An optimal configuration scheme for “scheduled charging and discharging” mode of electric vehicles

Abstract

The surge in the number of electric vehicles （EVs） has exacerbated issues such as voltage violations and line losses in distribution networks. In order to optimize the one-way and random charging interaction mode between EV loads and distribution networks， a “scheduled charging and discharging” mode for EVs and its optimization configuration scheme are proposed. This scheme aggregates large-scale EV loads in different time slots and takes account of the collaborative optimization between renewable distributed generation （RDG） and EV charging stations， effectively reducing network losses of active power， minimizing voltage deviations， and ensuring the safe and stable operation of distribution networks. Firstly， a mathematical model considering coordinated active and reactive power configuration of the “scheduled charging and discharging” mode of EVs in distribution networks is established. The active and reactive power outputs of EV charging stations and the reactive power output of RDG are considered as optimization variables. Secondly， the second-order cone relaxation （SOCR） method is employed to convert the original non-convex feasible domain into a convex second-order cone feasible domain， thereby obtaining the optimal solution of the mathematical model. Finally， an improved IEEE 33-node system is selected for simulation to verify the feasibility and effectiveness of the proposed scheme.

Keywords

• ev
• rdg
• load peak-valley difference
• active power network loss
• voltage deviation