ISSN : 1796-203X
Volume : 4    Issue : 7    Date : July 2009

A New Signal Processing based Method for Reactive Power Measurements
Adalet Abiyev
Page(s): 623-630
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A new modified Walsh function (WF) based method for the measurement of reactive power (RP)
under both sinusoidal and non-sinusoidal conditions is proposed and investigated. Proposed
method simplifies the multiplication procedure to evaluate the reactive components from
instantaneous power signal using peculiar properties of the WF. One of the advantages of
proposed measurement approach is that in contrast to the known existing methods which involve
phase shift operation of the input signal, the proposed technique does not require the time delay of
the current signal to the 2 / π with respect to the voltage signal. Another advantage is related to the
computational saving properties of the proposed approach coming from use of the Walsh
Transform (WT) based signal processing method. Proposed method eliminates an influence of the
prevalent third order current harmonic to and reduces the effect of the highest order current
harmonics on the RP measurement results. The examples are used to illustrate validity and
effectiveness of the suggested method for evaluation of the RP. A new method has been tested by
use of a simulation tools developed on the base of “Matlab”.

Index Terms
reactive power measurement, distortion power, Walsh function, current harmonics