Implementação de um estabilizador de sistemas de potência utilizando compensador FUZZY com características LEAD/LAG

Abstract

It is known that electric power systems are submitted to frequent changes of state, as for instance, in load variations, commutations of generators or transmission lines, inclusion of new equipments, contingencies, etc. These changes should be compensated in a way to maintain the electric systems operating properly with certain specified dynamic. The development of new areas of the control theory, as well as of new technologies, allows new compensation methodologies can be applied to electric power systems, aiming at obtainment of stabler behaviors and improvements in the efficiency of these systems. This work proposes the utilization of a fuzzy controller that introduces characteristics of phase lead or lag applied to a power systems stabilizer. The objective is to obtain a better acting in front to the conventional systems of compensation. Seeking to obtain practical results, besides mathematical models and numeric simulations, experiments will be also elaborated using a laboratory bench that will act (in reduced scale) the real systems found in the practice. The obtained results demonstrate the potential front to real disturbances in an electric system. The fuzzy compensation process proposed possesses great flexibility in what refers to simulations and real tests. The practical experiments shown in the work seek to compare and to validate the proposed method. The new fuzzy stabilizer is a viable alternative that improves the dynamic acting of the damping system, with positive effects for the stability of the process in subject.