Polynomial loss models for economic dispatch and error estimation

Polynomial loss models are introduced for the economic dispatch problem. The models are based on interpolations of load flow solutions. An approximate error estimation method for the loss models is also presented. The effect of approximate loss models on the economic dispatch is evaluated according to the deterioration of total generation cost in addition to the relative values of the coefficients of the loss formula. Case study shows that loss expressions have characteristics which have not been considered previously. Comparisons between the proposed models and the generalized generation distribution factor (GGDF) based models show the advantages of the proposed models