%0 Conference Paper %B IX Congreso Latino-Iberoamericano de Investigación Operativa %D 1998 %T Short-Term Hydrothermal Coordination by Augmented Lagrangean Relaxation: a new Multiplier Updating %A Beltran, C %A Heredia, F J %C Buenos Aires, Argentina %K augmented lagrangian relaxation; radar subgradient method; generalized unit commitment; research %X Augmented Lagrangean Relaxation Method (ALRM) is one of the most powerfull technique to solve the Short­Term Hydrothermal Coordination Problem (STHC Problem ). A crucial step when using the ALR Method is the multipliers updating. In this paper we present an efficient new multiplier updating procedure: the Gradient Method with Radar Step. The method has been successfully tested solving large ­scale exemples of the STHC Problem %8 31-4/08/98 %9 Contributed oral presentation