Now showing items 1-20 of 322

    • A communication-assisted protection scheme for direct-current distribution networks 

      Monadi, Mehdi; Zamani, M. Amin; Koch-Ciobotaru, Cosmin; Candela García, José Ignacio; Rodríguez Cortés, Pedro (2016-05-27)
      Article
      Open Access
      One of the major issues associated with the implementation of direct-current distribution systems is the design of a proper protection scheme. The fault current characteristics in direct-current distribution systems are ...
    • A communication: assisted protection for MVDC distribution systems with distributed generation 

      Monadi, Mehdi; Gavriluta, Catalin; Candela García, José Ignacio; Rodríguez Cortés, Pedro (2015)
      Conference report
      Open Access
      In this paper, a communication-assisted protection scheme is proposed for medium voltage dc (MVDC) distribution networks. MVDC grids are applicable for connection between microgrids, upgrading the transmission capacity of ...
    • A comparative study of methods for estimating virtual flux at the point of common coupling in grid connected voltage source converters with LCL filter 

      Fazlin Roslan, Nurul; Suul, Jon Are; Rocabert Delgado, Joan; Rodríguez Cortés, Pedro (2017-08-23)
      Article
      Restricted access - publisher's policy
      Grid synchronization based on Virtual Flux (VF) estimation allows for control of grid-connected power converter without depending on AC-voltage measurements. This is useful in voltage-sensor-less applications for reducing ...
    • A comparative study of methods for estimating virtual flux at the point of common coupling in grid connected voltage source converters with LCL filter 

      Roslan, Nurul Fazlin; Suul, Jon Are; Luna Alloza, Álvaro; Rocabert Delgado, Joan; Candela García, José Ignacio; Rodríguez Cortés, Pedro (2016)
      Conference report
      Open Access
      Grid connected Voltage Source Converters (VSCs) with LCL filters usually have voltage measurements at the filter capacitors, while it can be important to control the active or reactive power injection at the grid-side of ...
    • A control strategy for DC-link voltage control containing PV generation and energy storage — An intelligent approach 

      Rouzbehi, Kumars; Miranian, Arash; Candela García, José Ignacio; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      In this paper, DC-link voltage control in DC microgrids with photovoltaic (PV) generation and battery, is addressed based on an intelligent approach. The proposed strategy is based on the modeling of the power interface, ...
    • A generalized voltage droop strategy for control of multi-terminal DC grids 

      Rouzbehi, Kumars; Miranian, Arash; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference lecture
      Restricted access - publisher's policy
      This paper proposes a generalized voltage droop (GVD) control strategy for control and power sharing in voltage source converter (VSC)-based multi-terminal DC (MTDC) grids. In the proposed approach, the conventional voltage ...
    • A generalized voltage droop strategy for control of multiterminal DC grids 

      Rouzbehi, Kumars; Miranian, Arash; Candela García, José Ignacio; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (2015-02)
      Article
      Open Access
      This paper proposes a generalized voltage droop (GVD) control strategy for dc voltage control and power sharing in voltage source converter (VSC)-based multiterminal dc (MTDC) grids. The proposed GVD control is implemented ...
    • A hierarchical control structure for multi-terminal VSC-based HVDC grids with GVD characteristics 

      Rouzbehi, Kumars; Miranian, Arash; Candela García, José Ignacio; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (2013)
      Conference lecture
      Restricted access - publisher's policy
      This paper presents a hierarchical control structure for Multi terminal HVDC grids. The hierarchical control structure is inspired by the three-layer control structure of largescale AC power systems and it is divided into ...
    • A hybrid power flow controller for flexible operation of multi-terminal DC grids 

      Rouzbehi, Kumars; Miranian, Arash; Candela García, José Ignacio; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      This paper develops a hybrid power flow controller (HPFC) to take one step forward for building future flexible DC transmission system (FDCTS). The idea for proposing HPFC is inspired by the successful operation of flexible ...
    • A low-disturbance diagnostic function integrated in the PV arrays' MPPT algorithm 

      Sera, Dezso; Mathe, L.; Kerekes, Tamas; Teodorescu, Remus; Rodríguez Cortés, Pedro (IEEE, 2011)
      Conference report
      Restricted access - publisher's policy
      This paper focuses on the estimation of series resistance changes for flat silicone PV panels or arrays during operation, without moving the operating point far away from the Maximum Power Point1. The method is based ...
    • A new high-efficiency single-phase transformerless PV inverter topology 

      Kerekes, Tamas; Teodorescu, Remus; Rodríguez Cortés, Pedro; Vázquez Guzmán, Gerardo; Aldabas Rubira, Emiliano (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-01)
      Article
      Open Access
      There is a strong trend in the photovoltaic inverter technology to use transformerless topologies in order to acquire higher efficiencies combining with very low ground leakage current. In this paper, a new topology, ...
    • A new PWM strategy for grid-connected half-bridge active NPC converters with losses distribution balancing mechanism 

      Ma, Lin; Kerekes, Tamas; Rodríguez Cortés, Pedro; Jin, Xinmin; Teodorescu, Remus; Liserre, Marco (2015-01-09)
      Article
      Open Access
      Photovoltaic systems technological development is driven by the request for higher efficiency and safety. These concerns influence also the choice of the power converter stage. Several topologies have been proposed and ...
    • A novel approach for voltage control of multi-terminal DC grids with offshore wind farms 

      Rouzbehi, Kumars; Miranian, Arash; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (2013)
      Conference lecture
      Restricted access - publisher's policy
      This paper proposes a novel control strategy in multi-terminal DC (MTDC) grids with offshore wind generation based on the idea of generalized voltage droop (GVD). In the proposed strategy, the GVD characteristics are ...
    • A photovoltaic three-phase topology to reduce common mode voltage 

      Vázquez Guzmán, Gerardo; Kerekes, Tamas; Rocabert Delgado, Joan; Rodríguez Cortés, Pedro; Teodorescu, Remus; Aguilar, Daniel (2010)
      Conference report
      Open Access
      At the present time most of the photovoltaic (PV) applications require to be integrated to the electrical grid. There are mainly two types of PV systems: with galvanic isolation (transformer) and transformerless. PV ...
    • A proportional resonant controller tuning method for grid connected power converters with LCL+trap filter 

      Zhang, Weiyi; Mir Cantarellas, Antonio; Remón, D.; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro (2014)
      Conference report
      Restricted access - publisher's policy
      Three-phase power converters are largely employed in power generation facilities based on renewable energy sources, and these converters commonly working in grid connection mode are frequently connected to the grid through ...
    • 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 sensor-less sliding mode control scheme for a stand-alone wound rotor synchronous generator under unbalanced load conditions 

      Muñoz Aguilar, Raúl Santiago; Rodríguez Cortés, Pedro; Dòria Cerezo, Arnau; Candela García, José Ignacio; Luna Alloza, Álvaro (2004-09)
      Article
      Restricted access - publisher's policy
      This paper presents a sliding mode control for a wound rotor synchronous machine acting as an isolated generator connected to an unbalanced load. In order to simplify the control methodology, the standard dq-model of the ...
    • 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 single leg switched PWM method for three-phase H-bridge voltage source converters 

      Senturk, Osman S.; Munk-Nielsen, Stig; Teodorescu, Remus; Helle, Lars; Rodríguez Cortés, Pedro (2009)
      Conference lecture
      Open Access
      This paper proposes a single leg switched or a hybrid PWM (HPWM) method for three-phase three-level HBridge Voltage Source Converters (3L-HB-VSCs). By means of the proposed modulation, a 3L-HB-VSC can generate the ...