Impacts of Modern Residential Loads on Power Grids

Modern residential loads use variable frequency drive motors and solid state electronics to improve operational efficiency and reduce energy consumption. The drawback of such energy efficient loads is the introduction of harmonics onto the local distribution grid. Elevated harmonic content due to the increased use of such devices can potentially impact residential distribution networks and adjacent customers. This paper quantifies the current harmonics generated by modern appliances, subsequently fed back to distribution grids. Multiple tests were performed using typical, commercially available appliances and results were analyzed against the IEEE-519-1992 power quality Standard. Research findings will be used to estimate harmonic content on the power grid, model future residential distribution networks and clarify the need to update the IEEE-519-1992 Standard.