Tjaereborg - an HVDC Light demonstration project for wind power

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Reactive power and voltage problems can be overcome by connecting the wind power to the grid by HVDC Light.

Tjaereborg is a demonstration project by Energinet.dk for installing and testing an 8 MVA HVDC Light transmission for the connection of a 6 MW onshore wind farm at Tjæreborg in the western part of Denmark. The 4.3 km cable link operates at 9 kV. The project was commissioned in August 2000.

Tjaereborg HVDC Light converter station

The motivation for the HVDC Light project is that the Danish power utilities are planning to install five offshore wind farms of approximately 150 MW each. Within the next 30 years, the intention is to install 4.000 MW offshore wind power plants, corresponding to 40-50 % of the total installed capacity.

Integration of huge quantities of wind power into the electrical power system may have severe consequences for that system. Fluctuating wind power production will replace the steady power production from conventional power plants, as well as their voltage control and contribution to the reactive power balance in the grid. The reactive power and voltage problems can be overcome by connecting the wind power to the grid by HVDC Light

Main data
Commissioning year:	2000
Power rating:	8 MVA / 7.2 MW
No of circuits	1
AC Voltage:	10.5 kV (both ends)
DC Voltage:	+/- 9 kV
Length of DC submarine cables:	4 x 4.3 km
Main reason for choosing HVDC Light:	Wind power. Demonstration project.