After-test simulation method for internal and external failure recognition of double-circuit transmission line region based on Bergeron model

The invention relates to an after-test simulation method for internal and external failure recognition of a double-circuit transmission line region based on a Bergeron model, belonging to the technical field of relay protection of electrical power systems. The after-test simulation method comprises the steps of: measuring the voltages (uM and uN) and currents (iM and iN) at the head end M and the tail end N of the line in real time within a short time window after the double-circuit transmission line is in failure; and then, simulating and calculating the current on the tail end of the line through the voltage and current at the head end based on the Bergeron transmission line model, comparing the wave shapes of the simulation current and the actual measurement current iN, and calculating a relative coefficient r of the two components; and finally, recognizing the internal and external failures of the line region according to the wave shape similarity of the simulation current and the actual measurement curre