Peak shaving and power losses minimization by coordination of plug-in electric vehicles charging and discharging in smart grids

Uncontrolled and random charging and discharging of plug-in electric vehicles (PEVs) can lead to incremental power losses, overloads and voltage fluctuations which are harmful for reliability and security of smart distribution systems. To overcome these disadvantages, in this paper a new approach is presented for coordination of multiple domestic PEVs charging and discharging based on peak shaving and minimization of active power losses. The proposed procedure enables the PEVs owners to select the preferred charging and discharging time zones based on priority selection. For this purpose, three charging and discharging time intervals have been considered for domestic PEV owners which give them opportunity to choose the preferred time zone based on their requirements. The proposed method considers random plug-in of PEVs and enables PEVs to begin charging and discharging as soon as possible while complying with network operation criteria. A smart distribution 1537-bus test system is employed to demonstrate the feasibility and efficacy of the proposed approach for charging and discharging management of PEVs in smart parking lots.