerless grid-connected PV topologies 

      Vázquez Guzmán, Gerardo; Kerekes, Tamas; Rolán Blanco, Alejandro; Aguilar Gaván, Daniel; Luna Alloza, Álvaro; Acevedo, Gustavo (2009)
      Comunicació de congrés
      Accés obert
      Controlling the thermal losses in the semiconductors ~s well. as the Co~mon Mode Voltage (CMV), are important Issues In the design of power electronics converters for photovoltaic applications. At present time there are ...

    • Modeling and control of a three-phase grid-connected inverter under fault conditions 

      Rolán Blanco, Alejandro; Giménez, Pablo; Yague, Sauro J.; Bogarra Rodríguez, Santiago (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The aim of this paper is to study the behavior of a three-phase inverter with an RL filter powered by a renewable energy source and connected to a grid under fault conditions. The novelty of the work lies in proposing a ...

    • Modeling and simulation of synchronous machine and its behaviour against voltage sags 

      Aguilar Gaván, Daniel; Luna Alloza, Álvaro; Rolán Blanco, Alejandro; Vázquez Guzmán, Gerardo; Acevedo, Gustavo (2009)
      Comunicació de congrés
      Accés obert
      This paper studies the effects of voltage sags (dips), both symmetrical and unsymmetrical, on the three-phase Synchronous Machine (SM). The vast majority of the electrical power generation systems in the world is consist ...

    • Modeling of a variable speed wind turbine with a permanent magnet synchronous generator 

      Rolán Blanco, Alejandro; Luna Alloza, Álvaro; Vázquez Guzmán, Gerardo; Aguilar Gaván, Daniel; Acevedo, Gustavo (2009)
      Comunicació de congrés
      Accés obert
      The aim of this work is to analyze a typical configuration of a Wind Turbine Generator System (WTGS) equipped with a Variable Speed Generator. Nowadays, doublyfed induction generators are being widely used on WTGS, although ...

    • New smart sensor for voltage unbalance measurements in electrical power systems 

      Bogarra Rodríguez, Santiago; Saura Perisé, Jaime; Rolán Blanco, Alejandro (Multidisciplinary Digital Publishing Institute (MDPI), 2022-10-27)
      Article
      Accés obert
      This paper deals with voltage unbalances and how they can be quantified according to the standards. Firstly, a comparison between the different unbalance voltage factors is conducted in order to remark on their divergences. ...

    • On fixed-speed WT generator modeling for rotor speed stability studies 

      Pedra Durán, Joaquim; Córcoles López, Felipe; Monjo Mur, Lluís; Bogarra Rodríguez, Santiago; Rolán Blanco, Alejandro (2012-02)
      Article
      Accés restringit per política de l'editorial
      This paper analyzes fixed-speed induction generator modeling oriented to rotor speed stability studies. The single- and double-cage models are compared. The effects of symmetrical voltage sags on generator behavior are ...

    • Photovoltaic inverters with fault ride-through capability 

      Azevedo, Gustavo M.S.; Vázquez, Gerardo; Luna Alloza, Álvaro; Aguilar Galván, Daniel; Rolán Blanco, Alejandro (ISIE, 2009)
      Comunicació de congrés
      Accés obert
      This paper presents a new control strategy that allow the photovoltaic system operate under grid faults without overpass the rated current and assuring sinusoidal currents. In the classic control strategies used in ...

    • Reduced-order models of squirrel-cage induction generators for fixed-speed wind turbines under unbalanced grid conditions 

      Rolán Blanco, Alejandro; Córcoles López, Felipe; Bogarra Rodríguez, Santiago; Monjo Mur, Lluís; Pedra Durán, Joaquim (2016-06)
      Article
      Accés obert
      This paper develops a study of reduced-order models for squirrel-cage induction generators used in the fixed-speed wind turbines. The squirrel-cage of these generators must be modeled with a double-cage for accuracy purposes. ...

    • Simulation of wound rotor synchronous machine under voltage sags 

      Aguilar Galván, Daniel; Vázquez Guzmán, Gerardo; Rolán Blanco, Alejandro; Rocabert Delgado, Joan; Córcoles López, Felipe; Rodríguez Cortés, Pedro (IEEE Press. Institute of Electrical and Electronics Engineers, 2010)
      Comunicació de congrés
      Accés obert
      This paper presents a study of the Wound Rotor Synchronous Machine (SM) stability under voltage sags (dips). Machine behavior has been analyzed by considering different magnitudes (or depths) and duration of the sag. ...

    • Small synchronous machine protection during voltage sags caused by MV grid faults 

      Bogarra Rodríguez, Santiago; Rubion, X.; Rolán Blanco, Alejandro; Córcoles López, Felipe; Pedra Durán, Joaquim; Iglesias, J. (2018-03-01)
      Article
      Accés obert
      This paper analyses the impact of symmetrical and unsymmetrical voltage sags caused by distribution and transmission faults on the dynamic behaviour of small salient-pole synchronous machines connected to the MV grid, and ...

    • Symmetrical and unsymmetrical voltage sag effects on the three-phase synchronous machine stability 

      Aguilar Galván, Daniel; Rolán Blanco, Alejandro; Vázquez, Gerardo; Córcoles López, Felipe; Rodríguez Cortés, Pedro (2009)
      Comunicació de congrés
      Accés obert
      This paper focuses on the effects of voltage sags, both symmetrical and unsymmetrical, on the three-phase Synchronous Machine (SM). Voltage sags on SM cause speed variations, current and torque peaks and hence may cause ...

    • TEORIA DE CIRCUITS (1a avaluació) 

      Rolán Blanco, Alejandro (Universitat Politècnica de Catalunya, 2009-10-29)
      Examen
      Accés restringit a la comunitat UPC

    • TEORIA DE CIRCUITS (Prova final) 

      Rolán Blanco, Alejandro (Universitat Politècnica de Catalunya, 2010-01-13)
      Examen
      Accés restringit a la comunitat UPC

    • Testing of three-phase equipment under voltage sags 

      Rolán Blanco, Alejandro; Córcoles López, Felipe; Pedra Durán, Joaquim; Monjo Mur, Lluís; Bogarra Rodríguez, Santiago (2015-04-09)
      Article
      Accés obert
      This paper provides insight into the testing of three-phase equipment exposed to voltage sags caused by faults. The voltage sag recovers at the fault-current zeros, leading to a ‘discrete’ voltage recovery, that is, the ...

    • Voltage recovery influence on three-phase grid-connected inverters under voltage sags 

      Rolán Blanco, Alejandro; Giménez, Pablo; Yague, Sauro J.; Bogarra Rodríguez, Santiago; Saura Perisé, Jaime; Bakkar, Mostafa (2019-02-12)
      Article
      Accés obert
      Faults in power systems cause voltage sags, which, in turn, provoke large current peaks in grid-connected equipment. Then, a complete knowledge of the inverter behaviour is needed to meet fault ride-through capability. The ...