The market penetration of large single-phase residential harmonic loads, including electric vehicle (EV) battery chargers of 6.6 kW, is a potential power quality and power delivery concern for electic power providers and consumers. Charging systems with high harmonic current distortion can potentially result in secondary distribution line and transformer de-rating or quality of service consequences. This paper reports on the main findings of a project that examined the secondary (customer-side) distribution harmonic impacts of residential harmonic loads, with and without EV charging. Simulations as well as actual field test site &@ to determine the impact of residentird single phase loads and EV charging systems on the secondary of the distribution trrmsfonner, show that e Commercial EV chargers engineered to National Electric Vehicle Infrastructure Working Council (IWC) guidelines based upon IEC 1000-34, do not give rise to excessive voltage THD on the secondary of the tmnsfonner ● The rise in voltage THD due to EV charging is less than 0.8% in all three field test sites and should not be a cause for concern. Load management strategies like off-peak charging should be encouraged to minimize the impacts on the distribution system.
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