A Circulating Current Suppression Strategy for MMC Based on the 2<i>N</i>+1 PWM Approach
Compared with other topologies, the modular multilevel converter (MMC) has the advantages of higher scalability and lower harmonic distortion. When carrier-based pulse-width modulation approaches are used for the MMC, the number of carriers increases for more sub-modules, and the complexity of the c...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Series: | World Electric Vehicle Journal |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2032-6653/14/4/106 |
| _version_ | 1797603135954354176 |
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| author | Guozheng Zhang Jiahui Song Chen Li Xin Gu |
| author_facet | Guozheng Zhang Jiahui Song Chen Li Xin Gu |
| author_sort | Guozheng Zhang |
| collection | DOAJ |
| description | Compared with other topologies, the modular multilevel converter (MMC) has the advantages of higher scalability and lower harmonic distortion. When carrier-based pulse-width modulation approaches are used for the MMC, the number of carriers increases for more sub-modules, and the complexity of the control and the memory required increases as a result. In addition, the synchronization of several carriers is another issue. Due to the unique constructional characteristics of the MMC, circulating currents will be generated internally, causing distortions in the arm currents and, thus, unnecessary converter losses. In this paper, an improved 2<i>N</i>+1 pulse-width modulation approach with low control complexity and a circulating current suppression strategy are proposed. Firstly, the conventional carrier phase-shifted 2<i>N</i>+1 pulse-width modulation approach is improved so that the number of carrier signals adopted in each arm is always two. Secondly, the redundant switching states are used to suppress the circulating current. Finally, the effectiveness of the proposed strategy is verified experimentally. The results show that the proposed method reduces the control complexity while retaining the output performance. Meanwhile, the circulating current can be suppressed. |
| first_indexed | 2024-03-11T04:25:06Z |
| format | Article |
| id | doaj.art-65e52bb79b6348ad918ea27db572fcfd |
| institution | Directory Open Access Journal |
| issn | 2032-6653 |
| language | English |
| last_indexed | 2024-03-11T04:25:06Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | World Electric Vehicle Journal |
| spelling | doaj.art-65e52bb79b6348ad918ea27db572fcfd2023-11-17T21:50:16ZengMDPI AGWorld Electric Vehicle Journal2032-66532023-04-0114410610.3390/wevj14040106A Circulating Current Suppression Strategy for MMC Based on the 2<i>N</i>+1 PWM ApproachGuozheng Zhang0Jiahui Song1Chen Li2Xin Gu3School of Electrical Engineering, Tiangong University, Tianjin 300387, ChinaSchool of Electrical Engineering, Tiangong University, Tianjin 300387, ChinaAdvanced Electrical Equipment Innovation Center, Zhejiang University, Hangzhou 311107, ChinaSchool of Electrical Engineering, Tiangong University, Tianjin 300387, ChinaCompared with other topologies, the modular multilevel converter (MMC) has the advantages of higher scalability and lower harmonic distortion. When carrier-based pulse-width modulation approaches are used for the MMC, the number of carriers increases for more sub-modules, and the complexity of the control and the memory required increases as a result. In addition, the synchronization of several carriers is another issue. Due to the unique constructional characteristics of the MMC, circulating currents will be generated internally, causing distortions in the arm currents and, thus, unnecessary converter losses. In this paper, an improved 2<i>N</i>+1 pulse-width modulation approach with low control complexity and a circulating current suppression strategy are proposed. Firstly, the conventional carrier phase-shifted 2<i>N</i>+1 pulse-width modulation approach is improved so that the number of carrier signals adopted in each arm is always two. Secondly, the redundant switching states are used to suppress the circulating current. Finally, the effectiveness of the proposed strategy is verified experimentally. The results show that the proposed method reduces the control complexity while retaining the output performance. Meanwhile, the circulating current can be suppressed.https://www.mdpi.com/2032-6653/14/4/106modular multilevel converter (MMC)pulse-width modulationcirculating current |
| spellingShingle | Guozheng Zhang Jiahui Song Chen Li Xin Gu A Circulating Current Suppression Strategy for MMC Based on the 2<i>N</i>+1 PWM Approach World Electric Vehicle Journal modular multilevel converter (MMC) pulse-width modulation circulating current |
| title | A Circulating Current Suppression Strategy for MMC Based on the 2<i>N</i>+1 PWM Approach |
| title_full | A Circulating Current Suppression Strategy for MMC Based on the 2<i>N</i>+1 PWM Approach |
| title_fullStr | A Circulating Current Suppression Strategy for MMC Based on the 2<i>N</i>+1 PWM Approach |
| title_full_unstemmed | A Circulating Current Suppression Strategy for MMC Based on the 2<i>N</i>+1 PWM Approach |
| title_short | A Circulating Current Suppression Strategy for MMC Based on the 2<i>N</i>+1 PWM Approach |
| title_sort | circulating current suppression strategy for mmc based on the 2 i n i 1 pwm approach |
| topic | modular multilevel converter (MMC) pulse-width modulation circulating current |
| url | https://www.mdpi.com/2032-6653/14/4/106 |
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