Exploració per autor "Pedra Durán, Joaquim"Més informacióMés informació

Ara es mostren els items 21-38 de 38

    • 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 ...

    • Parameter estimation of squirrel-cage motors with parasitic torques in the torque–slip curve 

      Monjo Mur, Lluís; Córcoles López, Felipe; Pedra Durán, Joaquim (2015-04-16)
      Article
      Accés obert
      This paper studies parasitic torques in steady-state torque–slip curves of squirrel-cage induction motors. The curves of nine motors (small, medium and large size units), three of which were measured in the range s = 2 ...

    • Parameter estimation of wound-rotor induction motors from transient measurements 

      Kojooyan, Hengameh; Monjo Mur, Lluís; Córcoles López, Felipe; Pedra Durán, Joaquim (2014-06)
      Article
      Accés restringit per política de l'editorial
      A new method for determination of the steady-state equivalent circuit parameters of wound-rotor induction motors using experimental data from starting transient measurements is presented. The algorithm data are the stator ...

    • Quasi-z-source inverter-based photovoltaic power system modeling for grid stability studies 

      Monjo Mur, Lluís; Sainz Sapera, Luis; Mesas García, Juan José; Pedra Durán, Joaquim (2021-01-19)
      Article
      Accés obert
      Quasi-Z-source inverters (qZSIs) are becoming a powerful power conversion technology in photovoltaic (PV) power systems because they allow energy power conversion in a single stage operation. However, they can cause system ...

    • 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. ...

    • Review and improvements to the measurements of the VSC impedance transfer matrix 

      Pedra Durán, Joaquim; Sainz Sapera, Luis; Monjo Mur, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2024-04)
      Article
      Accés obert
      Impedance/admittance transfer matrix characterization of voltage source converters is an important issue in frequency domain stability studies. Several approaches in the dq- and pn-frame are proposed to obtain this matrix ...

    • Saturation effects on torque- and current–slip curves of squirrel-cage induction motors 

      Monjo Mur, Lluís; Córcoles López, Felipe; Pedra Durán, Joaquim (2012-12-24)
      Article
      Accés restringit per política de l'editorial
      This paper measures and analyzes the saturation effects on torque- and current–slip curves of three squirrel-cage induction motors.Motor saturation is illustrated by three sets of measurements: I) torque and current for ...

    • 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 ...

    • Squirrel-cage induction motor parameter estimation using a variable frequency test 

      Monjo Mur, Lluís; Kojooyan, Hengameh; Córcoles López, Felipe; Pedra Durán, Joaquim (2015-06-01)
      Article
      Accés obert
      This paper presents amethod for squirrel-cage induction motor parameter estimation using a phase-to-phase standstill variable frequency test. The measured resistance and reactance at different frequencies are the data of ...

    • State-space model of quasi-z-source inverter-PV systems for transient dynamics studies and network stability assessment 

      Monjo Mur, Lluís; Sainz Sapera, Luis; Mesas García, Juan José; Pedra Durán, Joaquim (2021-07-09)
      Article
      Accés obert
      Photovoltaic (PV) power systems are increasingly being used as renewable power generation sources. Quasi-Z-source inverters (qZSI) are a recent, high-potential technology that can be used to integrate PV power systems into ...

    • Study of cable short circuit in VSC DC systems 

      Monjo Mur, Lluís; Mesas García, Juan José; Sainz Sapera, Luis; Pedra Durán, Joaquim (2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial

    • Study of MVDC system benchmark networks 

      Mesas García, Juan José; Monjo Mur, Lluís; Sainz Sapera, Luis; Pedra Durán, Joaquim (2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial

    • Study of resonance in wind parks 

      Monjo Mur, Lluís; Sainz Sapera, Luis; Liang, Jun; Pedra Durán, Joaquim (2015-11-01)
      Article
      Accés obert
      Wind turbine harmonic current emissions are a well-known power quality problem. These emissions flow through wind park impedances, leading to grid voltage distortion. Parallel resonance may worsen the problem because it ...

    • Study of the steinmetz circuit influence on AC traction system resonance 

      Sainz Sapera, Luis; Monjo Mur, Lluís; Riera, Sara; Pedra Durán, Joaquim (2012-10-01)
      Article
      Accés restringit per política de l'editorial
      Traction systems are single-phase, nonlinear loads, which can unbalance and pollute supply voltages. To reduce voltage unbalance, reactances are usually connected in delta configuration with traction systems. This setup ...

    • Study of voltage sag impact on LED lamp consumed currents 

      Monjo Mur, Lluís; Mesas García, Juan José; Sainz Sapera, Luis; Pedra Durán, Joaquim (2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial

    • 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 ...

    • Three-port small signal admittance-based model of VSCs for studies of multi-Terminal HVDC hybrid AC/DC yransmission grids 

      Pedra Durán, Joaquim; Sainz Sapera, Luis; Monjo Mur, Lluís (2021-01-01)
      Article
      Accés obert
      Multi-terminal high voltage direct current (HVDC) systems, together with AC transmission systems and voltage source converters (VSCs), form hybrid AC/DC grids with complex dynamic and transient interactions. VSCs ...

    • Using the instantaneous power of a free acceleration test for squirrel-cage motor parameters estimation 

      Kojooyan, Hengameh; Monjo Mur, Lluís; Córcoles López, Felipe; Pedra Durán, Joaquim (2015-09-01)
      Article
      Accés obert
      A new parameters determination method for squirrel-cage induction motors is presented. As a main contribution, the method uses the instantaneous electrical power and the mechanical speed measured in a free acceleration ...