Zero-crossing distortion in grid-coupled AC-DC converters

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

[1]  D.M. Van de Sype,et al.  A sampling algorithm for digitally controlled boost PFC converters , 2004, IEEE Transactions on Power Electronics.

[2]  Jan A. Melkebeek,et al.  Duty-ratio feedforward for digitally controlled boost PFC converters , 2003, Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2003. APEC '03..

[3]  C.B. Jacobina,et al.  Dead-time compensation in the zero-crossing current region , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..

[4]  Jian Sun,et al.  On the Zero-Crossing Distortion in Single-Phase PFC Converters , 2004 .

[5]  Michael Lindgren,et al.  Influence of nonlinearities on the frequency response of a grid-connected vector-controlled VSC , 1999, IEEE Trans. Ind. Electron..

[6]  J.A.A. Melkebeek,et al.  Influence of commutation dead time on the steady-state and dynamic characteristics of fixed-pattern rectifiers , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[7]  Seung-Ki Sul,et al.  Inverter output voltage synthesis using novel dead time compensation , 1996 .

[8]  Yoshihiro Murai,et al.  Waveform Distortion and Correction Circuit for PWM Inverters with Switching Lag-Times , 1987, IEEE Transactions on Industry Applications.

[9]  D.M. Van de Sype,et al.  Design issues for digital control of boost power factor correction converters , 2002, Industrial Electronics, 2002. ISIE 2002. Proceedings of the 2002 IEEE International Symposium on.

[10]  Jan A. Melkebeek,et al.  Digitally controlled boost power-factor-correction converters operating in both continuous and discontinuous conduction mode , 2005, IEEE Transactions on Industrial Electronics.

[11]  Jian Sun,et al.  On the zero-crossing distortion in single-phase PFC converters , 2004, IEEE transactions on power electronics.

[12]  Frederik De Belie,et al.  Improved Voltage Compensator for Digitally Controlled Boost PFC Converters , 2003 .

[13]  Mark J. Jansen,et al.  Zero-crossing distortion in grid-connected PV inverters , 2005, IEEE Transactions on Industrial Electronics.