Analysis of Voltage Sag in Power Distribution System Based on PSCAD/EMTDC and Research of Restrain Mensurement

Along with the wide application of sensitive equipment in industry, the requirement of power quality from consumers becomes higher and higher. Voltage sag, which is the important factor to threaten the power quality, has become one of the serious problem of dynamic power quality that influence the safety and natural operation of a great many power devices. How to improve the dynamic power quality of distribution system and reject the disturbances on sensitive power customers caused by voltage sag are great significance. This paper build up the electromagnetic transient model of voltage sag,analysis the voltage sag caused by circuit fault. Circuit fault at different place which result in voltage sag to consumer are compared. In addition, measures to control voltage sag for utility and consumers are put forward..