Abstract
HVDC system with self-commutated converter can greatly improve overall AC-DC system performance in comparison with conventional line-commutated HVDC system. It is realized by a capability of controlling active and reactive power independently. This paper first presents a comprehensive P-Q control scheme of self-commutated HVDC system for overall stability improvement. Its effect on transmission capability enhancement has been evaluated through stability simulation study using a model system which typically represents large interconnected power system. Transient converter control required to ensure HVDC system stable operation is also discussed.
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