Modeling and planning of EV fast charging station in power grid

Abstract

Introduction of the electric vehicle (EV) to the transport sector is greatly anticipated considering numerous environmental and socio-economical benefits. Consideration of their charging impact on electricity networks is of major importance to power system engineers under such circumstances. A number of system studies can be found in the literature describing different aspects of EV charging on power grid. However, scant attention has been paid to the issue of power system stability due to EV charging. Practicality of the power system stability studies is mainly determined by the accuracy of the models used to represent the EV load. However, EV load modeling for system stability studies has not yet been considered in the literature. Hence, for this study, a static load model has been developed for a universal input battery charger at the first stage. The second phase of the study considers static voltage stability margins, system losses, the regulatory voltage limits, and the cable flow ratings for appropriate placement of EV fast charging stations in electricity grid. Further, the maximum allowable charging station capacity at a network point is evaluated based on reliable and stable grid operation.