A Review Article of SAF based Transmission System

Line commuted converter user in SAF (Shunt Active Filter) transmission systems inject harmonics into their associated AC and DC systems. A conventional approach to filter these harmonics is to use passive filters on both AC and DC sides of the converter. Apart from their technical problems, harmonic filters constitute a considerable part of the volume and cost of present DC terminal stations. Another possible alternative of harmonic suppression is to increase the number of pulses of AC-DC converters by transformer phase-shifting techniques, but the resulting complicated circuitry together with its problems of insulation produce significant technical and economical disadvantages. This Paper presents an overview of classical SAF transmission system. It also provides a brief historical development of the technology and state of art in the field of SAF transmission system. Based on outcome of literature survey, broad research goals are identified.