Influence of Voltage Variation on the Measurement of Total Harmonic Distortion (THD) by AMI Smart Electricity Meters

Power quality parameters specified in standards IEC 61000–4–30 and EN 50160 are used to power quality evaluation in the power grid. These parameters are, among others higher harmonics and the Total Harmonic Distortion (THD). Measurement and recording of power quality parameters is carried out mainly by power quality analyzers. However, nowadays these measurements are also carried out by AMI smart electricity meters with the functionality of measuring power quality parameters. The paper presents exemplary results of THD measurement by AMI smart electricity meters and a selected class A power quality analyzer in the case of voltage variation occurrence. Metrological interpretation of the obtained results and formulations of conclusions have been presented in the paper.