Title :
STATCOM based on multimodules of multilevel converters under multiple regulation feedback control
Author :
Chen, Yiqiang ; Ooi, Boon-Teck
Author_Institution :
Flairbase Inc., Montreal, Que., Canada
fDate :
9/1/1999 12:00:00 AM
Abstract :
This paper describes a STATCOM based on diode-damped multilevel power converters. The current rating is increased by parallel connections of multiple power converter modules. The gate-turn-off thyristor (GTO) switching angles of the fundamental switching strategy are exploited in the design to accomplish three objectives: (1) low total harmonic distortion (THD) in voltages and currents; (2) equal sharing of the currents in the individual modules; and (3) direct control of AC voltage magnitude. Three proportional-integral (PI) feedback loops are employed for the purposes of: (1) regulating the total DC voltages and ensuring the quadrature relationship of the AC currents and voltages; (2) regulating the reactive power drawn by the STATCOM; and (3) equalizing the DC capacitor voltages in all the levels
Keywords :
AC-DC power convertors; feedback; power semiconductor switches; rectifying circuits; static VAr compensators; switching circuits; thyristor convertors; two-term control; voltage control; AC voltage magnitude; DC capacitor voltages; GTO switching angles; PI feedback loops; STATCOM; current rating; diode-damped multilevel power converters; direct control; fundamental switching strategy; multiple regulation feedback control; parallel connections; total harmonic distortion; Automatic voltage control; Capacitors; Feedback control; Flexible AC transmission systems; Laboratories; Power harmonic filters; Research and development; Switches; Testing; Thyristors;
Journal_Title :
Power Electronics, IEEE Transactions on
