Virtual Instrumentation for Time-Domain Active and Reactive Power Measurement and Compensation in Industrial Networks

Florin Sandu, Iuliu Szekely, Wilibald Szabo, Gheorghe Scutaru

Abstract

The authors implemented power measurement methods in non-sinusoidal regime using an original in-time signal processing: the temporal active power formula, applied to a pair of periodic signals representing voltage and current can be applied also to current (as it is) and Hilbert transform of voltage (kept in time domain) to compute the reactive power. The suggested algorithms were oriented towards digital signal acquisition and processing; their efficiency was compared with traditional methods and also with the implementation alternatives. Sampling rate was synchronized with the signal, as most industrial power meters don’t require a time reference (the power values are normalized to the period of the signal). The virtual instruments accomplished are directly applicable in real time monitoring and reactive power compensation for non-sinusoidal regime using recent developments in the technology of capacitors.

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IMEKO-TC4-2007-173.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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