JWG C4/B4/C1.604 Influence of Embedded HVDC Transmission on System Security and AC Network Performance


This JWG will draw from previous work done on HVDC systems in CIGRE in the areas of application of HVDC in low short circuit capacity areas, use of DC converters for reactive power control, commutation failure of HVDC, guide for upgrading transmission systems with HVDC transmission, economic assessment of HVDC links, voltage and power stability in AC/DC systems, and systems with multi DC infeed. This JWG will take the work further in the area of the interactions with the power system.

The use of HVDC between regions of an AC network is being considered to an increasing extent because of the growing challenge of network development. HVDC may be considered if a long overhead line or cable connection is necessary, or because the conversion of an existing AC line to HVDC operation can achieve increased transfer capacity. Difficulties with building new overhead lines lead more and more to considering underground HVDC connections inside AC networks operating in parallel with AC lines. In addition, with the advent of off-shore wind generation, HVDC submarine cables are often the most suitable option, particularly for long distances under water.  However, HVDC connections perform differently to AC connections during steady state, dynamic and transient conditions, and it would be useful for CIGRE to clearly identify these differences. The coordination between HVDC links and AC lines in parallel should be studied to enhance the understanding in the industry for the most effective utilization of these assets in transmission networks.

Convener: S. Henry (France)

Publication: TB536: Influence of Embedded HVDC Transmission on System Security and AC Network Performance (Published: 2013-04)