Delayless method to generate current reference for active filters
Valiviita, S.
Ovaska, S.J.
Inst. of Intelligent Power Electron., Helsinki Univ. of Technol., Espoo;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Aug 1998
Volume: 45,
Issue: 4
On page(s): 559-567
ISSN: 0278-0046
References Cited: 13
CODEN: ITIED6
INSPEC Accession Number: 6000781
Digital Object Identifier: 10.1109/41.704882
Current Version Published: 2002-08-06
Abstract
Active power filters are used to eliminate AC harmonic currents by
injecting equal but opposite compensating currents. Successful control
of active filters requires, among other things, an accurate current
reference. In this paper, we introduce a multistage adaptive filtering
system which generates the current reference delaylessly and accurately.
Our filter structure combines a low-pass prefilter and an adaptive
predictive filter, making it possible to extract the sinusoidal active
current from the distorted waveform without harmful phase shift, even
when the frequency and amplitude alter simultaneously. Although active
filters are typically used to compensate for the supply harmonics, where
the fundamental frequency remains almost constant, we will show that our
filter structure can also be applied in applications where the frequency
alters rapidly
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