Two methods for controlling three-time fundamental frequency neutral-point voltage oscillation in a hybrid VIENNA rectifier

This study presents two methods of controlling neutral-point voltage oscillation in a hybrid VIENNA rectifier, which is composed of the parallel association of a three-phase single-switch Boost rectifier with a VIENNA-type rectifier. The neutral-point oscillation reason has been analysed with a math...

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Bibliographic Details
Published in:IET power electronics 2019-04, Vol.12 (4), p.932-943
Main Authors: Song, Wei-zhang, Dai, Zhi-hao, Xie, Nan, Wang, You-yun, Wheeler, Pat
Format: Article
Language:English
Subjects:
dual‐carrier pulse‐width modulation method
dual‐carrier PWM method
harmonic distortion
hybrid VIENNA rectifier
input current total harmonic distortion
neutral‐point control methods
power conversion harmonics
PWM rectifiers
rectifying circuits
Research Article
single‐switch Boost rectifier
split DC‐link
switching convertors
three‐time fundamental frequency neutral‐point voltage fluctuation
three‐time fundamental frequency neutral‐point voltage oscillation
voltage control
zero‐sequence component injection
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Description
Summary:This study presents two methods of controlling neutral-point voltage oscillation in a hybrid VIENNA rectifier, which is composed of the parallel association of a three-phase single-switch Boost rectifier with a VIENNA-type rectifier. The neutral-point oscillation reason has been analysed with a mathematical model. Meanwhile, the two neutral-point control methods of a simplified method based on a zero-sequence component injection and a dual-carrier pulse-width modulation (PWM) method are proposed to control the voltage deviation of the split DC-link and three-time fundamental frequency neutral-point voltage fluctuation with a decrease from ±1.6 to ±1 V, respectively. Moreover, the significant oscillation in the neutral-point voltage caused by unbalanced loads or asymmetric capacitor parameters can also be effectively suppressed by using the dual-carrier PWM method. Furthermore, the performance comparison between these two methods is provided. The experimental results show that the system after being introduced the proposed two methods still exhibits a low-order input current harmonic such as second, third, and fourth harmonics as well as the input current total harmonic distortion is lower than the standard 5%.
ISSN:1755-4535
1755-4543
1755-4543
DOI:10.1049/iet-pel.2018.5017