Recharging of EV in a typical Italian urban area: Evaluation of the hosting capacity

The paper addresses impact on planning of Low Voltage (LV) distribution grids within the urban area of a major Italian metropolis due to the introduction of the Electric Mobility. It takes into account that, in this area, the diffusion of Electric Vehicles (EV), will be greater than in the rest of Italy. Two scenarios are analyzed. In the 2020 scenario, the expected penetration of cars in LV distribution grids will require the substitution of a small amount of MV/LV transformers, while in the 2030 scenario, the amount of EV recharging on LV networks will double, since all additional EV will use fast charging stations connected to MV lines. In the worst case, less that 3% of MV/LV transformers will need to be considered for substitution. Hosting capacity of each lateral feeder, feeder and main feeder of a LV grid are also evaluated. For this purpose data collected by the smart metering systems become very helpful. The hosting capacity is calculated as the difference of the rating of each cable and load curves obtained integrating load curves recorded by smart meters of each customer.