Impact Assessment of Electric Vehicle Charging on Distribution Transformers Including State-of-Charge

In this study, the impact of electric vehicle (EV) battery charging on distribution transformer (DT) is assessed in addition to the conventional loads connected to the grid. Current harmonic spectrums of different charging levels are used to analyze the effects of commercially available EV chargers on the losses, temperature rise and lifetime of a sample 1500 kVA transformer. The harmonic spectrum data take into account the state-of-charge (SOC) for more accuracy. The results for Level I/II chargers and Level III chargers are both discussed.

[1]  M.I. Samesima,et al.  Analysis of transformer loss of life driving nonlinear industrial loads by the finite elements approach , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[2]  Robert B. Bass,et al.  Impacts of Electric Vehicle Charging on Electric Power Distribution Systems , 2013 .

[3]  Thomas Bräunl,et al.  Modelling the impacts of electric vehicle recharging on the Western Australian electricity supply system , 2011 .

[4]  Walid G. Morsi,et al.  Probabilistic Impact of Transportation Electrification on the Loss-of-Life of Distribution Transformers in the Presence of Rooftop Solar Photovoltaic , 2015, IEEE Transactions on Sustainable Energy.

[5]  D. M. Said,et al.  Analysis of distribution transformer losses and life expectancy using measured harmonic data , 2010, Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010.

[6]  Surya Santoso,et al.  Electric Vehicle Charging on Residential Distribution Systems: Impacts and Mitigations , 2015, IEEE Access.

[7]  M. Yilmaz,et al.  Review of charging power levels and infrastructure for plug-in electric and hybrid vehicles , 2012, 2012 IEEE International Electric Vehicle Conference.

[8]  N. C. Kar,et al.  Impact analysis of EV battery charging on the power system distribution transformers , 2012, 2012 IEEE International Electric Vehicle Conference.

[9]  Bala Venkatesh,et al.  Impact of EV Charger Load on Distribution Network Capacity: A Case Study in Toronto , 2016, Canadian Journal of Electrical and Computer Engineering.

[10]  Susan Redline,et al.  IEEE Guide for Loading Mineral- Oil-Immersed Transformers and Step-Voltage Regulators , 2012 .

[11]  Marcelo Di Paolo.  Analysis of harmonic impact of electric vehicle charging on the electric power grid, based on smart grid regional demonstration project — Los angeles , 2017 .

[12]  Gulderen Yildirmaz,et al.  The effects of the harmonic components upon transformer active losses in case of (non)sinusoidal sources and (non)linear loads , 2000, Proceedings of IEEE International Conference on Industrial Technology 2000 (IEEE Cat. No.00TH8482).