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Reactive power measurement using the wavelet transform

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2 Author(s)
Weon-Ki Yoon ; Digital Power Instrum. Group, Missouri Univ., Columbia, MO, USA ; Devaney, M.J.

This paper provides the theoretical basis for the measurement of reactive and distortion powers from the wavelet transforms. The measurement of reactive power relies on the use of broad-band phase-shift networks to create concurrent in-phase currents and quadrature voltages. The wavelet real power computation resulting from these 90° phase-shift networks yields the reactive power associated with each wavelet frequency level or subband. The distortion power at each wavelet subband is then derived from the real, reactive and apparent powers of the subband, where the apparent power is the product of the v, i element pair's subband rms voltage and current. The advantage of viewing the real and reactive powers. In the wavelet domain is that the domain preserves both the frequency and time relationship of these powers. In addition, the reactive power associated with each wavelet subband is a signed quantity and thus has a direction associated with it. This permits tracking the reactive power flow in each subband through the power system

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:49 ,  Issue: 2 )

Date of Publication:

Apr 2000

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