Abstract

The conventional analysis of reliability of power systems is well established, but for the problem caused by extreme natural disasters, there is of great significance to establish the evaluation method to analyze the ability of the distributed systems to withstand the destruction caused by the extreme natural disasters. Compared with the traditional reliability analysis, the concept of the distributed system resilience indexes (RI) which mainly focus on the highly destructive but rare events is presented in this paper to indicate this kind of ability. Seism is a typical rare event, which has different characteristics of damage to power grid compared to other highly destructive rare events. And the impact on the power grid resilience caused by the distributed photovoltaic (PV) cluster interconnected to the grid is also discussed. After analyzing these characteristics, this paper proposes the RI of distributed systems respectively based on the features of seism and the way of how to calculate it. Finally, an example of a distribution system model is used to verify the validity of the resilience indexes.

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