Now showing items 21-40 of 67

    • Converter structure-based power loss and static thermal modeling of the press-pack IGBT-based three-level ANPC and HB VSCs applied to Multi-MW wind turbines 

      Senturk, Osman S.; Helle, L; Munk-Nielsen, Stig; Rodríguez Cortés, Pedro; Teodorescu, Remus (2010)
      Conference report
      Open Access
      In this study, the converter-structure based power loss and thermal models are developed for the medium voltage full-scale 3LANPC- VSC and 3L-HB-VSC utilizing press-pack IGBT-diode pairs and interfacing a 6MW wind ...
    • Current control method for distributed generation power generation plants under grid fault conditions 

      Rodríguez Cortés, Pedro; Luna Alloza, Álvaro; Hermoso Costa, Juan Ramón; Etxeberria Otadui, Ion; Teodorescu, Remus; Blaabjerg, Frede (IEEE Computer Society Publications, 2011)
      Conference report
      Restricted access - publisher's policy
      The operation of distributed power generation systems under grid fault conditions is a key issue for the massive integration of renewable energy systems. Several studies have been conducted to improve the response of ...
    • DC-link voltage oscilations reduction during unbalanced grid faults for high power wind turbines 

      Miranda, Hernan; Teodorescu, Remus; Rodríguez Cortés, Pedro; Helle, L. (2011)
      Conference report
      Restricted access - publisher's policy
      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 ...
    • Decoupled double synchronous reference frame current controller for unbalanced grid voltage conditions 

      Reyes, Manuel; Rodríguez Cortés, Pedro; Vazques, Sergio; Luna Alloza, Álvaro; Carrasco, Juan Manuel; Teodorescu, Remus (2012)
      Conference report
      Restricted access - publisher's policy
      Due to the growing changes in the electrical network related to the new distributed generation scheme and the integration of renewable energy sources, new requirements for grid-connected power converters are being defined ...
    • Design and analysis of a slope voltage control for a DFIG wind power plant 

      Martinez, J.; Kjaer, P. C.; Rodríguez Cortés, Pedro; Teodorescu, Remus (2012-03)
      Article
      Restricted access - publisher's policy
      This paper addresses a detailed design of a wind power plant and turbine slope voltage control in the presence of communication delays for a wide short-circuit ratio range operation. The implemented voltage control ...
    • Design and coordination of a capacitor and on-load tap changer system for voltage control in a wind power plant of doubly fed induction generator wind turbines 

      Martinez, J.; Rodríguez Cortés, Pedro; Kjaer, P. C.; Teodorescu, Remus (2011-05-26)
      Article
      Restricted access - publisher's policy
      In this paper, a novel coordination and control strategy for capacitor banks and on-load tap changer for a wind power plant is introduced. The capacitor banks are controlled in such way that the steady-state usage of the ...
    • Deterministic and stochastic study of wind farm harmonic currents 

      Sainz Sapera, Luis; Mesas García, Juan José; Teodorescu, Remus; Rodríguez Cortés, Pedro (2010-06-03)
      Article
      Open Access
      Wind farm harmonic emissions are a well-known power quality problem, but little data based on actual wind farm measurements are available in literature. In this paper, harmonic emissions of an 18MWwind farm are investigated ...
    • 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)
      Conference report
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      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 ...
    • Enhanced control strategy for MMC-based STATCOM for unbalanced load compensation 

      Nieves, M.; Maza, J.M.; Mauricio, J.M.; Teodorescu, Remus; Bongiorno, M.; Rodríguez Cortés, Pedro (2014)
      Conference report
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      Modular Multilevel Converters (MMC) technology is today one of the preferred technology in HVDC and large STATCOM applications due to modularity, fault tolerance and high efficiency, but the voltage balancing becomes very ...
    • Enhanced decoupled double synchronous reference frame current controller for unbalanced grid-voltage conditions 

      Reyes, M.; Rodríguez Cortés, Pedro; Vazquez, S.; Luna Alloza, Álvaro; Teodorescu, Remus; Carrasco, J.M. (2012)
      Article
      Restricted access - publisher's policy
      In the last few years, restrictive grid codes have arisen to ensure the performance and stability of electrical networks, which experience amassive integration of renewable energy sources and distributed generation systems ...
    • Enhanced local grid voltage support method for high penetration of distributed generators 

