Effects of PEV Penetration on Voltage Unbalance

  • Ahmed M. A. Haidar
  • Kashem M. Muttaqi
Part of the Power Systems book series (POWSYS)


Balancing loads in low voltage networks is a challenging task due to a continuous fluctuation in the power demand. Voltage unbalance is a condition in which the voltage phasors differ in amplitude and/or do not have its normal 120° phase relationship. This has a potential to introduce technical issues that lead to a costly phenomenon for power distribution system due to the high penetration of Plug-in Electric Vehicles (PEVs). Voltage unbalance study is essential as the propagation of zero sequence component in the distribution system is limited by transformer winding connections and network grounding. Indeed, single phase loads are not affected by unbalance unless the unbalance causes over or under voltages which exceed the acceptable limits. However, the large numbers of PEVs charging from single phase residential feeders of distribution networks may exceed the statutory limits. This chapter presents theoretical discussion with analytical framework for modeling the effects of voltage unbalances due to PEV penetration. A PEV charging profile of a conventional PEV battery has been employed with the daily load demand to synthesize the dynamic effect of PEV penetration. A distribution network topology has been used with unbalanced allocation of single-phase loads and PEVs connected in four-wire, three phase network to investigate the effects of PEV charging on the feeders subject to voltage unbalance. Furthermore, the chapter explores the application of PEV load balancing strategy in the context of smart grid to mitigate the effects of unbalanced allocation of PEVs.


Plug-in electric vehicle Voltage unbalance factor PEV load balancing Low voltage distribution 


