Method for evaluating power supply reliability of power distribution network

The invention discloses a method for evaluating the power supply reliability of a power distribution network and belongs to the field of power distribution network power supply. The method includes: reading the original data firstly and enumerating corresponding fault events for grid equipment; searching a transformer to obtain power supply interrupted regions caused by faults, conducting fault state simulation and distinguishing the recoverable power supply region from the unrecoverable power supply region; for each fault event of the recoverable power supply region, acquiring the load transferring path through the load transferring path analysis; conducting load flow calculation, if the load flow is overload and the load transferring is not successful, acquiring a new load transferring path; and calculating the reliability index of each load point and the whole power distribution network according to the recoverable power supply region and the unrecoverable power supply region after faults. The method can more accurately and comprehensively evaluate the power supply reliability of the power distribution network so that the level which the urban power grid can reach in the aspect of the power supply ability, the present problems and the development prospect can be deeply realized.