Optimal-regulator-based control of NPC boost rectifiers for unitypower factor and reduced neutral-point-potential variations
Fukuda, S.
Matsumoto, Y.
Sagawa, A.
Div. of Syst. & Inf., Hokkaido Univ., Sapporo ;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Jun 1999
Volume: 46,
Issue: 3
On page(s): 527-534
ISSN: 0278-0046
References Cited: 9
CODEN: ITIED6
INSPEC Accession Number: 6277325
Digital Object Identifier: 10.1109/41.767059
Current Version Published: 2002-08-06
Abstract
Neutral-point-clamped pulsewidth modulation rectifiers (NPCRs) are
suitable for high-voltage systems because of their circuit structure.
The NPCRs, however, have a problem, in that the neutral point potential
(NPP) varies when the current flows into or out of the neutral point.
The variations cause voltage deviations in the input waveforms, as well
as unbalanced voltage stress on the devices. This paper describes a
controlling method for NPCRs based on a state-space model. There are
three control objectives: (1) to keep the power factor at unity; (2) to
keep the DC-link voltage at a reference value; and (3) to keep the
neutral point potential at 0 V. The neutral point current is treated as
one of the inputs. The controller is designed based on the optimal
regulator theory in order to achieve the three control objectives
simultaneously. The validity of the proposed method is demonstrated by
experimental results
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