Power supply reliability-oriented secondary optimization evaluation model for reliability of power distribution network

The invention discloses a power supply reliability-oriented secondary optimization evaluation model for the reliability of a power distribution network. The evaluation model comprises a smallest isolation area sub-model, a failing area influence sub-model and a load area statistical sub-model, wherein a double-layer heterogeneous structure is adopted for each of the sub-models and the evaluation model, and comprises a probability layer and a frequency layer, which are used for calculating a power failure probability index and a power failure frequency index respectively, graphic structures of the probability layers and the frequency layers are the same, and a layer of graphic structure can correspond to two layers of data during model storage. According to the power supply reliability-oriented secondary optimization evaluation model for the reliability of the power distribution network, an intuitive graphical method, a solid probability theory basis and an effective reasoning algorithm are used for performing modeling and reliability analysis on the power distribution network.