  1. 1.
    Adrian P (2011) Active load balancing in a three-phase network by reactive power compensation. In: Ahmed Z (ed) Power quality monitoring, analysis and enhancement, InTech, Europe, pp 219–254Google Scholar
  2. 2.
    Hosseinzadeh N et al (2004) A proposal to investigate the problems of three-phase distribution feeders supplying power to SWER systems. In: Australasian universities power engineering conference (AUPEC), pp 1–7Google Scholar
  3. 3.
    Kashem M, Ledwich G (2004) Distributed generation as voltage support for single wire earth return systems. IEEE Trans Power Deliv 19(3):1002–1011CrossRefGoogle Scholar
  4. 4.
    Vic G, Sarath P, Vic S (2002) Voltage unbalance. Technical note, Australian Power Quality and Reliability Centre, pp 1–7Google Scholar
  5. 5.
    Yaw-Juen W (2001) Analysis of effects of three-phase voltage unbalance on induction motors with emphasis on the angle of the complex voltage unbalance factor. IEEE Trans Energy Convers 16(3):270–275CrossRefGoogle Scholar
  6. 6.
    Jan-E-Alam Md, Kashem M, Danny S (2014) An approach for online assessment of rooftop solar PV impacts on low-voltage distribution networks. IEEE Trans Sustain Energy 5(2):663–672CrossRefGoogle Scholar
  7. 7.
    Tsai-Hsiang C, Jeng-Tyan C (2000) Optimal phase arrangement of distribution transformers connected to a primary feeder for system unbalance improvement and loss reduction using a genetic algorithm. IEEE Trans Power Syst 15(3):994–1000CrossRefGoogle Scholar
  8. 8.
    Woolley N, Milanovic J (2012) Statistical estimation of the source and level of voltage unbalance in distribution networks. IEEE Trans Power Deliv 27(3):1450–1460CrossRefGoogle Scholar
  9. 9.
    Araujo L, Penido D, Carneiro S Jr, Pereira J (2013) A three-phase optimal power-flow algorithm to mitigate voltage unbalance. IEEE Trans Power Deliv 28(4):2394–2402CrossRefGoogle Scholar
  10. 10.
    Paranavithana P, Perera S, Koch R, Emin Z (2009) Global voltage unbalance in MV networks due to line asymmetries. IEEE Trans Power Deliv 24(4):2353–2360CrossRefGoogle Scholar
  11. 11.
    Md Jan-E-Alam, Kashem M, Danny S (2013) Effectiveness of traditional mitigation strategies for neutral current and voltage problems under high penetration of rooftop PV. In: IEEE power and energy society general meeting (PES), pp 1–5Google Scholar
  12. 12.
    Chen C, Ku T, Lin C (2011) Design of phase identification system to support three-phase loading balance of distribution feeders. In: IEEE conference on industrial and commercial power systems technical, pp 1–8Google Scholar
  13. 13.
    Moses P, Deilami S, Masoum A, Masoum M (2010) Power quality of smart grids with plug-in electric vehicles considering battery charging profile. In: IEEE PES innovative smart grid technologies, pp 1–7Google Scholar
  14. 14.
    Gomez J, Morcos M (2003) Impact of EV battery chargers on the power quality of distribution systems. IEEE Trans Power Deliv 18(3):975–981CrossRefGoogle Scholar
  15. 15.
    Tanaka T et al (2013) Smart charger for electric vehicles with power-quality compensator on single-phase three-wire distribution feeders. IEEE Trans Ind Appl 49(6):2628–2635CrossRefGoogle Scholar
  16. 16.
    Sortomme E, Hindi M, James S, Venkata S (2011) Coordinated charging of plug-in hybrid electric vehicles to minimize distribution system losses. IEEE Trans Smart Grid 2(1):198–205CrossRefGoogle Scholar
  17. 17.
    Putrus G et al (2009) Impact of electric vehicles on power distribution networks. In: IEEE conference on vehicle power and propulsion, pp 827–831Google Scholar
  18. 18.
    Shahnia F, Ghosh A, Ledwich G, Zare F (2013) Predicting voltage unbalance impacts of plug-in electric vehicles penetration in residential low-voltage distribution networks. Electr Power Compon Syst 41(16):1594–1616CrossRefGoogle Scholar
  19. 19.
    Liu Z, Milanovic J (2013) Probabilistic estimation of voltage unbalance in distribution networks with asymmetrical loads. In: 22nd international conference on electricity distribution, pp 1–5Google Scholar
  20. 20.
    Singh A, Singh G, Mitra R (2007) Some observations on definitions of voltage unbalance. In: IEEE conference on power symposium, pp 473–479Google Scholar
  21. 21.
    Pillay P, Manyage M (2001) Definitions of voltage unbalance. IEEE Power Eng Rev Mag 21(5):50–51CrossRefGoogle Scholar
  22. 22.
    Garcia D et al (2009) Voltage unbalance numerical evaluation and minimization. Electr Power Syst Res 79(10):1441–1445CrossRefGoogle Scholar
  23. 23.
    John J, William D (1994) Power system analysis. McGraw-Hill, New YorkGoogle Scholar
  24. 24.
    Chindriş M et al (2007) Propagation of unbalance in electric power systems. In 9th IEEE international conference on electrical power quality and utilization, pp 1–5Google Scholar
  25. 25.
    Jong-Gyeum K, Eun-Woong L, Dong-Ju L, Jong-Han L (2005) Comparison of voltage unbalance factor by line and phase voltage. In: IEEE conference on electrical machines and systems, pp 1998–2001Google Scholar
  26. 26.
    Seiphetlho T, Rens A (2010) On the assessment of voltage unbalance. In: 14th IEEE international conference on harmonics and quality of power, pp 1–6Google Scholar
  27. 27.
    IEEE recommended practice for electric power distribution for industrial plants, ANSI/IEEE Standard (December 1993)Google Scholar
  28. 28.
    Ahmed M A Haidar, Kashem M (2014) Behavioral characterization of electric vehicle charging loads in a distribution power grid through modeling of battery chargers. In: The 49th IEEE IAS annual meeting, pp 1–8 (to be presented)Google Scholar
  29. 29.
    Kwo Y, Caisheng W, Le Y, Kai S (2013) Electric vehicle battery technologies. In: Garcia-Valle R, Pecas J (eds) Electric vehicle integration into modern power network. Springer, New York, pp 15–56Google Scholar
  30. 30.
    Krieger E, Cannarella J, Arnold C (2013) A comparison of lead-acid and lithium-based battery behavior and capacity fade in off-grid renewable charging applications. Energy 60:492–500CrossRefGoogle Scholar
  31. 31.
    Sundstro O, Binding C (2010) Planning electric-drive vehicle charging under constrained grid conditions. In: The international conference on power system technology, pp 1–7Google Scholar
  32. 32.
    Ahmed MA, Haidar Al-Dabbagh M (2013) The influences of T-joint core design on the no load losses in transformers. IEEE Potentials Mag 32(3):40–48CrossRefGoogle Scholar
  33. 33.
    Woolley N, Milanovic J (2012) Statistical estimation of the source and level of voltage unbalance in distribution networks. IEEE Trans Power Deliv 27(3):1450–1460CrossRefGoogle Scholar
  34. 34.
    Vic G, Sarath P, Vic S (2002) Power quality monitoring plant investigation. Technical note, Australian Power Quality and Reliability Centre, pp 1–7Google Scholar
  35. 35.
    Jan-E-Alam Md, Kashem M, Danny S (2013) A three-phase power flow approach for integrated 3-wire mv and 4-wire multigrounded LV networks with rooftop solar PV. IEEE Trans Power Syst 28(2):1728–1737CrossRefGoogle Scholar
  36. 36.
    Hansen C, Debs A (1995) Power system state estimation using three phase models. IEEE Trans Power Syst 10(2):818–824CrossRefGoogle Scholar
  37. 37.
    Haidar AMA, Kashem M, Danny S (2014) Technical challenges for electric power industries due to grid-integrated electric vehicles in low voltage distributions: a review. Energy Convers Manag 86:689–700CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Singapore 2015

Authors and Affiliations

  1. 1.Australian Power Quality and Reliability Centre, School of Electrical, Computer and Telecommunications EngineeringUniversity of WollongongWollongongAustralia

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