Model of ΔV10-meter signal chain for periodic voltage fluctuation

ΔV10 index, proposed by the Japanese CRIEPI Institute and used all over the Far East countries, is a measure of voltage fluctuations in power grids. European standards prefer Pst and Plt indicators for measuring voltage fluctuations. ΔV10 index is an alternative to these indicators to measure flicker severity caused by voltage fluctuations. ΔV10 and Pst/Plt differ in terms of the characteristics of their measurement signal chains and may, therefore, be characterized by different diagnostic capabilities. The paper describes the definition of ΔV10 index and proposes a block diagram for the index meter, based on the structure of a flickermeter. Besides, it presents the equation that models the meter's signal chain for voltage variation, which could be reconstructed through amplitude modulation with periodic signal. The dependency of ΔV10 index on the frequency of the modulating signal has been depicted. The values of ΔV10 and Pst indexes for equal voltage variations have been compared. Laboratory results have also been presented to enable assessment of the ΔV10 index model for its dependability. A quantified relation between these indexes for selected shapes of a modulating signal has been defined, which establishes the possibility of converting one measure into the other for voltage fluctuations, reproducible through amplitude modulation with periodic signal.