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Synchronized measurements and power quality assesment

In this paper, experimental results obtained with two different types of measurement equipment are presented comparatively. One type of equipment is dedicated to power quality monitoring, while the second one is a phasor measurement unit with a supplementary module intended to be used to determine some power quality parameters. Experiments were designed as to emulate different power quality levels in LV office typical networks, in what concerns unbalance and harmonic distortion of voltage and current waveforms. All results have been compared with a focus on the rms values of the currents measured by the two types of equipment. Data from the phasor measurement unit were aggregated before this comparison was made in order to mitigate the potential inadvertences introduced by the different reporting rates of the two devices. Special attention has been paid to frequency measurement as well, considering its importance in emerging grids.