Influência dos modelos das cargas na estabilidade dinâmica de tensão

Abstract

In the last years, important studies have shown the critical effect of load representation in stability studies and, therefore, the need to find more accurate load models than those traditionally used. It is generally recognized that load representation is an important element in voltage stability studies since it affects power system dynamic performance. Given an electric power system topology, the behaviour of a system following a contingency, or the possibility of voltage collapse occurring, depends to a great extent on how the loads are represented. In this paper it is studied and analysed the effect of the composite load models in the dynamic voltage stability of an electric power network. A severe contingency situation was simulated. The automatic voltage regulators of the generating units, the turbine speed governors, and the under load tap changers models were taken into account. The simulation results were obtained using the EUROSTAG software package. Finally, some conclusions that provide a better understanding of the dynamic voltage stability are pointed out.