Double-end weak feed system model identification fault direction discrimination method and related device

The invention discloses a double-end weak feed system model identification fault direction discrimination method and a related device, and the method comprises the steps: collecting voltage and current signals at a protection installation part of a transmission line, carrying out the preprocessing, calculating a zero-mode current and a mode current, and judging whether a fault is a grounding fault or a non-grounding fault according to the zero-mode current and the mode current; a forward fault fitting voltage is constructed; respectively calculating forward fault model conformity of the non-grounding fault and the grounding fault based on the forward fault fitting voltage; and judging the size relationship between the conformity of the forward fault model and the setting value, and judging forward and reverse faults. The method is not influenced by the new energy side operation condition and transition resistance, is suitable for the new energy connection MMC access system, and has an application prospect. 一种