Modulation scheme for delta-type current source rectifier to reduce input current distortion

To reduce the conduction loss, a novel three-phase current source rectifier, named Delta-type Current Source Rectifier (DCSR), has been proposed in previous research. This rectifier has delta-type connection on its input side, and its dc-link current can be shared by multiple devices at a time to reduce up to 20% conduction loss. A high-efficiency modulation scheme for DCSR has been proposed, where the conduction states involve more switches to share the dc-link current. However, it causes current distortion when the input voltages have intersections. In this paper, the phenomenon is analyzed in detail. The clamped voltage on the diode bridge will fluctuate at the voltage intersections, resulting in false current pulse and distortion. An improved modulation scheme is then proposed for DCSR to reduce the input current distortion without sacrificing much efficiency. Through experiment in a 7.5 kW prototype, its effectiveness is verified and the total harmonic distortion (THD) of the input current is reduced dramatically.

[1]  L. Tolbert,et al.  An All-SiC Three-Phase Buck Rectifier for High-Efficiency Data Center Power Supplies , 2013 .

[2]  Paolo Tenti,et al.  Three-Phase AC/DC PWM Converter with Sinusoidal AC Currents and Minimum Filter Requirements , 1987, IEEE Transactions on Industry Applications.

[3]  T. Friedli,et al.  Design and Performance of a 200-kHz All-SiC JFET Current DC-Link Back-to-Back Converter , 2009, IEEE Transactions on Industry Applications.

[4]  B. J. Blalock,et al.  Compensation of input current distortion in three-phase buck rectifiers , 2013, 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[5]  Johann W. Kolar,et al.  Improving mains current quality for three-phase three-switch buck-type PWM rectifiers , 2006, IEEE Transactions on Power Electronics.

[6]  M.H. Bierhoff,et al.  Loss Minimized Pulse Width Modulation of IGBT Current Source Converters , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[7]  Johann W. Kolar,et al.  Comparative evaluation of modulation methods of a three-phase buck + boost PWM rectifier. Part I: Theoretical analysis , 2008 .

[8]  T. Friedli,et al.  Towards a 99% efficient three-phase buck-type PFC rectifier for 400 V DC distribution systems , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[9]  Heikki Tuusa,et al.  Optimal vector modulation of a PWM current source converter according to minimal switching losses , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[11]  J.W. Kolar,et al.  Comprehensive Design of a Three-Phase Three-Switch Buck-Type PWM Rectifier , 2007, IEEE Transactions on Power Electronics.

[12]  P. Mellor,et al.  Comparison of Losses in IGBT Based Voltage and current source converters using a single switching pole approach , 2010 .

[13]  Rik W. De Doncker,et al.  Design of a PWM current source rectifier for high power induction melting applications , 2009, 2009 13th European Conference on Power Electronics and Applications.

[14]  F. Fuchs,et al.  Analytical evaluation of the total harmonic current in three phase voltage and current source converters , 2005, 2005 European Conference on Power Electronics and Applications.

[15]  Johann W. Kolar,et al.  Design and Implementation of a Three-Phase Buck-Type Third Harmonic Current Injection PFC Rectifier SR , 2013, IEEE Transactions on Power Electronics.

[16]  T. Siebert,et al.  AC to DC power conversion now and in the future , 2001, Record of Conference Papers. IEEE incorporated Industry Applications Society. Forty-Eighth Annual Conference. 2001 Petroleum and Chemical Industry Technical Conference (Cat. No.01CH37265).