Active-forced-commutated bridge using hybrid devices for high efficiency voltage source converters

Peng Li, Stephen J. Finney, Derrick Holliday

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In high power converters, the on-state characteristics of semiconductor devices dictate its efficiency performance even if the optimized topologies are adopted. This letter proposes an active-forced-commutated (AFC) bridge that employs the hybrid power devices of thyristor and insulated-gate bipolar transistor (IGBT) to operate as a voltage source converter (VSC) or the building blocks of complex multi-stage high-voltage high-power converters. In this scheme, the thyristors are placed in the main power path that conducts for most of the fundamental period to lower the on-state losses; while the IGBT based full-bridge chainlink (FB-CL) is used for controlled (soft) transition and forced commutation of the main thyristor bridge, operating in short period. This stepped transition voltage also leads to minimized dv/dt exerted on the interfacing transformer. To coordinate the operation of these two parts, the FB stack is designed to operate in a concave polygon stepped transition (CPST) mode for the ordered turn-on and turn-off of thyristors according to different categories of commutation events. Detailed commutation analysis for the AFC-bridge is provided in this letter; also, high level discussions and simulation results are presented to demonstrate its potential technical merits.
LanguageEnglish
Pages2485-2489
Number of pages5
JournalIEEE Transactions on Power Electronics
Volume32
Issue number4
Early online date14 Nov 2016
DOIs
Publication statusPublished - 30 Apr 2017

Fingerprint

Thyristors
Electric commutation
Insulated gate bipolar transistors (IGBT)
Electric potential
Power converters
Semiconductor devices
Topology

Keywords

  • voltage source converter
  • hybrid device
  • thyristor
  • IGBT
  • high efficiency
  • controlled transition
  • active-forced-commutation

Cite this

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abstract = "In high power converters, the on-state characteristics of semiconductor devices dictate its efficiency performance even if the optimized topologies are adopted. This letter proposes an active-forced-commutated (AFC) bridge that employs the hybrid power devices of thyristor and insulated-gate bipolar transistor (IGBT) to operate as a voltage source converter (VSC) or the building blocks of complex multi-stage high-voltage high-power converters. In this scheme, the thyristors are placed in the main power path that conducts for most of the fundamental period to lower the on-state losses; while the IGBT based full-bridge chainlink (FB-CL) is used for controlled (soft) transition and forced commutation of the main thyristor bridge, operating in short period. This stepped transition voltage also leads to minimized dv/dt exerted on the interfacing transformer. To coordinate the operation of these two parts, the FB stack is designed to operate in a concave polygon stepped transition (CPST) mode for the ordered turn-on and turn-off of thyristors according to different categories of commutation events. Detailed commutation analysis for the AFC-bridge is provided in this letter; also, high level discussions and simulation results are presented to demonstrate its potential technical merits.",
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Active-forced-commutated bridge using hybrid devices for high efficiency voltage source converters. / Li, Peng; Finney, Stephen J.; Holliday, Derrick.

In: IEEE Transactions on Power Electronics, Vol. 32, No. 4, 30.04.2017, p. 2485-2489.

Research output: Contribution to journalArticle

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AB - In high power converters, the on-state characteristics of semiconductor devices dictate its efficiency performance even if the optimized topologies are adopted. This letter proposes an active-forced-commutated (AFC) bridge that employs the hybrid power devices of thyristor and insulated-gate bipolar transistor (IGBT) to operate as a voltage source converter (VSC) or the building blocks of complex multi-stage high-voltage high-power converters. In this scheme, the thyristors are placed in the main power path that conducts for most of the fundamental period to lower the on-state losses; while the IGBT based full-bridge chainlink (FB-CL) is used for controlled (soft) transition and forced commutation of the main thyristor bridge, operating in short period. This stepped transition voltage also leads to minimized dv/dt exerted on the interfacing transformer. To coordinate the operation of these two parts, the FB stack is designed to operate in a concave polygon stepped transition (CPST) mode for the ordered turn-on and turn-off of thyristors according to different categories of commutation events. Detailed commutation analysis for the AFC-bridge is provided in this letter; also, high level discussions and simulation results are presented to demonstrate its potential technical merits.

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