Harmonic filtering of high-power 12-pulse rectifier loads with aselective hybrid filter system
Basic, D.
Ramsden, V.S.
Muttik, P.K.
Centre for Electr. Machines & Power Electron., Univ. of Technol., Sydney, NSW;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Dec 2001
Volume: 48,
Issue: 6
On page(s): 1118-1127
ISSN: 0278-0046
References Cited: 12
CODEN: ITIED6
INSPEC Accession Number: 7122718
Digital Object Identifier: 10.1109/41.969390
Current Version Published: 2002-08-07
Abstract
Current distortion of 12-pulse rectifier loads is significantly
lower compared to six-pulse rectifier loads. However, in passive
filtering of the lowest and dominant characteristic 11th and 13th
harmonics, the use of 5th and 7th filters is often required in order to
prevent possible parallel and series resonance between the passive
filter and source impedance which can be excited by source background
distortion or by load current residual noncharacteristic harmonics at
the 5th and 7th harmonic frequencies. In hybrid filter systems, an
active filter (AF) can be added in series with the passive filter in
order to isolate the source and load. In most proposed hybrid filter
systems, AF control is based on the detection of total current
distortion and high-frequency inverters. With a selective AF control
system and voltage-controlled inverter, the AF can be controlled to
isolate the load at the critical frequencies only while at all other
frequencies the passive filter function is preserved so that lower
switching frequency and AF rating is required. In this paper, the
authors present a selective AF filter control system and simple hybrid
filter topology suitable for the compensation of high-power 12-pulse
rectifier loads. Harmonic current controllers based on the second-order
infinite-impulse response digital resonant filters are used, as they can
be considered as simple digital algorithms for more complex double
cascaded synchronous-reference-frame-based proportional plus integral
controllers. They are centered to the targeted harmonic frequencies by
using an adaptive fundamental frequency tracking filter. This approach
gives good results, even if the reference waveform (in our case, a load
voltage) is highly distorted or unbalanced and no separate phaselocked
loop is required. Test results for a laboratory model of this system and
stability analysis are presented and the importance of delay-time
compensation is discussed
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