Analysis of High-Efficiency Three-Phase Two- and Three-Level Unidirectional Hybrid Rectifiers

This paper presents highly efficient three-phase high-power-factor hybrid rectifiers assembled by the parallel connection of a three-phase diode-bridge rectifier and series dc-dc boost converter with a two- or three-level unidirectional pulse width modulation (PWM) rectifier. The idea is to obtain a...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2013-09, Vol.60 (9), p.3589-3601
Main Authors: Soeiro, T. B., Kolar, J. W.
Format: Article
Language:English
Subjects:
Circuits
Clamps
Computational efficiency
Computing time
Feedback control strategy
Hybrid power systems
Hybrid systems
Joints
Mathematical analysis
Power generation
Pulse duration modulation
Pulse width modulation
Reactive power
rectifier systems
Rectifiers
Silicon
Studies
two- and three-level converters
Voltage control
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Summary:This paper presents highly efficient three-phase high-power-factor hybrid rectifiers assembled by the parallel connection of a three-phase diode-bridge rectifier and series dc-dc boost converter with a two- or three-level unidirectional pulse width modulation (PWM) rectifier. The idea is to obtain a rectifier that is robust, highly efficient, and simple as a diode-based rectifier and also able to benefit from the PWM rectifier capability to reduce the line current harmonic content. Exemplary three-phase unidirectional hybrid systems built with a two-level delta-switch rectifier and three-level T-type or VIENNA six-switch rectifiers are suggested. Additionally, control schemes, which are appropriate for safeguarding the high-power-factor operation while improving the power sharing rating of the hybrid paralleled rectifier units and able to handle a phase loss without changing the controller structure, are proposed. In order to evaluate the studied hybrid rectifiers, first, an efficiency comparison between two- and three-level hybrid systems with conventional PWM rectifiers is performed. After that, the loss calculations are extended to a variable chip area to allow a fair comparison between these rectifiers. Interestingly, it is shown that the presented hybrid systems not only can achieve a higher efficiency but also require less silicon area than the single PWM rectifiers they are based on. Finally, experimental results obtained with an assembled unidirectional hybrid delta-switch rectifier prototype are presented in order to demonstrate the performance and advantages of this solution.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2012.2205358