Waveform Variation Defined Model for Harmonic Current Emissions Including Cross-Order Supply Voltage Harmonics Influence

Abstract

The paper reports an experimental non-linear load evaluation regarding current harmonics sensitivity to supply voltage harmonics. A base for the model is proposed relying on the time-domain waveform variations, rather than impedance or conductance approach. The proposed Waveform Variation Defined Model is able to detail to provide improved correspondence for the actual load physical operation on the emergence of cross-order coupling between the supply voltage and current harmonics variations. Model proposal specifies to implement non-impedance relation and separated phase and magnitude response components, in empirical outcome of the voltage-to-current harmonic variation relation. It will be shown that the model proposed is able to provide an accurate estimation on cumulative influence of different supply voltage harmonics included, for the most probable supply voltage harmonics in the residential grid, for the low order odd harmonics. Model results present outstanding match of the harmonic voltage influence estimations on the load current harmonics levels measured, phase and magnitude values included.

Keywords

• Power quality
• current harmonic addition
• harmonic estimation
• harmonic sensitivity