Design microgrid for a distribution network: A case study of the University of Queensland

With more and more distributed generators (photovoltaic and wind) and distributed energy resources being integrated into power networks, traditional electricity grids may be replaced by smaller and more efficient grids called microgrids. Especially in recent years, there has been a significant increase in photovoltaic (PV) installations in Australia. As such, potential for microgrids to continue supply power to loads during a blackout was evident. However, microgrids have posed a concern for utilities as they do not provide utilities the same ability as the conventional grid to regulate microgrid voltage and frequency, and later possibly interfere with restoration of normal electricity supply. This paper investigates the feasibility of forming a microgrid in the University of Queensland for continuous electricity supply during power outage by utilizing its PV and storage systems. A simple but effective load shedding algorithm based on existing schemes and future technologies has been implemented. It also demonstrates how microgrid resynchronization can be achieved.