Estimating the net harmonic currents produced by selected distributed single-phase loads: computers, televisions, and incandescent light dimmers

Individually, single-phase power electronic-based loads pose no problem to power systems. In total, however, they have the potential to raise harmonic voltages and currents to unacceptably high levels. The purpose of this paper is to give guidelines for modeling the net harmonics currents produced by these loads, and to describe the following two key factors used to determine the guidelines: harmonic current cancellation due to phase angle diversity, and attenuation due to system impedance and the corresponding voltage distortion that tend to reduce the net harmonic currents produced by these loads.