Now showing items 21-40 of 127

  • A protection strategy for fault detection and location for multi-terminal MVDC distribution systems with renewable energy systems 

    Monadi, Mehdi; Koch-Ciobotaru, Cosmin; Luna Alloza, Álvaro; Candela García, José Ignacio; Rodríguez Cortés, Pedro (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
    Restricted access - publisher's policy
    A fault location method and a fault clearance strategy are presented in this paper for medium voltage dc (MVDC) distribution system. MVDC systems are applicable for connection between microgrids (MGs) and integration of ...
  • A simplified model for wind turbine based on doubly fed induction generator 

    Lima, F. K. A.; Watanabe, Edson H.; Rodríguez Cortés, Pedro; Luna Alloza, Álvaro (2011)
    Conference report
    Restricted access - publisher's policy
    Improving the Fault Ride Through capability (FRT) of Doubly Fed Induction Generators (DFIG) in wind power applications is a very important challenge for wind power industry. The mathematical models of such generators ...
  • A simulation study of proportional resonant controller based on the implementation of frequency-adaptive virtual flux estimation with the LCL filter 

    Roslan, Nurul Fazlin; Suul, Jon Are; Luna Alloza, Álvaro; Candela García, José Ignacio; Rodríguez Cortés, Pedro (2015)
    Conference report
    Open Access
    This paper discusses the implementation of proportional resonant (PR) current controllers for a Voltage Source Converter (VSC) with LCL filter which is synchronized to the grid by virtual flux (VF) estimation with inherent ...
  • A stationary reference frame grid synchronization system for three-phase grid-connected power converters under adverse grid conditions 

    Rodríguez Cortés, Pedro; Luna Alloza, Álvaro; Muñoz Aguilar, Raúl Santiago; Etxebarría, Ion; Teodorescu, Remus; Blaabjerg, Frede (2012-01)
    Article
    Restricted access - publisher's policy
    Grid synchronization algorithms are of great importance in the control of grid-connected power converters, as fast and accurate detection of the grid voltage parameters is crucial in order to implement stable control ...
  • A unified power flow controller using a power electronics integrated transformer 

    Atef Elsaharty, Mohammed; Luna Alloza, Álvaro; Candela García, José Ignacio; Rodríguez Cortés, Pedro (Institute of Electrical and Electronics Engineers (IEEE), 2019-02-05)
    Article
    Restricted access - publisher's policy
    This paper presents a Unified Power Flow Controller (UPFC) application of the Custom Power Active Transformer (CPAT); a power electronics integrated transformer which provides services to ...
  • Autonomous inertia-sharing control of multi-terminal VSC-HVDC grids 

    Zhang, Weiyi; Rouzbehi, Kumars; Candela García, José Ignacio; Luna Alloza, Álvaro; Gharehpetian, Gevorg B.; Rodríguez Cortés, Pedro (2016)
    Conference report
    Restricted access - publisher's policy
    Multi-terminal high-voltage dc (HVDC) grids are expected to experience a continuous expansion in the near future, and have appeared as competitive strategies in transmitting offshore wind and interconnecting multiple ac ...
  • Centralized protection strategy for medium voltage DC microgrids 

    Monadi, Mehdi; Gavriluta, Catalin; Luna Alloza, Álvaro; Candela García, José Ignacio; Rodríguez Cortés, Pedro (2016-08-15)
    Article
    Open Access
    This paper presents a centralized protection strategy for medium voltage dc (MVDC) microgrids. The proposed strategy consists of a communication-assisted fault detection method with a centralized protection coordinator and ...
  • Comparative efficiency study of single phase photovoltaic grid connected inverters using PLECS® 

    Rouzbehi, Kumars; Davarifar, M.; Martino, M.; Citro, Costantino; Luna Alloza, Álvaro; Daneshifar, Z.; Rodríguez Cortés, Pedro (Institute of Electrical and Electronics Engineers (IEEE), 2015)
    Conference report
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    Global warming is already having significant and costly effects on our communities, our health, and our climate. Nowadays, In developing countries (G20) around the world, decisions are being considered and a shifting ...
  • Comparison of different power loop controllers for synchronous power controlled grid-interactive converters 

    Zhang, Weiyi; Remón, D.; Mir Cantarellas, Antonio; Luna Alloza, Álvaro; Rocabert Delgado, Joan; Candela García, José Ignacio; Rodríguez Cortés, Pedro (Institute of Electrical and Electronics Engineers (IEEE), 2015)
    Conference report
    Restricted access - publisher's policy
    The impact caused by the large scale penetration of renewable energy sources into electrical grid has been given an increasing concern in the past decade. Multiple challenges will occur in the future when the share of the ...
  • Comprehensive analogy between conventional AC grids and DC grids characteristics 

