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Percorrer por autor "Gil, N. J."

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  • Islanding operation of active distribution grids using an agent-based architecture
    Publication . Issicaba, D.; Gil, N. J.; Lopes, J. A. Peças
    This paper presents a decentralized architecture for the islanding operation of distribution grids with large volume of distributed generation. This architecture involves the definition of network blocks which share the responsibility of frequency control. The control block abstraction was particularly designed to support the transition from regular grids to smart grids. In addition, the control schemes were developed using an agentbased paradigm. Hence, an agent-based simulation platform was implemented using libraries from the Java Agent Development Framework (JADE). The control schemes were evaluated using a test system with different sorts of distributed energy resources and modeled in the EUROSTAG environment. Simulation results show the effectiveness of the control architecture when different failure events are applied to the test system.
    2010-10Comunicação em conferência Acesso restrito Ver mais
  • Service restoration on distribution systems using Multi‐MicroGrids
    Publication . Resende, F. O.; Gil, N. J.; Lopes, J. A. Peças
    Large scale integration of distributed generation of both medium and low voltage (LV) networks can be achieved by exploiting the Multi‐MicroGrid (MMG) concept, a new distribution system architecture comprising a hierarchical control system, which allows the coordination among distributed generation units and MicroGrids (MGs) and therefore the operation of such a system in islanded mode. After a general blackout the MMG capabilities can also be used to provide service restoration in distribution systems. A new procedure for MMGs black start is then addressed in this paper. A sequence of control actions is defined and evaluated through numerical simulations. Fully automation of the entire MMG black start procedure is discussed along the paper. The results obtained demonstrate the feasibility of the proposed sequence of control actions and highlight some accomplishments that should be considered in order to successfully restore the MMG service, ensuring system stability and power quality.
    2011-03Artigo científico Acesso aberto Ver mais