Interactive Transmission Network Planning Using a Least-Effort Criterion

This paper describes an interactive software tool for long term transmission system expansion planning. All network synthesis is based on the DC power-flow model. The ranking of new additions is based on a "least-effort" criterion that takes into account the pattern of flow distribution in the network. An automatic network synthesis algorithm can be used for static studies. The reinforcement criterion is based on the cost/benefit analysis of "least-effort paths" in the network. Disconnected buses are conveniently handled by the superposition of a dummy network with very low transmission capacity over the actual network. Sensitivity analysis is extensively used. The program has been implemented in the transmission departmentof ELETROBRAS (the holding company of the Brazilian electric sector). Three case studies are presented and discussed.