Operational mechanism and characteristics analysis of voltage source AC/DC converters

Conventional HVDC is built around the thyristor converter which requires line_commutation and thus has some inherent shortcomings.Rapid development of power electronic devices with turn off capability like IGBT and GTO makes the Voltage Source Converter VSC more and more attractive for HVDC application.With ideal control and operational characteristics,perfect output waveforms and flexible operation,VSC will have promising applications.This paper presents mechanism of HVDC based on VSC and its operational and control characteristics.