Master station and substation combined topology identification method

The invention relates to a master station and substation combined topology identification method. The master station and substation combined topology identification method comprises the following steps of (1) estimating the state of a substation, (2) sending the estimation result, and (3) carrying out state estimation and topology identification on a master station. The master station and substation combined topology identification method applies a remote signaling identification result of a transformer substation system to the state estimation and the topology identification of the master station on line, makes full use of the characteristics of sufficient redundancy and good time consistency of telemetry information of a transformer station, improves the accuracy and practicability of topology identification of a master station system, and further improves the accuracy and usability of the result of on-line dispatching and analysis software of a power grid.