Power distribution network planning method and device considering fast charging demand flexibility of electric vehicle

The invention provides a power distribution network planning method and device considering fast charging demand flexibility of an electric vehicle, and belongs to the technical field of power distribution network planning. The method comprises the following steps: establishing an electric vehicle fast charging demand space flexibility model composed of a traffic flow constraint, an electric power-traffic coupling constraint and a time cost constraint; dimension reduction is carried out on the traffic flow constraint, the electric power-traffic coupling constraint and the time cost constraint, and a dimension reduction model of the electric vehicle fast charging demand space flexibility on the electric power system side is established; and embedding the dimension reduction model into each scene to obtain a fast charging station load adjustment constraint, and then establishing and solving a power distribution network extension planning model considering the electric vehicle fast charging demand space flexibili