A novel centralized charging station planning strategy considering urban power network structure strength

Considering detrimental impact on grid by sizeable and unpredictable electric vehicles (EVs) loads, establishing centralized charging stations through swapping batteries can be the future competitive development orientations in EV industry. Optimal centralized charging station planning is not only pervasive enough to meet the requirement of EV charging, but also has the potential to improve the rationality of power grid structure as a distributed power station. In this paper, a novel centralized charging, station strategy considering urban power network structure strength is proposed. Based on the analysis of time space characteristic of load shifting in normal urban life, power supply moment balance index is defined to represent fluctuation of supply capability between peak and valley under certain structure. Meanwhile, the investment of charging stations and network loss are considered as part of objective function with moment balance index, aiming at improving urban power network structure with minimal economic cost. Case study on IEEE 123-bus test distribution system illustrates the validity of the strategy proposed. (C) 2016 Elsevier B.V. All rights reserved.