Reliability assessment of active distribution grids with flexibility resources and flexible grid topology

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Abstract
This paper presents a methodology for reliability assessment of radially operated distribution grids that accounts for multiple measures for managing reliability of supply. This includes self-healing functionality that utilizes the flexibility of the grid topology, and the use of flexibility resources such as energy storage systems and loads with non-firm connection agreements. The methodology is implemented in an open source software tool based on graph-theoretical concepts. It is then demonstrated how this tool can be used to explore the collective impact of different combinations of measures as well as interactions between them. For a case study for a medium-voltage reference grid it was found significant interactions and synergistic effects between the capacity of reserve connection and the extent of self-healing functionality while relatively modest interactions were found for other combinations of measures.

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