Modeling, Control, and Experimental Evaluation of Multifunctional Converter System

The multifunctional converter system (MFCS) is a special topology of three-phase ac motor drives, which inherently integrates a dc-voltage regulation function. First, in order to explain the mechanism of the MFCS, an average model is derived in this article. An equivalent circuit is developed, which...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2021-09, Vol.68 (9), p.7747-7756
Main Authors: Zhang, Xiaokang, Gauthier, Jean-Yves, Lin-Shi, Xuefang, Delpoux, Romain, Tregouet, Jean-Francois
Format: Article
Language:English
Subjects:
A C motors
AC motors
D C motors
Data buses
DC/dc converter
Directional control
Electric converters
Electric potential
Equivalent circuits
Inverters
Mathematical model
neutral point
Permanent magnet motors
permanent magnet synchronous machine (PMSM) drives
Permanent magnets
Pulse duration modulation
Pulse width modulation
Synchronous machines
Synchronous motors
Topology
Voltage
Voltage control
zero-sequence
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Summary:The multifunctional converter system (MFCS) is a special topology of three-phase ac motor drives, which inherently integrates a dc-voltage regulation function. First, in order to explain the mechanism of the MFCS, an average model is derived in this article. An equivalent circuit is developed, which explicitly reveals that the MFCS is equivalent to a cascaded dc/dc converter-dc motor drive system. Second, the inverter's mean duty cycle is identified as an independent control degree of freedom for the dc-bus voltage. Then, the influence of pulsewidth modulation (PWM) on the dc-bus voltage is studied. It concludes that space vector PWM is invalid for the MFCS. To address this problem, the zero-sequence voltage injection PWM (ZSVIPWM) is proposed and actually sinusoidal PWM is a special case of the ZSVIPWM. Third, an overall control strategy is proposed for the MFCS, which includes not only the vector control for the motor but also a closed-loop control for the dc-bus voltage. Finally, comparative experiments with the standard topology are carried out on a permanent magnet synchronous machine prototype to verify these theoretical analyses and the control strategy.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2020.3013779