Seleção de geradores para serem equipados com estabilizadores num sistema de potência.

Abstract

The main objective of this dissertation is to determine a better and more reliable technique for selection of the machines that should bestabilized in a large power system plant. As the system is non linear, this is linearized around an operation point, making use of disturbance techniques in a digital computer. After the linearization, diferent techniques are used and compared for determining the critical machines. These techniques are the following: 1) Technique used by F.P. de Mello and others (1980), on which the machines are represented by a linearized classic mode 1. 2) Technique with model representation in Jordan's configuration. The machines are represented by models that include excitation systems. This technique was sujested by Lai e Fleming (1980). 3) A new technique that makes use of modal contribution index in the system response, on which the machines are represented by models that include excitation systems. In this technique, not only the real part of the eigenvalues but all the contribution of the mode in the response is taken into account, what is the opposite if we compare it to the procedures existent nowadays. The procedure is sequential and makes use of a stabilizing action more s i gn i f i catj_ ve and reliable than the one that is used in O.H. Abdal la and others (1984).