1 Study of AC Line Voltage Disturbance on the Direct Power Controlled PWM Rectifier

Abstract: In resent years because of the increasing amount of electronic equipment and nonlinear loads, disturbances and harmonic pollution in power systems have been widely increased. These undesired phenomena have undesired influence on the control and automatic equipment, such as motor drives, resulting in reduced reliability and availability. usuall motor drives utilize voltage and current source converter. Because of limitation and weakness of these converters against disturbances, some new topologies are presented in advanced drive such as DPC – PWM rectifier. Thanks to well known capabilities of DPC-PWM rectifier, such as robustness, improved power factor, good dynamic, etc, classical converter’s problem can be overcome. In this paper performance of this rectifier under disturbed line voltage is investigated. For this purpose a DPC-PWM rectifier is simulated under unbalance and symmetrical / asymmetrical voltage sags. Then the results are compared to the conventional rectifiers