    Rouzbehi, Kumars; Gavriluta, Catalin; Candela García, José Ignacio; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (2013)
    Conference lecture
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    The high penetration of renewable energy resources, such as wind and photovoltaic, as well as the development of power electronics devices play an important role in the development of DC grids. However, the evolution of ...
  • Connection and disconnection transients for micro-grids under unbalance load condition 

    Rocabert Delgado, Joan; Azevedo, Gustavo M.S.; Candela García, José Ignacio; Luna Alloza, Álvaro; Blaabjerg, Frede; Rodríguez Cortés, Pedro (2014-03)
    Article
    Restricted access - publisher's policy
    In this paper the design and the implementation of a method oriented to carry out a safe and a stable intentional disconnection, and re-connection, of local micro-grids from the main distribution network under generic grid ...
  • Control of DFIG-WT under unbalanced grid voltage conditions 

    Luna Alloza, Álvaro; Rodríguez Cortés, Pedro; Lima, Kleber; Córcoles López, Felipe; Watanabe, Edson H.; Teodorescu, R. (2009)
    Conference lecture
    Open Access
    The voltage oriented control in the synchronous reference frame (VOC-SRF) have been extensively used for controlling wind turbines based on doubly fed induction generators (DFIG-WTs) through the rotor side converter of ...
  • Control of D-STATCOM during unbalanced grid faults based on DC voltage oscillations and peak current limitations 

    Khoshooei, Arash; Moghani, Javad S.; Milimonfared, Jafar; Luna Alloza, Álvaro; Candela García, José Ignacio; Rodríguez Cortés, Pedro (2016)
    Conference report
    Open Access
    The safe operation of grid connected power converters during abnormal condition is a key issue in order to guarantee its operation and to avoid undesired trips. In this paper different control methods for the operation of ...
  • Control of grid-connected power converters based on a virtual admittance control loop 

    Rodríguez Cortés, Pedro; Candela García, José Ignacio; Citro, Costantino; Rocabert Delgado, Joan; Luna Alloza, Álvaro (2013)
    Conference report
    Restricted access - publisher's policy
    The connection of electronic power converters to the electrical network is increasing mainly due to massive integration of renewable energy systems. However, the electrical dynamic performance of these converters does ...
  • Control of power converters in distributed generation applications under grid fault conditions 

    Rodríguez Cortés, Pedro; Luna Alloza, Álvaro; Muñoz Aguilar, Raúl Santiago; Córcoles López, Felipe; Teodorescu, Remus; Blaabjerg, Frede (IEEE, 2011)
    Conference report
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    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 ...
  • Control of PV generation systems using the synchronous power controller 

    Rodríguez Cortés, Pedro; Candela García, José Ignacio; Luna Alloza, Álvaro (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Conference report
    Restricted access - publisher's policy
    The high penetration of distributed generation, as PV or wind power, has forced the Transmission System Operators (TSOs) to set restrictive requirements for the operation of such systems. As it can be extracted from ...
  • Control of STATCOM in wind power plants based on induction generators during asymmetrical grid faults 

    Rodríguez Cortés, Pedro; Luna Alloza, Álvaro; Medeiros, G.; Teodorescu, Remus; Blaabjerg, F. (2010)
    Conference report
    Open Access
    This paper explores different strategies to set the reference current of a STATCOM under unbalanced grid voltage conditions. The aim of the proposed control strategies is to provide a set of reactive current references ...
  • Control of VSC-HVDC with electromechanical characteristics and unified primary strategy 

    Zhang, Weiyi; Rouzbehi, Kumars; Candela García, José Ignacio; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (2016)
    Conference report
    Open Access
    High voltage dc (HVDC) systems act as the prevailed solution for transmitting offshore wind energy to onshore main grids. Control of the voltage source converters (VSC) in HVDC systems is decisive for the performance. This ...
  • Control proposals for the operation of power converters in wind power systems 

    Luna Alloza, Álvaro; Aguilar, Daniel; Muñoz Aguilar, Raúl Santiago; Córcoles López, Felipe; Rodríguez Cortés, Pedro (IEEE, 2011)
    Conference report
    Open Access
    The wind turbines based on Doubly Fed Induction Generators (DFIG) represent almost the 60% of the installed windpower worldwide. Nowadays most of the existing algorithms, used for regulating the production of active and ...
  • Control strategies for DFIG wind turbines under grid fault conditions 

    Luna Alloza, Álvaro; Rolán Blanco, Alejandro; Medeiros, G.; Rodríguez Cortés, Pedro; Teodorescu, R. (2009)
    Conference lecture
    Open Access
    The classical control techniques for regulating the active and reactive power delivery in doubly fed induction generators (DFIG), for wind power applications, are normally based on voltage oriented control (VOC) strategies. ...