Load ratio optimization of Urban Power Grid Considering penetration of electric vehicles

In recent years, with the transformation of energy use forms and the promotion of national policies, a large number of new loads, represented by electric vehicles, have gradually infiltrated into the urban power grid, which has brought a certain impact on the operation of the power grid, and the traditional grid planning lacks the adaptability to the impact of the scale of the electric vehicle load. Therefore, according to the load characteristics and the current development trend of electric vehicle, this paper analyzes its influence on the load capacity ratio of electric network. In addition, a kind of capacity load ratio optimization model which considers the overall economy of different voltage grades is put forward, and the influence of different electric vehicle permeability on the value of load ratio and transformer type selection is analyzed, thus the level of power grid planning is improved and the electric vehicle access demand is satisfied better.