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A novel three-phase three-switch three-level high power factor SEPIC-type AC-to-DC converter

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5 Author(s)
Kolar, J.W. ; Power Electron. Sec., Tech. Univ. Wien, Austria ; Sree, H. ; Drofenik, U. ; Mohan, N.
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In this paper, the topology of a new three-phase three-switch three-level PWM rectifier system is derived based on the basic structure of a DC-to-DC SEPIC power converter. The system is characterized by full controllability of the power flow (independent of the level of the output voltage) and by a sinusoidal mains current shape in phase with the mains voltage. The operating principle of the power converter is explained based on the conduction states of a bridge leg within a pulse period. The stationary operating behavior is analyzed by digital simulation based on the control of the mains phase currents by independent ramp-comparison controllers. Furthermore, a mathematical description of the operating behavior of the three-phase system including the coupling of the phase current controllers (given due to the floating mains star point) is discussed. Finally, results of an experimental investigation of a laboratory model of the power converter are presented

Published in:

Applied Power Electronics Conference and Exposition, 1997. APEC '97 Conference Proceedings 1997., Twelfth Annual  (Volume:2 )

Date of Conference:

23-27 Feb 1997