Voltage Main Harmonic Level Influence on Harmonic Current Emission Modeling

This paper presents an experimental evaluation on the load current harmonic sensitivity to supply voltage main component level. While most often, the current harmonic model components are presented as constants regardless of U
1
level, the measurements indicate that the role of the U
1
is significant and needs attention. Large experimental result set is used in this paper to describe the possible modeling approach for the U
1
inclusion. Empirical trends of the measurement outcome indicate that a linear relation towards the relative U
1
level is justified to represent the load current harmonics dependence. A waveform variation-dependent model (WVDM) for load current harmonics is further elaborated to provide a U
1
dependent part.