Influence Of The Thermal Limits Of Transmission Lines In The Economic Dispatch

In electrical systems, one of the main factors that limits the energy transport is the temperature of the conductor. Knowing the transmission system, its lines, the critical sections and the climate of the region where they are located, the real temperature of the conductor can be calculated, providing, in determined conditions, an increase of the transmission capacity, without compromising the operational security. Since on the project of the transmission line, its capacity is based on very conservative estimates, an overloaded line could cause at some moments, an unnecessary alteration in the dispatch of the generators and in other controls of the system. Making na hourly forecast of the real transmission capacity and using the favorable periods to make the economic dispatch, a significant economy in the generation cost, without violating of the maximum temperature of the transmission line, can be gotten. ©2006 IEEE.NBR5422 - Projeto de Linhas Aéreas de Transmissão de Energia Elétrica - Procedimento - COBEI/ABNT, Março, 1985Força Tarefa Conjunta de Ampacidade Estatística GCPS/GCOI. Critérios e procedimentos para o cálculo da ampacidade estatística de linhas aéreas de transmissão com cabos alumínio-aço (Etapa 2), Brasil, Agosto de 1993Douglas,D.A., Motlis,Y., Seppa,T. IEEE's Aproach for Increasing Transmission Line Rating in North America. CIGRÉ, Art. 22-048, France, 2000Seppa, T., Douglas, D.A., Safe Weather Assumptions for Line Ratings (2001) Electrical World, , T&D, Jan-FebCabetas, J., et alli, Advances in the estimation of dynamic line ratings (1996) CIGRÉ, SessionGRANVILLE, S., Optimal reactive dispatch through interior point methods (1994) IEEE Transactions on Power Systems, 9 (1). , FebMorgan, V.T., The Current Carrying Capacities of Overhead Line Conductors (1978) IEEE - Summer Power MeetingNascimento, C.A.M., Brito, J.M.C., Filho, E.B.G., Braga, G.E., Miranda, G.C., Bracarense, A.Q., Ueda, S., The State of the Art for Increased Overhead Line Ampacity Utilizing New Technologies and Statistical Criteria (2004) Transmission and Distribution Conference and Exposition: Latin America, pp. 464-469. , IEEE/PES, 8-11 Nov, PagesStephen, R., Description of State of the Art Methods to Determine Thermal Rating of Lines in Real-Time and Their Application in Optimising Power Flow, pp. SC22-WG12. , Electrical Aspects of Overhead LinesGabaglia, C.P.R., Silva Filho, J.I., Moreira, F.S. Ampacidade Estatística - Medições em Laboratório e de Campo. XVIII SNPTEE, Curitiba (PR), 2005Deb, A., Power, K., (2000) Line Ampacity System-Theory, Modeling, and Applications, , Boca Raton, FL: CR