MINIMUM LOSS PREDISPATCH MODEL FOR HYDROELECTRIC POWER-SYSTEMS

A predispatch model that minimizes generation and transmission losses on hydroelectric power systems is presented and applied to the hydroel ectric power system of COPEL, a Brazilian utility located in southern Brazil, Power loss in the generation and transmission systems is minim ized on an hourly basis throughout a day, Load demand as well as gener ation, transmission and interchange operational constraints are satisf ied. Hydroelectric generation characteristics are described in detail. Power loss in hydroelectric generation is associated with a reduction in turbine-generator efficiency and effective water head, The latter is due to an increase in tailrace elevation and penstock head loss, Po wer loss upon transmission is calculated as a quadratic function of ac tive power now, as represented in a DC load flow model, The predispatc h model, was evaluated under typical operational conditions, achieving significant savings with respect to actual operation.