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Maritime Link

HVDC Light® facilitate integration of renewable energy and stabilize the electrical grid in northern Canada

NSP Maritime Link Inc., a part of Emera Inc, awarded Hitachi Energy a contract to supply the HVDC Light® solution creating the first electricity link between the island of Newfoundland and North America.

The Maritime Link Project is a 500 MW high-voltage direct current (HVDC) connection that  enables clean, renewable electricity generated in Newfoundland and Labrador to be transmitted to the North American grid in Nova Scotia. The stabilizing features of Hitachi Energy HVDC Light® solution also allow Nova Scotia to integrate additional renewables and contribute to Canada’s emission-reduction efforts.

The HVDC Light® Maritime Link is the first of its kind in the world with a full Voltage Source Converter (VSC) bipolar configuration, to enhance system availability. The converter stations are equipped with the advanced MACH control and protection system which acts like the brain of the HVDC link. It monitors, controls and protects the system and manages thousands of operations to ensure power reliability. Its advanced fault registration and remote-control functions is also helping to protect the link from unexpected disruptions, such as lightning strikes.

In addition to the two converter stations for the ±200 kV HVDC link, the project scope also included two 230 kV AC substations in Newfoundland, one 345 kV AC substation in Nova Scotia and two cable transition stations.

Main data
Commissioning year: 2019
Power rating: 500 MW 
No. of poles: 2
AC voltage: Newfoundland side: 230 kV
Nova Scotia side: 345 kV
DC voltage: ±200 kV 
Length of overhead DC line: 187 km
Length of DC submarine cable: 170 km
Length of DC underground cable: 1 km
Main reason for choosing HVDC: Long distance, stabilizing features
Application: Connecting remote generation and interconnecting grids