Experience with the analysis of small signal stability in longitudinal systems: a case study with the Mexican interconnected system

摘要

In this paper a fundamental study of the small signal stability characteristics of a longitudinal system representing a major equivalent of the Mexican power system is presented. The special characteristics of the Mexican system are emphasized and a number of studies regarding the nature and sources of low frequency oscillations are discussed. These studies reveal the emergence of an undamped swing mode involving the interaction of several machines and their controllers spread out over a large geographical area. The influence of system structure and loading, load effect and the application of several controllers on system damping is discussed.