Project: Lower Churchill HVDC Project
Service: LCC HVDC
Year: Our involvement began first back in 2007, and is currently on-going
The Lower Churchill HVDC project is a 900 MW point-to-point LCC HVDC link connecting Labrador to Newfoundland Island in Canada. In the early stages of the project, it was originally planned to be a 3-terminal LCC HVDC link, and TGS performed a significant amount of studies for the 3-terminal option of the project. Later, it was decided it would be only a 2-terminal HVDC link. Currently, TGS is providing equipment-related services, as well as system support services, to Nalcor for this 2-terminal HVDC project. Additionally, TGS is a member of the technical integration committee, which is overseeing the successful integration of the Lower Churchill HVDC link, the nearby Maritime VSC link, three new synchronous condensers and a new 230 kV HVAC link on the Newfoundland Island.
This project is was challenging in that due to its importance to the island and the unique geography and transmission line route, it required a 2pu overload (per pole), a 400km electrode and a cable switching scheme to allow uninterrupted transmission in the event of a contingency.