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A statistical analysis of the effect of electric vehicle battery charging on distribution system harmonic voltages

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4 Author(s)
Staats, P.T. ; Texas Univ., Austin, TX, USA ; Grady, W.M. ; Arapostathis, A. ; Thallam, R.S.

This paper presents a statistical method for predicting the effect that widespread electric vehicle (EV) battery charging will have on power distribution system harmonic voltage levels. The method uses a statistical model for nonlinear load currents to generate the probabilities of specific harmonic voltage levels. The statistical model for the harmonic currents produced by a concentration of EVs accounts for partial harmonics cancellation introduced by uncertainty and variation in charger start-time and initial battery state-of-charge. A general solution technique is presented along with several examples using data from a commercially-available EV charger and an actual power distribution system. The results show that there is a definite threshold penetration below which EV charging has negligible impact on the number of buses whose voltage total harmonic distortion (THDV) exceeds 5%. During the late evening of a summer day, the authors' example distribution system can accommodate EV penetration levels as high as 20%. A similar analysis of the system in the spring or fail indicates that the system can accommodate a 15% EV penetration before THDV exceeds 5% at an unacceptable number of buses

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Power Delivery, IEEE Transactions on  (Volume:13 ,  Issue: 2 )