EQUIVALENTES ESTÁTICOS PARA SELECCIÓN DE CONTINGENCIAS EN SISTEMAS ELÉCTRICOS DE POTENCIA

Abstract

Before the 40's, the number of interconnections in electrical power systems (SEP's) were very small, which were predominantly radial. The studies of these systems were relatively simple, at least could be made without recourse to large computing resources. But once it became apparent the benefits of interconnection, the complexity of the (SEP's) was growing and required studies were more demanding. Fortunately this development coincided with the birth of the digital computer. A consequence of these developments for the study of power flows had to make several techniques for reducing large-scale power networks, the methods were developed to calculate equivalent static network are the equivalent of Ward and Hale (or nodal elimination ) and REI (Radial Equivalent and Independent). The equivalent of Ward and Hale is composed of an inner area and outer area. The aim of this equivalent is that the behavior of the internal system (area of interest) retain their original condition and operation of external system behavior (area of no interest) can be replaced by an equivalent system, with these points you can make power flow study by comparison with the original or base case and implemented as initial conditions in order to make a contingency analysis at steady state. REI means Equivalent Radial and Independent. It has been documented in great detail in several publications. Its fundamental point of separation of the Electrical System in 3 different subsystems internal area is where you will study or application, the boundary buses system is that divides the internal and external system and the external system which is where they form REI type equivalents. Usually REI equivalent type are a representation of a lossless network of low shots, in other words, an alleged power network with "zero" balance. The purpose of this work is to present the application of simulated equivalent methodologies developed in FORTRAN program with which you can see the comparison of power flow analysis with both Ward and Hale equivalent REI noting the advantages and disadvantages to each The other thing to try is the application of these methods to the steady-state contingency analysis from the basic method for selecting contingencies that are the starting point for assessing the safety of an Interconnected Power System. The techniques proposed in this paper were applied to four test systems, which were simulated with FORTRAN programs developed and validated with the commercial software PSS Power System Simulator.