Modelling EVs in residential distribution grid with other nonlinear loads

Unregulated charging of electric vehicles (EVs) could impact load characteristics in distribution networks. Difficulties with power quality may appear in residential networks where the grid is weak. For providing greater capabilities to EV charging, the power quality aspects have to be considered in addition to the load increase analysis. This paper discusses the harmonic content of the EV charging load and the changing power quality indicators in the residential distribution network. Actual EV charging measurement results are presented and averaged current harmonic amplitude and phase angles values for EV charging load modelling are proposed. Results of different modelling scenarios are presented and analyzed. The results of the study showed an extensive harmonic distortion in residential load current and voltage distortion at the substation's busbar. The results pointed out in the paper can be further used for modelling the actual harmonic loads of the EVs in distribution networks.

[1]  M. Sumner,et al.  Simulation of non-linear loads for harmonic studies , 2011, 11th International Conference on Electrical Power Quality and Utilisation.

[2]  Saifur Rahman,et al.  Demand Response as a Load Shaping Tool in an Intelligent Grid With Electric Vehicles , 2011, IEEE Transactions on Smart Grid.

[3]  Matti Lehtonen,et al.  A Review of the Effects of Electric Vehicle Charging on Distribution Network Operation and Power Quality , 2013 .

[4]  G. G. Karady,et al.  Current harmonics generated by electric vehicle battery chargers , 1996, Proceedings of International Conference on Power Electronics, Drives and Energy Systems for Industrial Growth.

[5]  Peter Schegner,et al.  Impact of electrical car charging on unbalance in public low voltage grids , 2011, 11th International Conference on Electrical Power Quality and Utilisation.

[6]  J. Kilter,et al.  Residential load harmonics in distribution grid , 2013, 2013 3rd International Conference on Electric Power and Energy Conversion Systems.

[7]  Joao P. Trovao,et al.  Electric vehicles chargers characterization: Load demand and harmonic distortion , 2011, 11th International Conference on Electrical Power Quality and Utilisation.

[8]  A. Cataliotti,et al.  Theoretical and experimental comparison of total harmonic distortion factors for the evaluation of harmonic and interharmonic pollution of grid-connected photovoltaic systems , 2006, IEEE Transactions on Power Delivery.

[9]  M. Lehtonen,et al.  A review of the harmonic and unbalance effects in electrical distribution networks due to EV charging , 2013, 2013 12th International Conference on Environment and Electrical Engineering.

[10]  Matti Lehtonen,et al.  Current harmonics of EV chargers and effects of diversity to charging load current distortions in distribution networks , 2013, 2013 International Conference on Connected Vehicles and Expo (ICCVE).

[11]  Jing Yong,et al.  Modeling of Home Appliances for Power Distribution System Harmonic Analysis , 2010, IEEE Transactions on Power Delivery.

[12]  Nuno Melo,et al.  Integration of PEV in Portuguese distribution grid: Analysis of harmonic current emissions in charging points , 2011, 11th International Conference on Electrical Power Quality and Utilisation.

[13]  Ivo Palu,et al.  Harmonic levels of domestic and electrical vehicle loads in residential distribution networks , 2013, 2013 Africon.