Modelagem dinâmica do transformador regulador utilizando o Programa ATP

Abstract

This research presents a mathematical model for a voltage regulator transformer with on load tap change, in order to perform dynamic stability studies in an electrical system. It permits verifying the behavior of the voltage, current, frequency, active and reactive powers, after disturbances in this system. It can simulate and evaluate electromagnetic and electro-mechanical transients caused by its operation which can affect the quality power of the electric system. The model of the transformer is divided into three different parts, which represent the voltage regulator transformer of a substation. Those parts are: the modeling of the transformation system, the modeling of the commutation mechanical system and the modeling of the electro-mechanical system of the on load tap change. The mathematical model implemented in the ATP program consists of linear and non-linear inductors that represent the magnetic flux through the air and through the core, respectively. The non-linear inductors are represented by the transformer s magnetization curve. The TACS routine in the ATP program was used to simulate the on load tap change. The implemented model presented a good performance regarding the simulations of the transformer operative modes in a substation.