A New Adaptive Fuzzy Pi Control to Stability Control of Power System

This paper introduces a fuzzy PI controller as a power system stabilizer. The fuzzy PI controller has been designed to prepare an auxiliary signal to the excitation system of the synchronous generator. The proposed controller utilizes a combination of a fuzzy logic controller (FLC) and a PI controller. In comparison with the conventional fuzzy controllers, the proposed fuzzy PI controller incorporates the advantages of a FLC and a conventional PI controller. By implementing this controller instead of conventional PSS the damping of local modes of oscillations in a power system will be handled substantially. In addition, the paper considers the conventional PSS and compares its performance with respect to three proposed types of fuzzy PI controller. Also the effects of the supplementary signals in damping oscillation have been shown. Finally, to investigate the effectiveness of the proposed controller in damping oscillations a three-phase short circuit condition is investigated to illustrate the application of the developed methodology. The obtained results show that the proposed controller for stabilizing power system can provide very good damping characteristic.