Estimation of exact equivalent parameters of synchronous machines for power system studies

Abstract

Synchronous generators form the principal source of electrical energy in power system. Many large loads are driven by synchronous motors. For stability studies of large power systems, accurate representation of the synchronous machine is required. The synchronous machine equations have the inductances and resistances of the stator and rotor circuits as parameters. These are referred to as fundamental parameters or basic parameters. While the fundamental parameters completely specify the machine electrical characteristics, they cannot be directly determined from measured responses of the machine. Therefore, the traditional approach to assigning machine data has been to express them in terms of derived parameters that are related to observed behavior as viewed from the terminals under suitable test conditions. This project is aimed at modeling and analyzing different models of synchronous machine. Models with different number of damper windings are analyzed and fundamental parameters of the machine are obtained using manufacturer‟s data. Newton Raphson method is used to solve the rotor and stator equations for the equivalent circuits of models and simulated in MATLAB. An experimental data is used to simulate the models and results are studied. Frequency domain analysis is performed to obtain transient time constants and compared with those obtained from computer simulation.