Power quality improvements of arc welding power supplies by modified bridgeless SEPIC PFC converter

Journal of Power Electronics - 2020
Bouafassa, Amar1, Fernández-Ramírez, Luis M.2, Babes, Badreddine3
1Department of Electronics, Electrical Engineering and Automation, National Polytechnic School of Constantine, Constantine, Algeria
2Research Group in Sustainable and Renewable Electrical Technologies, Department of Electrical Engineering, Higher Polytechnic School of Algeciras, University of Cadiz, Cadiz, Spain
3Research Center in Industrial Technologies CRTI, Algiers, Algeria

Tóm tắt

This paper proposes an efficient bridgeless power factor corrected (PFC) modified single ended primary inductor converter (SEPIC) for arc welding power supplies (AWPS). The overall configuration is composed of two converters: (1) a modified bridgeless SEPIC PFC converter, which is controlled by a PI controller to achieve a high power factor and fast response; and (2) a full bridge buck converter with high-frequency transformer for high-frequency isolation to ensure arc welding stability. The proposed system is simulated under different operating conditions of an AWPS. It is also tested in real time by a hardware-in-the-loop system based on a dSPACE DS1103 control board. The system performances are evaluated based on power quality indices such as power factor, total harmonic distortions of the AC grid current, and voltage regulation. The obtained results show that the proposed controller enhances the weld bead quality by keeping a constant current at the output and a stable arc, meet the international power quality standards and robustness for voltage regulation.

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