Quality Of Electrical Power System and New Trends

Good power quality means that consumer is to be fed by voltages and currents at nominal specified values and at as high as possible of power factor, in order to avoid penalty and minimize network loss. Voltage sag is a momentary (less than a few seconds) in voltage outside the normal limits.Voltage sags are important to industrial reliability. Modern process controls are often sensitive to Voltage sags. Voltage sag may represent one of the major power quality problems.In this thesis