As the load in a power system continually changes, it is important to regulate the generator operating point. In this paper, assuming a suitable operating range for the generator the regulations for typical generator operating points within this range are selected and then fuzzy controllers are designed accordingly. To investigate the adaptation of each controller, a considerable number of simulations are carried out for the various operating point changes. By investigating the control performance of the adaptive controllers quantita-tively, a design method for fuzzy controllers for generator operating point regulation is proposed. Further-more, a comparative estimation of the fuzzy control formula and optimal control formula with an observer is made using a common quantitative criterion. In addition, a one-machine infinite-bus system including limits on the AVR and governor is used as the control object model.
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