Measurement framework for the consistent and fast measurement of conducted grid emissions in the 9-500 kHz range

Abstract

There is currently no standardized measurement framework for the characterization of conducted emissions in the low-voltage grid for the 9–500 kHz range. Several methods are proposed for the 9–150 kHz band in power quality standards, while the only method defined for the 150–500 kHz range is not designed for power quality measurements. The different configuration of the existing methods prevents consistency of results in the entire band.

This work analyzes drawbacks of the current standardized methods and summarizes the recently published research methods, to propose a measurement framework for the characterization of conducted emissions in the 9–500 kHz range. This framework solves the identified drawbacks by proposing a set of six measurement methods to obtain different metrics for consistent results in the whole range. For that, the use of a common method for obtaining root-mean-square values in the entire 9–500 kHz range is proposed to assess aggregated values and quasi-peak (QP) outputs. Two novel techniques (Approximated-QP and Conservative-QP) are also defined to cover the existing gap in the literature in the estimation of the QP spectra in the 150–500 kHz band. The measurement framework includes a time-frequency domain analysis method to detect and characterize impulsive emissions.