Ara es mostren els items 107-126 de 188

    • MECÀNICA I ELECTRICITAT EN LA INDÚSTRIA QUÍMICA (Examen 1r Quadr.) 

      Luna Alloza, Álvaro (Universitat Politècnica de Catalunya, 2006-11-03)
      Examen
      Accés restringit a la comunitat UPC
    • 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 ...
    • Modelling and simulation of bifacial pv production using monofacial electrical models 

      Bouchakour, Salim; Valencia Caballero, Daniel; Luna Alloza, Álvaro; Román Medina, Eduardo; Boudjelthia, El Amin Kouadri; Rodríguez, Pedro (2021-07-02)
      Article
      Accés obert
      In this paper, we investigate the use of monofacial PV models to simulate the production of bifacial PV systems over different albedos. Analytical and empirical models were evaluated using measured data obtained from three ...
    • Multi-resonant frequency-locked loop for grid synchronization of power converters under distorted grid conditions 

      Rodríguez Cortés, Pedro; Luna Alloza, Álvaro; Candela García, José Ignacio; Mujal-Rosas, Ramon Maria; Teodorescu, Remus; Blaabjerg, F. (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-01)
      Article
      Accés obert
      This paper presents a new multiresonant frequencyadaptive synchronization method for grid-connected power converters that allows estimating not only the positive- and negative-sequence components of the power signal at ...
    • Multi-terminal HVDC grids with inertia mimicry capability 

      Zhang, Weiyi; Rouzbehi, Kumars; Luna Alloza, Álvaro; Gharehpetian, Gevorg B.; Rodríguez Cortés, Pedro (2016-06-23)
      Article
      Accés obert
      The high-voltage multi-terminal dc (MTDC) systems are foreseen to experience an important development in the next years. Currently, they have appeared to be a prevailing technical and economical solution for harvesting ...
    • Multi-terminal MVDC grids fault location and isolation 

      Monadi, Mehdi; Koch-Ciobotaru, Cosmin; Luna Alloza, Álvaro; Candela García, José Ignacio; Rodríguez Cortés, Pedro (2016-06-28)
      Article
      Accés obert
      Voltage source converters (VSCs) are highly vulnerable to DC fault current; thus, protection is one of the most important concerns associated with the implementation of multi-terminal VSC-based DC networks. This paper ...
    • Multilevel-clamped multilevel converters (MLC2) – an alternative approach for multilevel power conversion 

      Rodríguez Cortés, Pedro; D. Bellar, maria; Muñoz Aguilar, Raúl Santiago; Rocabert Delgado, Joan; Luna Alloza, Álvaro (IEEE, 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper a new multilevel power conversion concept is proposed, whereby an additional auxiliary circuit composed of multilevel clamping cells is applied to a main DCAC converter. The resultant structure, the ...
    • Multiple second order generalized integrators for harmonic synchronization of power converters 

      Rodríguez Cortés, Pedro; Luna Alloza, Álvaro; Etxebarría, Ion; Hermoso Costa, Juan Ramón; Teodorescu, Remus (2009)
      Text en actes de congrés
      Accés obert
      This paper presents a new frequency-adaptive synchronization method for grid-connected power converters which allows estimating not only the positive- and negativesequence components of the power signal at the ...
    • Multiterminal DC grids: operating analogies to AC power systems 

      Rouzbehi, Kumars; Candela García, José Ignacio; Gharehpetian, Gevorg B.; Harnefors, Lennart; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (2016-12-06)
      Article
      Accés obert
      Nowadays, some Multi-terminal DC (MTDC) systems are in operation around the world. Soon, MTDC grids will be built and overlay the present AC grids. The main driver for the construction of such a grid is to facilitate ...
    • Optimized control of multi-terminal DC grids using particle swarm optimization 

      Rouzbehi, Kumars; Miranian, Arash; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (2015-10-29)
      Article
      Accés obert
      The electric networks of the future will make an extensive use of DC grids. Therefore, the control of Multi-terminal DC (MTDC) grids is a key issue, which is gathering the attention of the industry and the research community. ...
    • Optimized control of multi-terminal DC GridsUsing particle swarm optimization 

      Rouzbehi, Kumars; Miranian, Arash; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (2013)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This paper addresses the important issue of Multi-Terminal DC (MTDC) grid control strategy based on the particle swarm optimization (PSO) technique. The MTDC grid is controlled by the concept of vector control, in which ...
    • Overview of power processing structures for embedding energy storage in PV power converters 

      Citro, Costantino; Luna Alloza, Álvaro; Rocabert Delgado, Joan; Muñoz Aguilar, Raúl Santiago; Candela García, José Ignacio; Rodríguez Cortés, Pedro (IEEE Computer Society Publications, 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The level of penetration of grid-connected photovoltaic (PV) systems has grown very quickly in recent years. Nonetheless, network stresses related to the recurrent voltage and frequency oscillations caused by their irregular ...
    • Performance analysis of conventional PSS and fuzzy controller for damping power system oscillations 

      Banna, Hasan UI; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro; Cabrera Tobar, Ana; Ghorbani, Hamidreza; Ying, Shaoqing (2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Electro-mechanical oscillations are produced, in the machines of an interconnected power network, followed by a disturbance or due to high power transfer through weak tie lines. These oscillations should be damped as quickly ...
    • 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 ...
    • Photovoltaic plants generation improvement using Li-ion batteries as energy buffer 

      Beltran, H.; Swierczynski, M.; Luna Alloza, Álvaro; Vázquez Guzmán, Gerardo; Belenguer, E. (IEEE Industrial Electronics Society, 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper analyzes the PV power plants operability improvement obtained when introducing energy storage (ES) systems which allow decoupling the power received from the sun on the photovoltaic (PV) panels from the power ...
    • Posicast control: a novel approach to mitigate multi-machine power system oscillations in presence of wind farm 

      Ghorbani, Hamidreza; Candela García, José Ignacio; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper, application of Posicast control method to generator excitation system is presented. The method is one of the simplest possible control design methods that can be applied to damp the oscillations caused by ...
    • Power control of VSC HVDC converters for limiting the influence of ac unbalanced faults on multi-terminal DC grids 

      Suul, Jon Are; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (2010)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      It will be important for the operation of future multi-terminal HVDC systems that each converter unit is capable of limiting the influence of nearby AC faults on the DC grid. Thus, the local control systems at each terminal ...
    • Power station for large scale photovoltaic power plants 

      Verdugo Retamal, Cristian Andrés; Candela García, José Ignacio; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (2017)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Most of the large scale photovoltaic power plants (LS-PVPP) count on power converters with a central configuration. Advantages such as robustness, low maintenance and installation cost makes this configuration the preferred ...
    • PROCESSAMENT ELECTRÒNIC DE POTÈNCIA (Examen 1r quadrimestre, 2n parcial) 

      Luna Alloza, Álvaro; Rocabert Delgado, Joan (Universitat Politècnica de Catalunya, 2012-01-19)
      Examen
      Accés restringit a la comunitat UPC