Now showing items 1-6 of 6

  • Connection and disconnection transients for micro-grids under unbalance load condition 

    Rocabert Delgado, Joan; Azevedo, Gustavo M.S.; Candela García, José Ignacio; Blaabjerg, Frede; Rodríguez Cortés, Pedro (2011)
    Conference report
    Restricted access - publisher's policy
    The recent grid integration of Distributed Energy Resources (DER) possibility the formation of intentional islands in the case of a grid fault conditions. For such island formation is required an active agent capable 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 ...
  • Enhanced power calculator for droop control in single-phase systems 

    Azevedo, Gustavo M.S.; Calvancanti, M; Bradaschia, F.; Neves, F.; Rocabert Delgado, Joan; Rodríguez Cortés, Pedro (IEEE, 2011)
    Conference report
    Restricted access - publisher's policy
    Droop control is a common method to parallel operation of inverters. This method uses the average values of power components which are usually obtained through low-pass filters. However, in single-phase systems the power ...
  • New control strategy to allow the photovoltaic systems operation under grid faults 

    Azevedo, Gustavo M.S.; Rodríguez Cortés, Pedro; Cavalcanti, Marcelo C.; Vázquez Guzmán, Gerardo; Neves, F. (2009)
    Conference lecture
    Open Access
    This paper presents a new control strategy that allows the photovoltaic system operation under grid faults without overcurrent and assuring grid sinusoidal currents. The current limiter is made indirectly by using an ...
  • Performance improvement of the droop control for single-phase inverters 

    Azevedo, Gustavo M.S.; Calvancanti, M; Neves, F.; Rodríguez Cortés, Pedro; Rocabert Delgado, Joan (2011)
    Conference report
    Restricted access - publisher's policy
    The droop control uses the local average values of the active and reactive power components for sharing the load power demand among inverters in parallel. In this paper, a method that uses a virtual quadrature reference ...
  • Safe transient operation of microgrids based on master-slave configuration 

    Azevedo, Gustavo M.S.; Bradaschia, F.; Calvancanti, M; Neves, F.; Rodríguez Cortés, Pedro; Rocabert Delgado, Joan (IEEE Press. Institute of Electrical and Electronics Engineers, 2011)
    Conference report
    Restricted access - publisher's policy
    Master-Slave configuration is a suitable alternative to droop control method used in microgrids. In this configuration, only one inverter is the master, while the others are slaves. The slave inverters are always current ...