Self-adaptive current fast tripping protection method for distribution network comprising inverse distributed power

The invention belongs to the technical field of relay protection of distribution networks, relates to a protection method for a distribution network comprising inverse distributed power, and provides an improved self-adaptive current fast tripping protection proposal comprising an IIDG power distribution system on the basis of the prior self-adaptive current fast tripping protection. The protection method still performs online setting on protection according to the prior mode of a self-adaptive setting value expression under the condition of no consideration of the connection of an IIDG when the IIDG is connected to the rear side of the protection, utilizes a negative sequence component to solve for the actual equivalent impedance of the rear side of the protection and uses an equivalent electric potential under the current failure state to set the protection under the condition of two-phase short circuit, still adopts a calculation method under the condition of no connection of the IIDG to solve for the equivalent impedance under the current failure state, obtains a corresponding equivalent electric potential according to the equivalent impedance, and uses the equivalent electric potential to set the protection under the condition of three-phase short circuit. The method improves the prior current protection configuration and guarantees the reliable failure removal of a distribution system comprising an inverse DG.