Research on the Access Capacity of Power System to Electric Vehicles Under Battery Swapping Modes

Abstract

In view of the access capacity of the power system to electric vehicles, not only whether the power generation side can meet the load demand of electric vehicles shall be considered, but also the changes in voltage quality, capacity of lines and transformers, short-circuit current after electric vehicles accessed shall be comprehensively taken into account. Considering the electric vehicles supplement energy by swapping batteries, in a multi-objective optimization method, through the service capacity analysis of charging stations and combined with economic indicators, an improved particle swarm optimization algorithm with mutation operator was applied, and a calculation method for maximum number of electric vehicles in power system was proposed. Finally, simulation for the power system of a certain district was performed, the maximum electric vehicle capacity that can be accessed to the power system was calculated, and the corresponding site selection of centralized charging stations and charging & battery swapping stations were given.