Precision Measurement of Power Harmonics and Flicker

Measuring flicker with discrete fourier transform

“…Method 1. The method 1, described in [2] and [3], has been first developed by Budovsky and duplicated at LNE. Advantage is taken of the internal delay function of the DVM to align the measurement window with the peak of U M .…”

New approach for the determination of the characteristics of signals containing fluctuating harmonics

“…Many papers have also been published on flicker which is a slow and repetitive variation of the voltage and constitute an indicator of the quality degradation of the power grid. One method consists in measuring each minimum and maximum of the modulated signal in the time domain using a high precision digital voltmeter [5,6]. The modulation depth can also be determined by using two digital voltmeters (DVMs) and digital logic and software control that ensures that the modulated signals are only measured when either maximum or minimum modulation occurs [7].…”

“…AcCorrespondence: andre.poletaeff@lne.fr curate measurements of such signals have also generated the need for new calibration methods for harmonic analysers. The case of stationary harmonics has already been widely studied [5,10]. Characterisation of fluctuating harmonics requires more complex signal analysis methods.…”

Metrological characterisation of power quality measurement stations: a case study

“…As an example, high-resolution is required to measure stationary harmonics, while a continuous long time monitoring is required to measure fluctuating harmonics (Melhorn and McGranaghan, 1995;Khan, 2001;Budovsky and Hammond, 2005). In some cases, inexpensive devices that measure voltages and currents a few times a second may face up to the needs, while some applications require very high-speed measurements, i.e., when high frequency transients must be revealed.…”