Off-board electric vehicle battery charger using PV array

ABSTRACT

During the recent decade, the automobile industry is booming with the evolution of electric vehicle (EV). Battery charging system plays a major role in the development of EVs. Charging of EV battery from the grid increases its load demand. This leads to propose a photovoltaic (PV) array-based off-board EV battery charging system in this study. Irrespective of solar irradiations, the EV battery is to be charged constantly which is achieved by employing a backup battery bank in addition to the PV array. Using the sepic converter and three-phase bidirectional DC–DC converter, the proposed system is capable of charging the EV battery during both sunshine hours and non-sunshine hours. During peak sunshine hours, the backup battery gets charged along with the EV battery and during non-sunshine hours, the backup battery supports the charging of EV battery. The proposed charging system is simulated using Simulink in the MATLAB software and an experimental prototype is fabricated and tested in the laboratory and the results are furnished in this study.

BLOCK DIAGRAM:

Fig. 1  Block diagram of the EV battery charger

 EXPECTED SIMULATION RESULTS:

Fig. 2  Waveforms of PV array irradiation and gate pulses to the auxiliary switches

Fig. 3  Waveforms of

(a) PV array voltage, VPV & PV array current, IPV, (b) DC link voltage, Vdc, & current, Idc, (c) EV battery SOC, EV battery current, IBatt & EV battery voltage, VBatt, (d) Backup battery SOC, backup battery current, IBackup Batt & backup battery voltage, VBackup Batt

CONCLUSION

 

In this paper, an off-board EV battery charging system fed from PV array is proposed. This paper discusses the flexibility of the system to charge the EV battery constantly irrespective of the irradiation conditions. The system is designed and simulated in Simulink environment of the MATLAB software. The hardware prototype is fabricated and tested in laboratory for the three modes of operation of the proposed charging system separately and the results are furnished. In OPAL-RT Real time simulator OP4500, experimental investigation is carried out in RCP methodology and the dynamic response of the system is furnished both in simulation and experimental investigation. Correlation between the simulation and experimental results emphasise the effectiveness of the proposed charger.

REFERENCES

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