Development of Control System for High-Performance Self-Commutated AC/DC Converter

Abstract

This paper describes a cooperative control scheme for a dc two-terminal system consisting of voltage-source self-commutated converters. Using this scheme, each terminal can be operated independently, with little data communication. Prototype controllers have also been developed and tested with an analogue power system simulator. The test results have verified that:
(1) The converter will not fail to carry out commutation even when a voltage dip or waveform distortion has occurred in the ac system.
(2) Active and reactive power can be controlled without interference.
(3) In the event of terminal tripping-out as well, the healthy terminal can continue operation without depending on any means of communication between terminals.