Overload risk state identifying method for power distribution network

The invention discloses an overload risk state identifying method for a power distribution network. Overload indexes are computed by history load information within a certain period before a certain t point, load real-time measurement information at the t point and load prediction information within a certain period after the t point of the power distribution network in an equivalent load method from the aspects of reality, continuity and foreseeability, overload index severity grades are generated, the overload indexes in the aspects of reality, continuity and foreseeability are analyzed according to the overload index severity grades, whether the power distribution network is in an overload risk state at the t point is judged according to the overload risk state judging steps of the power distribution network, and dynamic and continuous overload risk state tracking and identifying of the power distribution network are carried out. The method is suitable for identifying and warning the overload risk state in the self-healing control process of the power distribution network.