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

Author

Chen, Yiqiang ; Mwinyiwiwa, Bakari ; Wolanski, Zbigniew ; Ooi, Boon-Teck

Author_Institution

Dept. of Electr. Eng., McGill Univ., Montreal, Que., Canada

Volume

15

Issue

2

fYear

2000

fDate

3/1/2000 12:00:00 AM

Firstpage

258

Lastpage

267

Abstract

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

Keywords

choppers (circuits); feedback; load flow control; power semiconductor diodes; static VAr compensators; DC links; DC voltages; STATCOM; UPFC; chopper cost; chopper stabilized diode-clamped multilevel converters; current ratings; digital simulations; laboratory experimental model; local feedback controlled Class B choppers; multilevel converters; series converters; shunt converters; unified power flow controller; Automatic voltage control; Choppers; Control systems; Costs; Diodes; Load flow; Power system harmonics; Power transmission lines; Transformers; Voltage control;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.838098

Filename

838098