The effects of faults on voltage stability of long electrical power transmission systems

Voltage stability is one of the most important problems faced in power system operation and control. Recently, a lot of attention has been paid to the subject of dynamic voltage stability. It is well known that the major components of the power system affecting the dynamic voltage stability are constant power loads and transmission lines. In this study, the effects of faults on transmission lines from the viewpoint of voltage stability are investigated. It is shown that transmission line faults significantly increase the disturbance effect, which causes dynamic voltage instability.