Abstract
PMU (Phasor Measurement Unit) data are being increasingly used to identify grid power quality phenomena. This paper discusses how the dynamic compliance tests prescribed by the IEEE Standard for Synchrophasor Measurements for Power Systems could provide metrological reliability to evaluate voltage sags with PMU data. A PMU calibration system being developed at INMETRO is used to measure amplitude modulation and voltage sags under low modulation indexes and slow voltage variations. The voltage signals are generated by a Power Quality calibrator used as a voltage source and conditioned by a resistive voltage divider before being acquired by a digital voltmeter. To estimate the voltage signal phasors at each time stamp, an iterative algorithm is applied to some fitness functions after the digital sampling. The results could be used as reference values, so they can be compared with the PMU values to determine the PMU errors.
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