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Corresponding Author

El-Sayed, Ibrahim

Subject Area

Electrical Engineering

Article Type

Original Study

Abstract

The paper describes and implements a stand-alone! unity power factor, controllable current source converter system. It is based on high frequency PWM technique. The converter topology is chosen to operate for both inverter and rectifier modes. Firstly, the principle of operation is discussed. Then. the presented AC-DC converter that demands only sinusoidal active current is studied Most features of the converter are dearly interpreted for resistive and dynamic loads. On the basis of the given analysis, the paper provides PWM converter design guidelines for unity power factor operation. Also, a novel control strategy is proposed, which .allows to fulfill all the specifications; in particular zero reactive power demand and very low distorted line currents have been guaranteed. The proposed method in this paper utilizes simultaneously the control variables: modulation index D (variab1e PWM pattern) and power angle 8 (position of the PWM pattern). The instantaneous control for both achieves high--dynamic response and insensitiveness to parameter variations and disturbances. Also, the presented control structure employs power factor adjustment capability. This development provides a low cost solution, where no digital signal processors or large memories for the PWM generation are required. Results from device Lwei PSPlCE confirm the validity of the proposed method and the performed analysis. The proposed system can be utilized for power conditioning, DC and AC drive applications.

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