Steady-State Stability Analysis of Shaft Torsional Oscillation in AC-DC Interconnected System with Self-Commutated Converters

摘要

Recent progress of power electronics technology makes it possible that self-commutated converter using GTOs (Gate Turn-Off thyristors) is considered to be applied to HVDC transmission systems. Since the self-commutated converter can be operated stably without depending on ac-side voltage, the magnetude and the phase angle of the converter output voltage can be controlled independently. Therefore, this type of converter will improve the voltage stability at its ac side.