Unified power flow controller (UPFC) based on chopper stabilized diode-clamped multilevel converters

As the diode-clamped, multilevel converter has been found to have attractive features for STATCOM application, there is interest in extending it to UPFC application by using multilevel converters as the series and the shunt converters. Unfortunately, as is demonstrated in this paper, the DC voltages...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2000-03, Vol.15 (2), p.258-267
Main Authors: Yiqiang Chen, Mwinyiwiwa, B., Wolanski, Z., Boon-Teck Ooi
Format: Article
Language:English
Subjects:
Automatic voltage control
Choppers
Control systems
Converters
Costs
Diodes
Direct current
Electric potential
Electrical engineering
Electronics
Load flow
Multilevel
Power system harmonics
Power transmission lines
Proposals
Ratings
Transformers
Voltage control
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Summary:As the diode-clamped, multilevel converter has been found to have attractive features for STATCOM application, there is interest in extending it to UPFC application by using multilevel converters as the series and the shunt converters. Unfortunately, as is demonstrated in this paper, the DC voltages at their DC links, are inherently unstable. Faced with this impasse, a solution is sought in a system of local feedback controlled Class B choppers to equalize the DC. A laboratory experimental model establishes the feasibility of the proposal. Digital simulations show that current ratings in the choppers need be only 10% of the current ratings in the converters. The chopper cost is estimated as 1% of the cost of the multilevel converters.
ISSN:0885-8993
1941-0107
DOI:10.1109/63.838098