Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 66, Issue 3, Pages 2236-2246Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2018.2840484
Keywords
Capacitor voltage ripples; modular multilevel converter (MMC); three-terminal middle-cell
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Funding
- National Natural Science Foundation of China [51177118]
- Research Fund for the Doctoral Program of Higher Education of China [20130201110008]
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This paper presents a modified modular multilevel converter with the three-terminal middle-cells inserted between arms and ac-side for medium voltage applications. It is intended to reduce the submodule capacitor voltage ripples by controlling the high-frequency powers flowing among arm branches for low-frequency output operations without common-mode voltage injected in ac-side. Due to the physical connection among the upper arm, the lower arm and ac-side, the middle-cell can be regarded as the excess degree of freedom to modify the dc-side and ac-side characteristics. Therefore, the common-mode voltage in ac-side can be eliminated by the inverse common-mode voltage produced by the middle-cell in ac-side. Moreover, owing to the unique structure of the middle-cell, the middle-cell capacitor voltage also results in a small ripple due to the high-frequency current flowing into it by proper control. The operation principle and control strategy of the middle-cell has been proposed in detail. Simulation and experimental results have verified the effectiveness of the proposed topology.
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