Power distribution network accurate load shedding method and system based on real-time network topology tracing

The invention provides a power distribution network accurate load shedding method and system based on real-time network topology tracing. The method comprises the steps that the network topology of a power distribution network is recognized in real time based on an intelligent terminal unit autonomous query mode; the intelligent terminal unit is used for relay query, the queried intelligent terminal unit directly responds to a mechanism, a topological tree formed by the connection relation of a superior transformer substation, a main line and a sequence table boundary switch is formed, and the switchable capacity of the transformer substation, namely a power supply area, is determined; and based on the determined switchable capacity of the power supply area, the local dispatching EMS remotely executes and issues the switchable capacity to the distribution (county) dispatching DMS, and the main network switch and the distribution network switch remotely control the opening to execute the switchable capacity. 本