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Dual harmonic injection for reducing the sub-module capacitor voltage ripples of hybrid MMC

Xu, Jianzhong, Deng, Weicheng, Gao, Chenxiang, Lu, Feng, Liang, Jun, Zhao, Chengyong and Li, Gen 2021. Dual harmonic injection for reducing the sub-module capacitor voltage ripples of hybrid MMC. IEEE Journal of Emerging and Selected Topics in Power Electronics 9 (3) , pp. 3622-3633. 10.1109/JESTPE.2020.3027464

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Abstract

Reducing the capacitor voltage ripples of the half-bridge sub-modules (HBSM) and full-bridge sub-modules (FBSM) in a hybrid modular multilevel converter (MMC) is expected to reduce the capacitance, volume and costs. To address this issue, this paper proposes a dual harmonic injection method which injects the second harmonic circulating current and third order harmonic voltage into the conventional MMC control. Firstly, the mathematical model of the proposed control is established and analyzed. Then, the general strategy of determining the amplitude and phase angle of each injection component is proposed to suppress the fluctuations of the fundamental and double frequency instantaneous power. The proposed strategy can achieve the optimal power fluctuation suppression under various operating conditions, which also has the advantage of reducing the voltage fluctuation difference between HB and FB SMs. The correctness and effectiveness of the proposed strategy are verified in simulations in PSCAD/EMTDC.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: IEEE
ISSN: 2168-6777
Date of First Compliant Deposit: 25 September 2020
Date of Acceptance: 25 September 2020
Last Modified: 06 Oct 2021 13:42
URI: http://orca.cardiff.ac.uk/id/eprint/135133

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