A multiple layer power security design for a typical microgrid infrastructure with improved reliability and sustainability

An important consideration for the design of micro- grid for an uninterruptible infrastructure is the ability to ensure its continual operation regardless of the health of the utility grid. This paper proposes a multiple layer power security design concept for re-designing of such an uninterruptible electrical network with an improved reliability and sustainability by integrating with renewable resources and energy storage systems. The re-designed microgrid network and the control scheme were modelled and simulated in PowerFactory. Potential problems during the network re-design such as protection discrimination and power factor degradation due to high PV penetration have been analysed and solutions have been provided. System performance of the re-designed network has been evaluated through various test cases.