Title :
Equivalence of SVM and Carrier-Based PWM in Three-Phase/Wire/Level Vienna Rectifier and Capability of Unbalanced-Load Control
Author :
Lijun Hang ; Bin Li ; Ming Zhang ; Yong Wang ; Tolbert, Leon M.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of Tennessee, Knoxville, TN, USA
Abstract :
In this paper, the analysis of space vector modulation of a three-phase/wire/level Vienna rectifier is conducted, according to which the implementation of the equivalent carrier-based pulsewidth modulation is deduced theoretically within each separated sector in the diagram of vectors. The voltage balancing ability of dc-link neutral point, which depends on the uneven distribution of short vectors, is analyzed as well. An adaptive and robust controller to balance the output voltage under the unbalanced load limit for different modulation indices is proposed. The proposed controller can work at wide range of unbalanced load condition as well. Furthermore, the maximum unbalanced load is deduced versus the modulation index m when the converter works in unity power factor. An experimental prototype of 2.5 kW was built to verify the effectiveness of the theoretical analysis. Finally, the tested unbalanced limit of outputs for the experimental platform was given under different modulation indices. The output voltages for dual bus are balanced, and the theoretical analysis is verified.
Keywords :
PWM power convertors; adaptive control; load regulation; power factor; rectifiers; robust control; SVM equivalence; adaptive controller; carrier-based PWM; dc-link neutral point; equivalent carrier-based pulsewidth modulation; power 2.5 kW; power converter; robust controller; space vector modulation; three-phase-wire-level Vienna rectifier; unbalanced-load control capability; unity power factor; voltage balancing ability; Pulse width modulation; Rectifiers; Support vector machines; Switches; Topology; Vectors; Carrier-based pulsewidth modulation (PWM); Vienna rectifier; common-mode component; dc-link neutral point balance; space vector modulation (SVM);
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2013.2240637