Abstract
The application of technologies for the improvement of voltage stability, particularly during contingencies is a major concern in the field of power networks operation and control. In this paper it is studied the FACTS performance in the dynamic voltage stability of an electric power system. It was considered the influence of two FACTS controllers in parallel or shunt connection, the Static VAR Compensators (SVC) and the Static Synchronous Compensators (STATCOM) in the dynamic voltage stability during a disturbance of the BPA test power network. The models of SVC and STATCOM were developed in EUROSTAG. The Automatic Voltage Regulators (AVR) of the generating units and the turbine speed governors were modelled in detail. Different load models were used and the Under Load Tap Changers (ULTC) were also taken into account. Finally, some conclusions that provide a better understanding of the dynamic voltage stability using FACTS devices during a disturbance are pointed out.
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