Reliability evaluation of medium voltage distribution network with private electric vehicle

With the energy crisis and environment problem increasing prominently, as a new means of transportation, electric vehicles (EV, Electric Vehicle) will be accessed to distribution networks more and more, leading to a huge challenge on power system reliability. This paper mainly studies the reliability evaluation of medium voltage distribution network with private EV accessed. First based on the residents commuting patterns, the impact of private EV charging and discharging characteristics on the load profile is analyzed quantitatively. Based on load zoning, the optimal driving route model with the objective function of the shortest path and shortest time is proposed, which is then solved by the dynamic programming algorithm. Finally, by considering EV charging and discharging characteristics, spatial distribution characteristics, EV charging and discharging model is proposed. Then by studying the impact of distribution system failures during EV charging and discharging process, novel reliability indices are defined. Based on the considerations above, Monte Carlo simulation method based on Latin Hypercube Sampling is applied for reliability evaluation of medium voltage distribution system considering private EV accessed. A modified IEEE-RBTS Bus2 system is used as an example to analyze the impact of EV accessed ratio and EV charging mode on distribution system reliability, verifying the feasibility and effectiveness of the model and method proposed.