A capacitor voltage self‐balancing method of modular multilevel converters based on switching state matrix construction
Abstract This study presents a submodule capacitor voltage self‐balancing method for modular multilevel converters (MMCs) based on switching state matrix construction, which has an advantage over eliminating massive sensor demanding and alleviating computational burden for a large number of submodul...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2023-05-01
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| Series: | IET Power Electronics |
| Subjects: | |
| Online Access: | https://doi.org/10.1049/pel2.12461 |
| _version_ | 1797825341888135168 |
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| author | Zhou Yiyuan Qin Liang Wang Qing Yu Xue Pu Qingxin Yang Shiqi Liu Zhaoxun Liu Kaipei |
| author_facet | Zhou Yiyuan Qin Liang Wang Qing Yu Xue Pu Qingxin Yang Shiqi Liu Zhaoxun Liu Kaipei |
| author_sort | Zhou Yiyuan |
| collection | DOAJ |
| description | Abstract This study presents a submodule capacitor voltage self‐balancing method for modular multilevel converters (MMCs) based on switching state matrix construction, which has an advantage over eliminating massive sensor demanding and alleviating computational burden for a large number of submodules. It is mathematically proved that MMC has only one static equilibrium operating point to which the submodule capacitor voltages will converge naturally by the evaluation of capacitor voltage deviation index. A novel switching state matrix of submodules is constructed off‐line according to the mathematical proof, and the switching state vectors are cyclically selected from the matrix and distributed to the switching gate signals among the submodules to realize capacitor voltage self‐balance, avoiding real‐time capacitor voltage sampling and sorting. The proposed method is compatible with the conventional double closed‐loop control of MMCs. Theoretical conclusions are verified by simulations and experiments. |
| first_indexed | 2024-03-13T10:52:40Z |
| format | Article |
| id | doaj.art-c4e499c8f6bf47009276e7eeece1576b |
| institution | Directory Open Access Journal |
| issn | 1755-4535 1755-4543 |
| language | English |
| last_indexed | 2024-03-13T10:52:40Z |
| publishDate | 2023-05-01 |
| publisher | Wiley |
| record_format | Article |
| series | IET Power Electronics |
| spelling | doaj.art-c4e499c8f6bf47009276e7eeece1576b2023-05-17T11:41:35ZengWileyIET Power Electronics1755-45351755-45432023-05-011671181119910.1049/pel2.12461A capacitor voltage self‐balancing method of modular multilevel converters based on switching state matrix constructionZhou Yiyuan0Qin Liang1Wang Qing2Yu Xue3Pu Qingxin4Yang Shiqi5Liu Zhaoxun6Liu Kaipei7School of Electrical Engineering and Automation Wuhan University Wuhan ChinaSchool of Electrical Engineering and Automation Wuhan University Wuhan ChinaEquipment Management Department State Grid Corporation of China Beijing ChinaState Grid Hubei Extra High Voltage Company State Grid Corporation of China Wuhan ChinaGuizhou Power Dispatching Center Guizhou Power Grid Co., Ltd. Guiyang ChinaSchool of Electrical Engineering and Automation Wuhan University Wuhan ChinaSchool of Electrical Engineering and Automation Wuhan University Wuhan ChinaSchool of Electrical Engineering and Automation Wuhan University Wuhan ChinaAbstract This study presents a submodule capacitor voltage self‐balancing method for modular multilevel converters (MMCs) based on switching state matrix construction, which has an advantage over eliminating massive sensor demanding and alleviating computational burden for a large number of submodules. It is mathematically proved that MMC has only one static equilibrium operating point to which the submodule capacitor voltages will converge naturally by the evaluation of capacitor voltage deviation index. A novel switching state matrix of submodules is constructed off‐line according to the mathematical proof, and the switching state vectors are cyclically selected from the matrix and distributed to the switching gate signals among the submodules to realize capacitor voltage self‐balance, avoiding real‐time capacitor voltage sampling and sorting. The proposed method is compatible with the conventional double closed‐loop control of MMCs. Theoretical conclusions are verified by simulations and experiments.https://doi.org/10.1049/pel2.12461AC–DC power convertorscapacitor switchingDC–AC power convertorsHVDC power convertorsHVDC power transmission |
| spellingShingle | Zhou Yiyuan Qin Liang Wang Qing Yu Xue Pu Qingxin Yang Shiqi Liu Zhaoxun Liu Kaipei A capacitor voltage self‐balancing method of modular multilevel converters based on switching state matrix construction IET Power Electronics AC–DC power convertors capacitor switching DC–AC power convertors HVDC power convertors HVDC power transmission |
| title | A capacitor voltage self‐balancing method of modular multilevel converters based on switching state matrix construction |
| title_full | A capacitor voltage self‐balancing method of modular multilevel converters based on switching state matrix construction |
| title_fullStr | A capacitor voltage self‐balancing method of modular multilevel converters based on switching state matrix construction |
| title_full_unstemmed | A capacitor voltage self‐balancing method of modular multilevel converters based on switching state matrix construction |
| title_short | A capacitor voltage self‐balancing method of modular multilevel converters based on switching state matrix construction |
| title_sort | capacitor voltage self balancing method of modular multilevel converters based on switching state matrix construction |
| topic | AC–DC power convertors capacitor switching DC–AC power convertors HVDC power convertors HVDC power transmission |
| url | https://doi.org/10.1049/pel2.12461 |
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