Research on Voltage Sag Control Scheme Based on Fast Vacuum Switch

Voltage sag caused by short circuit fault will do great harm to sensitive load. In this paper, a voltage sag control scheme based on fast vacuum switch is proposed. Fast detection method is used to detect the occurrence of faults, and fast vacuum switch is used to limit the faults to a certain extent in a very short time to prevent the voltage sag from lasting too long. This paper describes the principle of the detection method, establishes the relevant mathematical model, and makes simulation analysis. At the same time, the system and fault model are established in PSCAD. The results show that the detection algorithm can detect the occurrence of faults in a very short time, control the fast switching action, and limit the duration of voltage sag to an acceptable range.