Voltage sag assessment with respect to sensitivity of adjustable speed drives in distributed generation environment

Voltage sag is one of the common and sensitive issues for customers and power system utilities. When voltage sag occurs at supply end will cause shutdown of the entire industrial operation process, it incurs financial and technical losses to the industries. Among various industrial processes, adjustable speed drives are more commonly used. According to data obtained from experimental tests performed on ASD, it is observed that voltage sag having magnitude below 0.7 p.u and duration 80ms leads to tripping of ASD. Further, new clean energy reforms motivating many countries towards power generation using renewable energy resources. This paper aims to investigate the effect on frequency of tripping of adjustable speed drive due to inclusion of distributed generation in power system network.