During the elaboration of power system models, researchers always want to be as near as possible to reality, but the technical knowledge has been used only to determine the "worst-case'' (Miranda et alli., 1990) or the best power value for the busbars. A few number of applications have been proposed to deal with information like "the voltage at node k is high''. This paper uses fuzzy numbers (bell shape) to represent imprecise variables and presents methods of fuzzy load flow that provide better results when compared with others and the results can also be interpreted through linguistic terms.
Fuzzy-set theory; load flow
