Circulating Current Harmonics Suppression for Modular Multilevel Converters Based on Repetitive Control

Binbin Li; Dandan Xu; Dianguo Xu

Circulating Current Harmonics Suppression for Modular Multilevel Converters Based on Repetitive Control

Binbin Li

Dandan Xu

Dianguo Xu

Vol. 14, No. 6, pp. 1100-1108, Nov. 2014

10.6113/JPE.2014.14.6.1100

Circulating current harmonics

Modular multilevel converter (MMC)

Repetitive control

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Abstract

Modular multilevel converters (MMCs) have emerged as the most promising topology for high and medium voltage applicationsfor the coming years. However, one particular negative characteristic of MMCs is the existence of circulating current, whichcontains a dc component and a series of low-frequency even-order ac harmonics. If not suppressed, these ac harmonics will distortthe arm currents, increase the power loses, and cause higher current stresses on the semiconductor devices. Repetitive control (RC) iswell known due to its distinctive capabilities in tracking periodic signals and eliminating periodic errors. In this paper, a novelcirculating current control scheme base on RC is proposed to effectively track the dc component and to restrain the low-frequency acharmonics. The integrating function is inherently embedded in the RC controller. Therefore, the proposed circulating current controlonly parallels the RC controller with a proportional controller. Thus, conflicts between the RC controller and the traditionalproportional integral (PI) controller can be avoided. The design methodologies of the RC controller and a stability analysis are alsointroduced. The validity of the proposed circulating current control approach has been verified by simulation and experimentalresults based on a three-phase MMC downscaled prototype.

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Cite this article

[IEEE Style]

B. Li, D. Xu, D. Xu, "Circulating Current Harmonics Suppression for Modular Multilevel Converters Based on Repetitive Control," Journal of Power Electronics, vol. 14, no. 6, pp. 1100-1108, 2014. DOI: 10.6113/JPE.2014.14.6.1100.

[ACM Style]

Binbin Li, Dandan Xu, and Dianguo Xu. 2014. Circulating Current Harmonics Suppression for Modular Multilevel Converters Based on Repetitive Control. Journal of Power Electronics, 14, 6, (2014), 1100-1108. DOI: 10.6113/JPE.2014.14.6.1100.