Abstract
Power quality assessment is a complex measurement task, requiring the usage of a system with suitable metrological properties. This complex measurement task in the real power grid is performed with the use of power quality analysers that measure and record the parameters determining the power quality. The paper presents selected research results for a class A power quality analyser in the specially prepared measurement system containing measuring instruments calibrated by the Main Office of Measures. The measurement results were completed with a presentation of the uncertainty budget. The influence of the phenomenon of spectrum leakage on metrological properties of the tested power quality analyser was considered in the paper. To assess this influence, the simulation studies with the use of MATLAB and the experimental studies were carried out for selected test signals. The Metrological interpretation of the research results is presented in the paper.
Highlights
To assess power quality, we use a set of standard and complementary quantities contained in documents [1,2]
The metrological analysis of obtained measurement results allowed for the drawing of final conclusions
The proposed approach and the prepared measurement stand enable the testing of power quality analysers, considering the phenomenon of “spectrum leakage” and can be used for serial testing of the accuracy of harmonics measurements with different power quality analysers by the institutions associated with measurements and technical inspections
Summary
We use a set of standard and complementary quantities contained in documents [1,2]. Incorrect adjustment of the measurement window is a situation in which the duration of the measurement window is not a total multiple of the fundamental period of the measured signal These measures of harmonic content, as well as other quantities used in power quality assessment, are measured with power quality analysers. The carried-out research allowed for the metrological assessment of the effect of the spectral leakage phenomenon on the measurement of harmonic content by the class A power quality analyser. The original contributions of the paper include the metrological assessment of the content of higher harmonics measurement accuracy by class A power quality analysers with the use of a proprietary measuring stand containing instruments calibrated by the Main Office of Measures. The proposed approach and the prepared measurement stand enable the testing of power quality analysers, considering the phenomenon of “spectrum leakage” and can be used for serial testing of the accuracy of harmonics measurements with different power quality analysers by the institutions associated with measurements and technical inspections
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