AC-DC Converter Operation for Active Sinusoidal Line Converter.

Document Type : Research Studies

Author

Faculty of Engineering and Technology., Helwan University., Cairo., Egypt.

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.  

Main Subjects

MEJ- Mansoura Engineering Journal
Volume 20, Issue 2
VOL 20 has Two Issues Issue 2 Consist of Two Parts from ( March to June)
June 1995
Pages 56-70

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