Power line conditioner based on CA PWM Chopper

Utility power quality problems like input voltage unbalance and sag conditions severely stress electronic equipment. Voltage sag forecasting is a complex issue, since it involves a large variety of random factors, such as: type of short-circuits in the power system, location of faults, protective system performance and atmospheric discharges. Recently, the AC-AC converters have been proposed as voltage compensator. In this paper a new topology is proposed; its main advantage is that in addition to compensate voltage sag, it can compensate voltage swell too, by changing the duty ratio.