A Modulation Strategy for Suppressing Current Ripple in H7 Current Source Inverters Through Coordinated Switching Operations
The DC bus current ripple is a critical performance parameter affecting the operation of current source inverters (CSIs). In high-power applications, CSIs often operate at lower switching frequencies to minimize losses. However, maintaining low levels of DC bus current ripple necessitates the use of...
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MDPI AG
2025-01-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/18/2/340 |
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| author | Weiqi Wang Longfei Wei Xupeng Fang Xi Liang Kun Li Xiaoting Xia |
| author_facet | Weiqi Wang Longfei Wei Xupeng Fang Xi Liang Kun Li Xiaoting Xia |
| author_sort | Weiqi Wang |
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| description | The DC bus current ripple is a critical performance parameter affecting the operation of current source inverters (CSIs). In high-power applications, CSIs often operate at lower switching frequencies to minimize losses. However, maintaining low levels of DC bus current ripple necessitates the use of large inductors on the DC side, which increases the size, weight, and cost of the system. This paper first explores the inherent limitations of conventional CSI designs. Subsequently, it proposes a hierarchical coordinated switching modulation strategy based on the H7 current source inverter (H7-CSI) to address the issue of DC bus current ripple. By segmenting the zero-vector states, the proposed method fully utilizes the modulation freedom of the H7-CSI, achieving high-frequency chopping effects on the DC-side current. Experimental results show that the new modulation strategy reduces the amplitude of DC bus current ripple to 43% of that achieved by conventional CSIs under similar switching loss conditions. Furthermore, the dynamic performance of the proposed scheme remains consistent with conventional CSIs. Spectrally, this method exhibits improved performance in the low-frequency range and slightly degraded performance in the high-frequency range, although the latter remains within acceptable limits. |
| format | Article |
| id | doaj-art-4d8d4cae9aa345f7b263eb7b708ee07f |
| institution | Kabale University |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-4d8d4cae9aa345f7b263eb7b708ee07f2025-01-24T13:31:07ZengMDPI AGEnergies1996-10732025-01-0118234010.3390/en18020340A Modulation Strategy for Suppressing Current Ripple in H7 Current Source Inverters Through Coordinated Switching OperationsWeiqi Wang0Longfei Wei1Xupeng Fang2Xi Liang3Kun Li4Xiaoting Xia5College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, ChinaPipeChina Northwest Company, Xi’an 710000, ChinaSchool of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaCollege of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, ChinaThe DC bus current ripple is a critical performance parameter affecting the operation of current source inverters (CSIs). In high-power applications, CSIs often operate at lower switching frequencies to minimize losses. However, maintaining low levels of DC bus current ripple necessitates the use of large inductors on the DC side, which increases the size, weight, and cost of the system. This paper first explores the inherent limitations of conventional CSI designs. Subsequently, it proposes a hierarchical coordinated switching modulation strategy based on the H7 current source inverter (H7-CSI) to address the issue of DC bus current ripple. By segmenting the zero-vector states, the proposed method fully utilizes the modulation freedom of the H7-CSI, achieving high-frequency chopping effects on the DC-side current. Experimental results show that the new modulation strategy reduces the amplitude of DC bus current ripple to 43% of that achieved by conventional CSIs under similar switching loss conditions. Furthermore, the dynamic performance of the proposed scheme remains consistent with conventional CSIs. Spectrally, this method exhibits improved performance in the low-frequency range and slightly degraded performance in the high-frequency range, although the latter remains within acceptable limits.https://www.mdpi.com/1996-1073/18/2/340current source invertercurrent ripplemodulation |
| spellingShingle | Weiqi Wang Longfei Wei Xupeng Fang Xi Liang Kun Li Xiaoting Xia A Modulation Strategy for Suppressing Current Ripple in H7 Current Source Inverters Through Coordinated Switching Operations Energies current source inverter current ripple modulation |
| title | A Modulation Strategy for Suppressing Current Ripple in H7 Current Source Inverters Through Coordinated Switching Operations |
| title_full | A Modulation Strategy for Suppressing Current Ripple in H7 Current Source Inverters Through Coordinated Switching Operations |
| title_fullStr | A Modulation Strategy for Suppressing Current Ripple in H7 Current Source Inverters Through Coordinated Switching Operations |
| title_full_unstemmed | A Modulation Strategy for Suppressing Current Ripple in H7 Current Source Inverters Through Coordinated Switching Operations |
| title_short | A Modulation Strategy for Suppressing Current Ripple in H7 Current Source Inverters Through Coordinated Switching Operations |
| title_sort | modulation strategy for suppressing current ripple in h7 current source inverters through coordinated switching operations |
| topic | current source inverter current ripple modulation |
| url | https://www.mdpi.com/1996-1073/18/2/340 |
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