City domain railway bilateral power supply traction network fault segmentation identification method and system

The invention provides a city railway bilateral power supply traction network fault segmentation identification method and system. Comprising the following steps. The voltage phasor of the transverse connection line HLn at the t moment and the voltage phasor at the t + delta t moment are obtained; the voltage variable quantity of the transverse connection line HLn is calculated according to the voltage phasor of the transverse connection line HLn at the t moment and the voltage phasor at the t + delta t moment; a traction network fault voltage component matrix is calculated according to the voltage variable quantity of all the transverse connection lines HLn of the line; a fault segment s is judged according to the traction network fault voltage component matrix; obtaining the current phasor of the head-end transverse connection line HLs and the current phasor of the tail-end transverse connection line HLs + 1 of the fault section s at the moment t + delta t, and calculating the flow directions phi s and phi