|
Power
measurement using the wavelet transform |
|
Weon-Ki
Yoon; Devaney, M.J. |
|
Instrumentation
and Measurement, IEEE Transactions on , Volume: 47 Issue: 5 , Oct. |
|
This
paper provides the theoretical basis for and demonstrates the practical
application of |
|
power/energy
and rms measurements directly from the wavelet transform data associated |
|
with
each voltage current element pair. The advantage of using the wavelet
transform |
|
data
directly is that it provides the distribution of the power and energy with
respect to the |
|
individual
frequency bands associated with each level of the wavelet analysis.
Frequency |
|
separation
into the various wavelet levels is achieved using IIR filters because
their |
|
magnitude
characteristics are much better than typical FIR filters of equivalent |
|
complexity.
The IIR polyphase network strategy yields a simpler wavelet filter bank |
|
Reactive
power measurement using the wavelet transform |
|
Weon-Ki
Yoon; Devaney, M.J. |
|
Instrumentation
and Measurement, IEEE Transactions on , Volume: 49 Issue: 2 , April |
|
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/spl
deg/ |
|
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 |
|
Wavelet
packet transform for RMS values and power measurements |
|
Hamid,
E.Y.; Kawasaki, Z.-I. |
|
IEEE
Power Engineering Review , Volume: 21 Issue: 9 , Sept. 2001 |
|
This
paper proposes an approach based on wavelet packet transform (WPT) for
root |
|
mean
square (RMS) values of voltage and power measurements. The algorithm can |
|
simultaneously
measure the distribution of the RMS of voltage or current and power with |
|
respect
to individual frequency bands from the wavelet coefficients associated
with each |
|
voltage
current pair. The advantage of the WPT is that it can decompose a power
system |
|
waveform
into uniform frequency bands, which are important for identification of |
|
harmonic
components and measurement of harmonic parameters. The algorithm is |
|
validated
using simulated waveforms. |
|
