Challenges in Estimating Amplification of Background Harmonic Voltage Distortion

Harmonic distortion in power systems can arise in two main forms: active emissions from disturbing connections and modification of existing harmonics caused by resonance between the grid and any external impedance introduced into the network. Active emissions are typically assessed by applying Ohm’s law at different frequencies using a system model at the point of interconnection, which provides a straightforward way to estimate distortion levels.