Analysis of frequency inverter supportability to voltage sags

This work presents a study about the tolerance of a frequency inverter when submitted to voltage sags, which are events directly related to the electric power quality. The frequency inverters are devices widely used in the industry applications in variable speed drives. According to the magnitude and duration of the voltage sag, the frequency inverters operation can be changed and the industrial process in which they are involved is also affected, and, in some cases, could generate great production losses. In this work, the effects of different voltage sags on a frequency inverter are presented to determine its supportability to these events.