Impacts of uncoordinated and coordinated integration of electric vehicles on distribution systems performance

Now a days, Electric Vehicle (EV) integration to the distribution system is gradually increasing and is hitting with much power quality issues. This paper investigates the impacts of EVs integration into the distribution systems and highlights possible detrimental operational performance such as feeders and transformers overloading, lower voltage profiles, higher system losses and operational cost. EV integration is realized with two charging schemes; coordinated and uncoordinated for two EV penetration levels; 30% and 100%. A benchmark (RBTS) test system, and a real distribution network in Egypt (ShC-D8) are modeled. Each test system includes its own daily load and cost variations model. Simulations are performed to investigate the influence of EVs penetration and coordination on voltage profile, feeders and transformers loading, system losses, operational cost, voltage profile, and the daily load curves. Simulation results show that: the EVs penetration levels have a major effects on system performance, uncoordinated charging result in a negative impacts on system performance, and coordinate charging mitigate that negative impacts.