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Greenlink will use high voltage direct current voltage source converter (HVDC VSC) technology to link the two power systems. HVDC has been selected over an AC connection, because AC is technically difficult over this distance. HVDC has lower unit costs, can be much more easily controlled according to trading and market requirements, and has much lower losses. The VSC technology (as compared to older current source converters) requires less reinforcement to the AC grid at the connection points, as well as allowing very rapid change of flow direction and reactive power, which is valuable to system operators when managing grid stability and in providing ancillary/system services.