  The modern power grid has seen a rise in the integration of non-linear loads,
presenting a significant concern for operators. These loads introduce unwanted
harmonics, leading to potential issues such as overheating and improper
functioning of circuit breakers. In pursuing a more sustainable grid, the
adoption of electric vehicles (EVs) and photovoltaic (PV) systems in
residential networks has increased. Understanding and examining the effects of
high-order harmonic frequencies beyond $1.5$ kHz is crucial to understanding
their impact on the operation and planning of electrical distribution systems
under varying nonlinear loading conditions. This study investigates a diverse
set of critical power electronic loads within a household modeled using
PSCAD/EMTdc, analyzing their unique harmonic spectra. This information is
utilized to run the time-series harmonic analysis program in OpenDSS on a
modified IEEE 34 bus test system model. The impact of high-order harmonics is
quantified using metrics that evaluate total harmonic distortion (THD),
transformer harmonic-driven eddy current loss component, and propagation of
harmonics from the source to the substation transformer.