      Demirok, Erhan; Sera, Dezso; Rodríguez Cortés, Pedro; Teodorescu, Remus (IEEE Computer Society Publications, 2011)
      Conference report
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      Grid voltage rise and thermal loading of network components are the most remarkable barriers to allow high number of distributed generator (DG) connections on the medium voltage (MV) and low voltage (LV) electricity ...
    • Evaluation of the voltage support strategies for the low voltage grid connected PV generators 

      Demirok, Erhan; Sera, Dezso; Teodorescu, Remus; Rodríguez Cortés, Pedro; Borup, U (2010)
      Conference report
      Open Access
      Admissible range of grid voltage is one of the strictest constraints for the penetration of distributed photovoltaic (PV) generators especially connection to low voltage (LV) public networks. Voltage limits are usually ...
    • FACTS Devices for large wind power plants 

      Adamczyk, A.; Teodorescu, Remus; Mukerjee, R. N.; Rodríguez Cortés, Pedro (2010)
      Conference report
      Restricted access - publisher's policy
      Growing number of wind turbines is changing electricity generation profile all over the world. However, high wind energy penetration affects power system safety and stability. For this reason transmission system operators ...
    • Four-branch star neutral current hybrid power filter and var compensator 

      Rodríguez Cortés, Pedro; Candela García, José Ignacio; Luna Alloza, Álvaro; Teodorescu, Remus; Blaabjerg, F.; Rocabert Delgado, Joan (2010)
      Conference report
      Open Access
      This paper presents a solution for filtering current harmonics in three-phase four-wire networks based on the usage of a four-branch star (FBS) filter topology. The specific layout of single-phase inductors and capacitors ...
    • Grid filter design for a multi-megawatt medium-voltage voltage source inverter 

      Rockhill, A.A.; Liserre, M.; Teodorescu, Remus; Rodríguez Cortés, Pedro (IEEE Press. Institute of Electrical and Electronics Engineers, 2010-10-14)
      Article
      Open Access
      This paper describes the design procedure and performance of an LCL grid filter for a medium-voltage neutral point clamped (NPC) converter to be adopted for a multimegawatt wind turbine. The unique filter design challenges ...
    • Grid synchronization for advanced power processing and FACTS in wind power systems 

      Luna Alloza, Álvaro; Rocabert Delgado, Joan; Vázquez Guzmán, Gerardo; Rodríguez Cortés, Pedro; Teodorescu, Remus; Córcoles López, Felipe (2010)
      Conference report
      Open Access
      The high penetration of wind power systems in the electrical network has introduced new issues in the stability and transient operation of the grid. By means of providing advanced functionalities to the existing power ...
    • Grid voltage synchronization for distributed generation systems under grid fault conditions 

      Luna Alloza, Álvaro; Rocabert Delgado, Joan; Candela García, José Ignacio; Hermoso Costa, Juan Ramón; Teodorescu, Remus; Blaabjerg, Frede; Rodríguez Cortés, Pedro (2015-07-01)
      Article
      Open Access
      The actual grid code requirements for the grid connection of distributed generation systems, mainly wind and photovoltaic (PV) systems, are becoming very demanding. The transmission system operators (TSOs) are especially ...
    • Guest Editorial 

      Teodorescu, Remus; Sauter, Thilo; Rodríguez Cortés, Pedro; Rodriguez, José; Palensky, Peter; Nasiri, Adel; Kupzog, Friederich; Liserre, M.; Balcells Sendra, Josep; Basso, Thomas; Bialasiewicz, Jan T.; Cecati, Carlo; Chakraborty, Sudipta; Guerrero Zapata, Josep Maria; Kazerani, Mehrdad (IEEE Press. Institute of Electrical and Electronics Engineers, 2011)
      Article
      Open Access
    • Lifetime investigations of a lithium iron phosphate (LFP) battery system connected to a wind turbine for forecast improvement and output power gradient reduction 

      Swierczynski, M.; Teodorescu, Remus; Rodríguez Cortés, Pedro (2011)
      Conference report
      Open Access
      Lithium Ion batteries and especially Lithium Iron Phosphate (LFP) batteries can be characterized by high power densities, relatively long life-time, no maintenance and a lot of research currently being done on increasing ...
    • Lithium ion batteries ageing analysis when used in a PV power plant 

      Beltran, H.; Swierczynski, M.; Aparicio, N.; Belenguer, E.; Teodorescu, Remus; Rodríguez Cortés, Pedro (2012)
      Conference report
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      This paper analyzes the integration of lithium ion (Li-ion) batteries into large scale grid-connected PV plants. It performs a systematic analysis on both the operation improvement obtained by a PV+ES power plant and the ...