Browsing by Author "Rolán Blanco, Alejandro"Més informacióMés informació

Now showing items 21-36 of 36

    • 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)
      Conference lecture
      Open Access
      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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference lecture
      Open Access
      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)
      Conference lecture
      Open Access
      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
      Open Access
      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
      Restricted access - publisher's policy
      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)
      Conference lecture
      Open Access
      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
      Open Access
      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)
      Conference lecture
      Open Access
      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
      Open Access
      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)
      Conference lecture
      Open Access
      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)
      Exam
      Restricted access to the UPC academic community

    • TEORIA DE CIRCUITS (Prova final) 

      Rolán Blanco, Alejandro (Universitat Politècnica de Catalunya, 2010-01-13)
      Exam
      Restricted access to the UPC academic community

    • 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
      Open Access
      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
      Open Access
      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 ...

    • Voltage sag influence on controlled three-phase grid-connected inverters according to the Spanish grid code 

      Bakkar, Mostafa; Bogarra Rodríguez, Santiago; Rolán Blanco, Alejandro; Córcoles López, Felipe; Saura Perisé, Jaime (2020-02-03)
      Article
      Open Access
      To ensure the safe operation of the grid, there are some requirements to be taken into consideration to connect power converters. During abnormal conditions – e.g. during voltage sags –, the control of the converters is a ...