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Hierarchical Energy Balance Control Method for M3C based on Injecting Output Frequency Circulating Currents

Lookup NU author(s): Jiankai Ma, Dr Mohamed Dahidah, Professor Volker Pickert, Dr James Yu

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by IEEE, 2019.

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Abstract

This paper presents a simplified hierarchical energy balance control method for a modular multilevel matrix converter (M3C) operating as a frequency changer (50Hz to 50/3Hz) for Low Frequency AC (LFAC) transmission system. The proposed method employs an independent energy balance control for each sub-converter of M3C with only injecting the output frequency circulating current, aiming at balancing the energy among the three arms of the sub-converter. Then the modulation technique is redesigned to balance the energy among n sub-modules within each arm. The proposed method simplifies the computational complexity of M3C by considering the subconverter independently, enabling an easy and efficient way to control M3C. The feasibility of the proposed method is evaluated with normal and dynamic operation, which includes step changes in the output frequency and voltage. The performance and effectiveness of the proposed control strategy is demonstrated by extensive simulation studies and experimentally validated using a scaled-down laboratory prototype.


Publication metadata

Author(s): Ma J, Dahidah MSA, Pickert V, Yu J

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Power Electronics

Year: 2019

Pages: ePub ahead of print

Online publication date: 25/07/2019

Acceptance date: 17/07/2019

Date deposited: 01/08/2019

ISSN (print): 0885-8993

ISSN (electronic): 1941-0107

Publisher: IEEE

URL: https://doi.org/10.1109/TPEL.2019.2931048

DOI: 10.1109/TPEL.2019.2931048


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