Exploració per autor "Helle, L."

Ara es mostren els items 1-4 de 4

    • DC-link voltage oscilations reduction during unbalanced grid faults for high power wind turbines 

      Miranda, Hernan; Teodorescu, Remus; Rodríguez Cortés, Pedro; Helle, L. (2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      During unbalanced grid voltage faults the Power injected to the grid experiences 100Hz oscillations as a result of interactions between positive and negative sequence components of three-phase voltages and currents. These ...

    • Electro-thermal modeling for junction temperature cycling-based lifetime prediction of a press-pack IGBT 3L-NPC-VSC applied to large wind turbines 

      Senturk, Osman S.; Munk-Nielsen, Stig; Teodorescu, Remus; Helle, L.; Rodríguez Cortés, Pedro (IEEE, 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Reliability is a critical criterion for multi-MW wind turbines, which are being employed with increasing numbers in wind power plants, since they operate under harsh conditions and have high maintenance cost due to their ...

    • Overview of recent grid codes for wind power integration 

      Altin, M.; Goksu, O.; Teodorescu, Remus; Rodríguez Cortés, Pedro; Bak-Jensen, Birgitte; Helle, L. (2010)
      Text en actes de congrés
      Accés obert
      As wind power penetration level increases, power system operators are challenged by the penetration impacts to maintain reliability and stability of power system. Therefore, grid codes are being published and continuously ...

    • Power density investigation on the press-pack IGBT 3L-HB-VSCs applied to large wind turbines 

      Senturk, Osman S.; Munk-Nielsen, Stig; Teodorescu, Remus; Helle, L.; Rodríguez Cortés, Pedro (IEEE, 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      With three different DC-side and AC-side connections, the three-level H-bridge voltage source converters (3L-HB-VSCs) are alternatives to 3L neutral-point-clamped VSCs (3L-NPC-VSCs) for interfacing large wind turbines ...