A variable frequency injection method for modular multilevel converters in variable speed drives
Modular multilevel converter (MMC) is a novel circuit that has appeared in the last few decades, and has been extensively applied to medium/high voltage scenarios, especially in motor drive owing to its scalability and easy to supply a higher number of output voltage levels. As theoretical analysis...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-09-01
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| Series: | Energy Reports |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352484723005607 |
| _version_ | 1827824094194696192 |
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| author | Guanlong Jia Mingshuo Li Binhao Shi Xinchao Yu Xiaoming Liu |
| author_facet | Guanlong Jia Mingshuo Li Binhao Shi Xinchao Yu Xiaoming Liu |
| author_sort | Guanlong Jia |
| collection | DOAJ |
| description | Modular multilevel converter (MMC) is a novel circuit that has appeared in the last few decades, and has been extensively applied to medium/high voltage scenarios, especially in motor drive owing to its scalability and easy to supply a higher number of output voltage levels. As theoretical analysis shows, the sub-module (SM) capacitor voltage magnitude is positively related to the converter output current amplitude and conversely connected to the fundamental frequency. Therefore, the prime challenge of applying MMC to variable speed drives is that there is a huge voltage oscillation in SM capacitor voltage during low-speed working. An innovative high-frequency voltage injection modality to diminish the fluctuation of the capacitor voltage in variable speed drives is proposed in this paper, in which the frequency of the injected component can be changed with the operating frequency of the converter and the low frequency component of power can be converted into high frequency component. The discussed measure not only significantly reduces the voltage float in capacitor, but also avoids the overmodulation of arm voltage modulation waveform caused by high frequency of injection component when converter works in low frequency. With the improved method, the performance of motor at low frequency is enhanced. Finally, the feasibility and effectiveness of the proposed improved high-frequency voltage injection method are verified by simulation and experiment. |
| first_indexed | 2024-03-12T02:21:06Z |
| format | Article |
| id | doaj.art-576007f7e47e4e26866b09d361344de5 |
| institution | Directory Open Access Journal |
| issn | 2352-4847 |
| language | English |
| last_indexed | 2024-03-12T02:21:06Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Energy Reports |
| spelling | doaj.art-576007f7e47e4e26866b09d361344de52023-09-06T04:52:08ZengElsevierEnergy Reports2352-48472023-09-019939947A variable frequency injection method for modular multilevel converters in variable speed drivesGuanlong Jia0Mingshuo Li1Binhao Shi2Xinchao Yu3Xiaoming Liu4Corresponding author.; State Key Lab of Reliability and Intelligence of Electrical Equipment, HeBei University of Technology, Tianjin, 300401, ChinaState Key Lab of Reliability and Intelligence of Electrical Equipment, HeBei University of Technology, Tianjin, 300401, ChinaState Key Lab of Reliability and Intelligence of Electrical Equipment, HeBei University of Technology, Tianjin, 300401, ChinaState Key Lab of Reliability and Intelligence of Electrical Equipment, HeBei University of Technology, Tianjin, 300401, ChinaState Key Lab of Reliability and Intelligence of Electrical Equipment, HeBei University of Technology, Tianjin, 300401, ChinaModular multilevel converter (MMC) is a novel circuit that has appeared in the last few decades, and has been extensively applied to medium/high voltage scenarios, especially in motor drive owing to its scalability and easy to supply a higher number of output voltage levels. As theoretical analysis shows, the sub-module (SM) capacitor voltage magnitude is positively related to the converter output current amplitude and conversely connected to the fundamental frequency. Therefore, the prime challenge of applying MMC to variable speed drives is that there is a huge voltage oscillation in SM capacitor voltage during low-speed working. An innovative high-frequency voltage injection modality to diminish the fluctuation of the capacitor voltage in variable speed drives is proposed in this paper, in which the frequency of the injected component can be changed with the operating frequency of the converter and the low frequency component of power can be converted into high frequency component. The discussed measure not only significantly reduces the voltage float in capacitor, but also avoids the overmodulation of arm voltage modulation waveform caused by high frequency of injection component when converter works in low frequency. With the improved method, the performance of motor at low frequency is enhanced. Finally, the feasibility and effectiveness of the proposed improved high-frequency voltage injection method are verified by simulation and experiment.http://www.sciencedirect.com/science/article/pii/S2352484723005607Modular multilevel converter (MMC)Variable-speed drivesVoltage ripplesVariable high-frequency injection |
| spellingShingle | Guanlong Jia Mingshuo Li Binhao Shi Xinchao Yu Xiaoming Liu A variable frequency injection method for modular multilevel converters in variable speed drives Energy Reports Modular multilevel converter (MMC) Variable-speed drives Voltage ripples Variable high-frequency injection |
| title | A variable frequency injection method for modular multilevel converters in variable speed drives |
| title_full | A variable frequency injection method for modular multilevel converters in variable speed drives |
| title_fullStr | A variable frequency injection method for modular multilevel converters in variable speed drives |
| title_full_unstemmed | A variable frequency injection method for modular multilevel converters in variable speed drives |
| title_short | A variable frequency injection method for modular multilevel converters in variable speed drives |
| title_sort | variable frequency injection method for modular multilevel converters in variable speed drives |
| topic | Modular multilevel converter (MMC) Variable-speed drives Voltage ripples Variable high-frequency injection |
| url | http://www.sciencedirect.com/science/article/pii/S2352484723005607 |
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