Bidirectional Conductive Charging of Electric Vehicles for V2V Energy Exchange

ABSTRACT:

 Battery-powered Electric Vehicles (EVs) are considered as an effective solution to curb carbon emissions and fight global warming. One of the main drawbacks in driving an EV is range anxiety, which can be defined as the fear of vehicle having insufficient range to reach its destination due to lack of charging. Vehicle-to-vehicle (V2V) charging is being explored as a solution to mitigate the range anxiety issue. V2V charging allows the sharing of charge between two EVs so that if an EV is stranded far from a charging station, it can be charged from another EV. Various V2V chargers have been studied. It has been found that the traditional chargers involve many power conversion stages, which reduces the efficiency in the energy exchange. In this paper, an off-board DC V2V charger is presented. It reduces the power conversion stages while dispensing with the use of any on-board charger. To implement the off-board DC V2V charger, a bidirectional DC-DC converter is adopted. The converter operates in various modes, depending upon voltage and state of charge of the EV batteries. In turn, the V2V charging is managed in an automatic way. Operation modes and management program of the off-board V2V charger are discussed in the paper.

KEYWORDS:

1.      V2V charging

2.      Battery SOC

3.      Bidirectional buck boost converter

 SOFTWARE: MATLAB/SIMULINK

 CONCLUSION:

The V2V conductive charging is a viable way to share charge between the batteries of two EVs; it can be used when an EV is stranded due to lack of charging and it did not stop at a charging station. The efficiency of the traditional V2V chargers is poor due to the presence of many power conversion stages. To overcome such an issue, this paper has explored an off-board DC V2V charger that utilizes only one DC-DC power conversion stage constituted by a BBB converter. The charger has been examined thoroughly, illustrating the six different modes of operation and addressing the V2V charging management. Throughout the paper, a BBB converter is sized, and simulations of its operation are carried out on a MATLAB Simulink platform. It is expected that hardware implementation of the BBB converter and its control system together with their testing in a practical environment can validate effectiveness and benefits of off-board DC V2V charging.

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