Reliability Assessment of Active Distribution Network Considering Path-Based Post-Fault Island Division

The national strategic goals of achieving peak carbon dioxide emissions and carbon neutrality, distributed generation (DG) is widely applied in distribution networks. With the connection of large-scale DGs, the operating characteristics of the active distribution network and its reliability assessment are significantly influenced. In this paper, the reliability model of DG is established firstly, considering the island formation of the distribution network containing the DG, this paper proposes a fast island division model solved by the path search algorithm. Then, taking into account the load restoration in the island after failures, an improved minimal path method is proposed, and reliability indices are refined, which are suitable for the reliability assessment of active distribution networks. Case studies demonstrate that the proposed method can be flexibly applied to the reliability assessment of active distribution networks under multiple conditions. Moreover, the results illustrate that the system reliability are related to the capacity, location, and failure rate of DG, which provides a basis for reliability improvement of active distribution networks.