Low-order circulating current suppression of PWM-based modular multilevel converters using DC-link voltage compensation

Sun, Y, Teixeira, C, Holmes, G, McGrath, B and Zhao, J 2018, 'Low-order circulating current suppression of PWM-based modular multilevel converters using DC-link voltage compensation', IEEE Transactions on Power Electronics, vol. 33, no. 1, pp. 210-225.


Document type: Journal Article
Collection: Journal Articles

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Title Low-order circulating current suppression of PWM-based modular multilevel converters using DC-link voltage compensation
Author(s) Sun, Y
Teixeira, C
Holmes, G
McGrath, B
Zhao, J
Year 2018
Journal name IEEE Transactions on Power Electronics
Volume number 33
Issue number 1
Start page 210
End page 225
Total pages 16
Publisher IEEE
Abstract This paper presents a new feed-forward strategy for suppressing low-order harmonic circulating currents in pulsewidth-modulated (PWM) based modular multilevel converters (MMCs). The approach is based on the new average model approach established in this paper, which identifies cross-coupling interactions between the system-level and submodule elements using decomposed dependent sources. As well as improving the damping of the system, the major advantage of this approach is that it maintains the natural DC bus balance property of a PWM modulated MMC by considering the upper and lower arms together (unlike existing feed-forward schemes which treat each MMC arm independently). Moreover, unlike existing direct control resonant strategies, which require careful gain tuning and are highly dependent on the ac system frequency, the proposed approach achieves wideband circulating current ripple suppression without requiring knowledge of the circulating current harmonic frequencies and needs only a simple proportional-integral (PI) controller to regulate the circulating current dc component for power balance. This makes it particularly suitable for use in multifrequency or variable-frequency ac systems. Extensive simulation and matching experimental results, including steady-state and transient responses compared against existing circulating current suppression approaches, validate the effectiveness and benefits of this new feed-forward compensation technique.
Subject Industrial Electronics
Power and Energy Systems Engineering (excl. Renewable Power)
Keyword(s) circulating current ripple
common and differential modes
dc-link voltage compensation
modular multilevel converter (MMC)
voltage feed forward
DOI - identifier 10.1109/TPEL.2017.2670369
Copyright notice © 2017 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.
ISSN 0885-8993
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