Smart charging of PV-Wind hybrid integrated PHEVs based on DC link voltage sensing

Abstract

The demand of plug in hybrid electric vehicle is increasing day by day. This paper introduces a charging station architecture by using a combination of PV-Wind hybrid system and smart charging strategies for plug-in hybrid electric vehicles (PHEVs). With the increasing in the number of PHEVs, the demand on the electric grid increases appreciably. The proliferation in the number of PHEVs will trigger extreme surges in demand while charging them during peak hours. To avoid this problem, a sma r t charging station architecture is proposed in which the rate of charging the PHEVs, is controlled in such a way that the effect of charging during peak load period is not felt on the grid. The power required to charge the plug in hybrids comes from PV-Wind hybrid system or the utility or both. The three way interaction between the PHEVs, hybrid source and the grid ensures optimal usage of available power, charging time and grid stability. The system consists of a PV-Wind hybrid system, DC/DC boost converter, DC/DC buck converter and DC/AC bi-directional converter. The output of DC/DC boost converter and input of DC/AC bi-directional converter share a common DC link. The control strategy is based on DC link voltage sensing is proposed for the above system for efficient and reliable energy transfer. Simulation studies are performed along with the theoretical analysis to validate the proposed method.