The Local Ordered Charging Strategy of Electric Vehicles Based on Energy Routers under Three-Phase Balance of Residential Fields

Abstract

With the popularization of electric private cars and the increase of charging facilities in residential areas, disorderly charging will affect the power supply efficiency of their distribution transformers and the quality of electricity used by users in residential areas. In severe cases, it may even cause vibration of the power grid, causing serious three-phase imbalance problems such as single-phase burnout of transformers or insulation breakdown of household appliances. This paper analyzes the influencing factors of the unbalanced operation of each phase of the distribution transformer and the electrical load characteristics of typical residential areas. Based on the photovoltaic output of the station area, the charging and discharging capacity of the energy storage system, and the orderly charging plan of residential electric vehicles, a local orderly charging strategy for electric vehicles based on energy routers under the three-phase balance of the residential area is proposed. This strategy can realize the three-phase balance control of the distribution transformer. The effectiveness of the method is verified by a typical scenario example. The control method is changed to minimize the three-phase imbalance in residential areas and improve the low utilization rate of the distribution network and the comprehensive utilization efficiency of adjustable resources in residential areas.

Optimization of Control Strategy for Orderly Charging of Electric Vehicles in Mountainous Cities

“…Based on the results of the 2017 U.S. Department of Transportation survey of private automobiles in the USA, it is known that EV users' travel and return times roughly follow a normal distribution. EVs' daily mileage also roughly follows a normal distribution [21].…”

Multi-Fractal Weibull Adaptive Model for the Remaining Useful Life Prediction of Electric Vehicle Lithium Batteries

“…In the charging stage of the battery cycle, the electric car is plugged into the power system to absorb electricity as a kind of single-phase load [ 3 ]. In the discharging stage, the electricity is discharged from the battery to power the electric motor [ 4 ].…”