Analytical techniques for the application of static var compensators to improve the capability of long distance transmission systems to remote areas of Australia

Utilisation of Australia's diverse mineral resources located at considerable distance from developed power grids has in three recent schemes required the construction of long transmission lines, which are unsupported by nearby generation. The first is for a goldmining community over a distance of 660 km in Western Australia, replacing high cost local generation with transmitted supply. The second gives supply to a silver mining town over a similar distance in New South Wales, but requires alternative supply from the Victorian system and includes also a large static frequency converter as part of the load. The third augments an existing 700 km transmission system in Queensland, in association with supply to a single phase rail electrification project. In each case static var compensators are essential to ensure viable transmitted supply. The experience of four supply authorities, their static compensator contractors and consultants in analysing various aspects for planning and design of these systems is reported.