Title :
Zero-crossing distortion in grid-coupled AC-DC converters
Author :
De Gusseme, K. ; Van De Sype, David M. ; Ryckaert, Wouter R. ; De Vleeschauwer, V.A. ; Melkebeek, J.A.
Author_Institution :
Dept. of Electr. Energy, Syst. & Autom., Ghent Univ.
Abstract :
Zero-crossing distortion in modern rectifiers and inverters may have different causes: the commutation dead time, the use of diode bridge rectifiers, discontinuities in the PWM-generation. In this paper, another cause of zero-crossing distortion is analysed: when a security dead time is inserted between the gate signals of two switches in the same leg, some line current distortion may appear close to the zero-crossing of the line current due to errors in the sampling of that line current. An overview of the sampling requirements for a digitally controlled full-bridge AC-DC converter is given and a detailed analysis of the line current distortion is performed. The analysis is verified with experimental waveforms and a solution is proposed to decrease the line current distortion
Keywords :
AC-DC power convertors; PWM power convertors; bridge circuits; digital control; power engineering computing; power grids; PWM-generation; commutation dead time; current distortion; diode bridge rectifiers; full-bridge AC-DC converter control; grid-coupled AC-DC converters; inverters; zero-crossing distortion; AC-DC power converters; Bridges; Diodes; Distortion; Pulse width modulation inverters; Rectifiers; Sampling methods; Security; Signal analysis; Switches; !ac-dc conversion. zero-crossing distortion. dead time. sampling;
Conference_Titel :
Power Electronics and Applications, 2005 European Conference on
Conference_Location :
Dresden
Print_ISBN :
90-75815-09-3
DOI :
10.1109/EPE.2005.219537
