Coordinated charging of PEVs in unbalanced residential network based on worst node voltage profile

Abstract

Plug in Electric Vehicles (PEVs) have recently become available and are starting to penetrate the distribution system as new loads. There are a few potential issues associated with uncoordinated (random) charging of PEVs such as network congestion and overloading of distribution transformers. This paper explores the detrimental impacts of random PEV charging on the distribution transformer loading and bus voltage profiles of an unbalanced smart grid. The impacts of deferred plugging of vehicles that could be encouraged by introducing higher electricity prices during the peak load hours are also explored. Finally, a practical coordinated PEV charging approach through controlling the worst node voltage profile is proposed and implemented. Simulation results are presented using Matlab/Simulink software.