Abstract
With rapid growth of electrical vehicles accessed to grid, EVs charging is considered to be a crucial part of demand side flexibility in future smart grid. Uncoordinated charging of EVs in a high-penetration system can increase peak load and create new peaks in the total load (including EV load and original load) profile. Therefore, it is necessary to optimize the charging profile to avoid the harmful effects. Both of coordinated charging strategies proposed in this project can obviously decease charging cost and reduce peak load of profile.