A simplified space vector modulation implementation for modular multilevel converter by grouping submodules
Abstract Modulation strategy plays an important role in the good performance of modular multilevel converter (MMC). Since MMC has a special structure as well as a large number of submodules (SMs), it is almost impossible to apply the conventional multilevel space vector modulation (SVM) algorithm in...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-08-01
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| Series: | IET Power Electronics |
| Subjects: | |
| Online Access: | https://doi.org/10.1049/pel2.12086 |
| _version_ | 1811266401357266944 |
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| author | Zhihong Bai Haoqi Chen Yifei Li Yinuo Dong Hao Ma |
| author_facet | Zhihong Bai Haoqi Chen Yifei Li Yinuo Dong Hao Ma |
| author_sort | Zhihong Bai |
| collection | DOAJ |
| description | Abstract Modulation strategy plays an important role in the good performance of modular multilevel converter (MMC). Since MMC has a special structure as well as a large number of submodules (SMs), it is almost impossible to apply the conventional multilevel space vector modulation (SVM) algorithm in it. In this study, a simplified SVM implementation method is proposed by grouping SMs. With the presented method, the high‐level SVM process for MMC can be easily done by implementing multiple two‐level or three‐level SVM algorithm, while the complicated offline or online efforts/tasks about mapping switching states or sequences in the conventional multilevel SVM are not necessary any more. In order to improve the harmonic characteristics, the sampling time of different subunits (SUs), each of which is formed by grouping a few SMs, is staggered evenly, which helps to achieve a higher equivalent switching frequency and less low‐order harmonics. Further, the capacitor voltage balance of SMs is improved by rotation strategies between SUs or inside each SU even without any capacitor voltage detecting or sorting. Since the presented method is independent of the number of SMs, it can be very easily expanded into a high‐level MMC. These propositions are verified by experiment. |
| first_indexed | 2024-04-12T20:42:34Z |
| format | Article |
| id | doaj.art-51e33945580f454f9832a020db6acb84 |
| institution | Directory Open Access Journal |
| issn | 1755-4535 1755-4543 |
| language | English |
| last_indexed | 2024-04-12T20:42:34Z |
| publishDate | 2021-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | IET Power Electronics |
| spelling | doaj.art-51e33945580f454f9832a020db6acb842022-12-22T03:17:22ZengWileyIET Power Electronics1755-45351755-45432021-08-0114101725173410.1049/pel2.12086A simplified space vector modulation implementation for modular multilevel converter by grouping submodulesZhihong Bai0Haoqi Chen1Yifei Li2Yinuo Dong3Hao Ma4College of Electrical Engineering, Yuquan Campus Zhejiang University Hangzhou ChinaCollege of Electrical Engineering, Yuquan Campus Zhejiang University Hangzhou ChinaCollege of Electrical Engineering, Yuquan Campus Zhejiang University Hangzhou ChinaCollege of Electrical Engineering, Yuquan Campus Zhejiang University Hangzhou ChinaCollege of Electrical Engineering, Yuquan Campus Zhejiang University Hangzhou ChinaAbstract Modulation strategy plays an important role in the good performance of modular multilevel converter (MMC). Since MMC has a special structure as well as a large number of submodules (SMs), it is almost impossible to apply the conventional multilevel space vector modulation (SVM) algorithm in it. In this study, a simplified SVM implementation method is proposed by grouping SMs. With the presented method, the high‐level SVM process for MMC can be easily done by implementing multiple two‐level or three‐level SVM algorithm, while the complicated offline or online efforts/tasks about mapping switching states or sequences in the conventional multilevel SVM are not necessary any more. In order to improve the harmonic characteristics, the sampling time of different subunits (SUs), each of which is formed by grouping a few SMs, is staggered evenly, which helps to achieve a higher equivalent switching frequency and less low‐order harmonics. Further, the capacitor voltage balance of SMs is improved by rotation strategies between SUs or inside each SU even without any capacitor voltage detecting or sorting. Since the presented method is independent of the number of SMs, it can be very easily expanded into a high‐level MMC. These propositions are verified by experiment.https://doi.org/10.1049/pel2.12086Power electronics, supply and supervisory circuitsPower engineering computingDC‐AC power convertors (invertors)Support vector machines |
| spellingShingle | Zhihong Bai Haoqi Chen Yifei Li Yinuo Dong Hao Ma A simplified space vector modulation implementation for modular multilevel converter by grouping submodules IET Power Electronics Power electronics, supply and supervisory circuits Power engineering computing DC‐AC power convertors (invertors) Support vector machines |
| title | A simplified space vector modulation implementation for modular multilevel converter by grouping submodules |
| title_full | A simplified space vector modulation implementation for modular multilevel converter by grouping submodules |
| title_fullStr | A simplified space vector modulation implementation for modular multilevel converter by grouping submodules |
| title_full_unstemmed | A simplified space vector modulation implementation for modular multilevel converter by grouping submodules |
| title_short | A simplified space vector modulation implementation for modular multilevel converter by grouping submodules |
| title_sort | simplified space vector modulation implementation for modular multilevel converter by grouping submodules |
| topic | Power electronics, supply and supervisory circuits Power engineering computing DC‐AC power convertors (invertors) Support vector machines |
| url | https://doi.org/10.1049/pel2.12086 |
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