Compensated synchronous PI current controller in overmodulationrange and six-step operation of space-vector-modulation-basedvector-controlled drives
Khambadkone, A.M.
Holtz, J.
Nat. Univ. of Singapore;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Jun 2002
Volume: 49,
Issue: 3
On page(s): 574-580
ISSN: 0278-0046
References Cited: 10
CODEN: ITIED6
INSPEC Accession Number: 7295793
Digital Object Identifier: 10.1109/TIE.2002.1005382
Current Version Published: 2002-08-07
Abstract
Overmodulation enhances the power utilization of the installed
capacity of a voltage-source inverter. A space-vector strategy is used
for constant-switching-frequency inverters. In order to achieve the
overmodulation, a modified reference signal with nonuniform angular
velocity is generated using a preprocessor. Such a reference wave
produces low-frequency harmonics in currents. The presence of current
harmonics restricts the bandwidth of the synchronous proportional plus
integral current controller in the overmodulation range. A compensating
current control is presented to allow for high-bandwidth current control
in synchronous coordinates during overmodulation and six-step. The
proposed scheme allows for an easy upgrade of a conventional vector
control scheme to include overmodulation and, thus, reduce the
design-to-market time
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