has been awarded an order for a high-voltage direct current (HVDC) transmission
system to connect the British and Belgian national grids via subsea cable.
Siemens will be responsible for the turnkey installation of both converter
stations using HVDC Plus technology with a transmission voltage of ±400
kilovolt (kV) DC. Customer is
Nemo Link, a joined venture between
the British grid operator National Grid and Belgian Transmission System
Operator Elia Group, who together have founded this joint project. After
its completion, Nemo
Link will provide 1,000 megawatt (MW) of
capacity, enough to power 500,000 households. The link will run 140 kilometers
(km) between Richborough on the Kent coast and Zeebrugge near the city
of Brugge with a combination of subsea and underground cables. Commercial
operation of the link is scheduled for 2019. The contract also includes
a service and maintenance agreement for a period of five years.
"We are very pleased to be working with Nemo Link on another landmark
HVDC project that will support the integration of the European energy market,"
said Tim Dawidowsky, CEO of the Transmission Solutions Business Unit
within Siemens Energy Management Division. "Siemens is a world
leader in high-voltage direct current transmission and has installed projects
using its HVDC Plus technology with a total capacity of 4.6 Gigawatt worldwide."
Link has been designated as one of the European
Commission's projects of common interest to help create an integrated European
Union energy market. It will increase energy security in both countries
and support the integration of renewable energy like offshore generated
Using subsea cables Nemo
Link will connect two high-voltage alternating
current (HVAC) electricity systems separated by the North Sea. The utilization
of HVDC avoids the need to synchronize the two interconnected AC networks.
Both converter stations will be using HVDC Plus voltage-sourced converters
in a modular multilevel converter arrangement (VSC-MMC) that convert AC
to DC and DC back to AC on the other side of the link. In contrast to line-commutated
converter technology, the HVDC Plus system works with power transistors
that can be also switched off (IGBT), enabling the commutation processes
in the power converter to run independently of the grid voltage. The very
fast control and protective intervention capabilities of the power converters
provides a high level of stability in the transmission system, which primarily
serves to reduce grid faults and disturbances in the three-phase AC network.
This significantly increases supply reliability for utility companies and
Siemens HVDC Plus technology allows efficient transportation of electrical
power over large distances and in particular for subsea applications with
losses of around two percent excluding cable losses. It is also highly
controllable and brings operational benefits to both transmission systems.
Nemo Link interconnector will allow power
to flow in both directions and will be the third electricity connection
between UK and Europe. The 1,000-MW-interconnector BritNed between UK and
the Netherlands was also developed by Siemens and went into operation in
Interconnectors play a crucial role in the European Union's strategy to
achieve a competitive and integrated European energy market. By allowing
the UK and Belgium to trade power, the Nemo
Link interconnector will increase security
and diversify both countries' electricity supply. To meet international
and domestic renewable and climate change targets, the UK and Belgium will
generate more power from renewable sources, including offshore wind. By
its nature, wind power generation is intermittent and interconnectors provide
an effective way to manage these fluctuations in supply and demand.
the Nemo Link interconnector on our site HERE.