Method and device for automatically selecting extra-high voltage alternating-current and direct-current drop points

The invention discloses a method and device for automatically selecting extra-high voltage alternating-current and direct-current drop points. The method comprises the steps of reading in optional alternating-current and direct-current drop points nearby a transformer substation according to electric power system load flow data files, using circuits between the optional alternating-current and direct-current drop points and the transformer substation as data of newly-added circuits, counting the number of the optional alternating-current and direct-current drop points, determining the number of particles and the number of iterations of a particle swarm point selecting portion according to the number of the optional alternating-current and direct-current drop points, initializing the particle swarm point selection portion, generating position vectors of point selection particles, updating the alternating-current and direct-current drop points, determining the number of particles and the number of iterations of a particle swarm line selection portion, and the like. According to the method and device for automatically selecting the extra-high voltage alternating-current and direct-current drop points, an alternating-current and direct-current drop point access system and a corresponding wiring mode are considered at the same time, and compared with an existing method, the method is more comprehensive and better in economical performance of the obtained result.