A multi-level buck converter based rectifier with sinusoidal inputs and unity power factor for medium voltage (4160-7200 V) applications

A novel rectifier topology for high power (0.5 to 10 MVA) current source based AC motor drives is proposed. This rectifier is composed of a multi-winding transformer, a multilevel diode rectifier and a multi-level buck converter. The rectifier produces near unity input power factor and sinusoidal input current under any operating conditions. In addition, the proposed rectifier has a few other features such as reliable operation and high voltage operation capability. This paper addresses a number of system design considerations such as switching pattern, input power quality and the effects of discrepancies of transformer leakage inductances on the system performance. Experimental results on a 5 kVA/208 V four-level prototype are also included.

[1]  R. Itoh.  Stability of induction motor drive controlled by current-source inverter , 1989 .

[2]  Bin Wu,et al.  Medium voltage motor harmonic heating, torques and voltage stress when applied on VFDs , 1996, Proceedings of 1996 IAS Petroleum and Chemical Industry Technical Conference.

[3]  P. M. Espelage,et al.  Symmetrical GTO current source inverter for wide speed range control of 2300 to 4160 volt, 350 to 7000 hp, induction motors , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[4]  Bin Wu,et al.  A PWM CSI-based vector controlled medium voltage AC drive with sinusoidal input and output waveforms , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[5]  Bin Wu,et al.  A multi-level thyristor rectifier with improved power factor , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[6]  Bin Wu,et al.  Voltage stress on induction motors in medium voltage (2300 to 6900 V) PWM GTO CSI drives , 1995 .

[7]  K. Kousaka,et al.  Three-phase current source GTO rectifier adopting new PWM control techniques , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[8]  R. C. Quirt.  Voltages to ground in load-commutated inverters , 1988 .

[9]  David E. Rice.  A detailed analysis of six-pulse converter harmonic currents , 1992, [1992] Record of Conference Papers Industry Applications Society 39th Annual Petroleum and Chemical Industry Conference.