Directlink
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Directlink is a high voltage direct current transmission line between Mullumbimby and Bungalora in Australia, used to trade power between New South Wales and Queensland. Directlink, built in 2000, is a 59-km bipolar HVDC cable route, implemented for environmental protection reasons as underground cables.
The system has three static inverters at each terminal, and three pairs of bipolar transmission cables. Each pair of cables operates at +/- 84 kV and transmits 60 MW, so the total rating of the project is 180 MW minus transmission losses. The history of DirectLink power imports shows that all three poles cannot be guaranteed to operate simulatenously.
HVDC was chosen for this project for reasons of low environmental impact of the transmission line, and the ability of the IGBT transistor converter stations at each end to accurately control both real and reactive power. Individual water-cooled IGBT modules are rated at 2.5 kV and 500 A, with multiple units connected in series to achieve the required voltage rating.
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