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A Fault-tolerant Operation Strategy for Cascaded H-bridge Inverters Aimed at Reducing Common-mode Voltage
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Liu YANG, Hai HUANG  Student Member, CPSS, Ronglu QIU, Hanyu WANG  Member, CPSS, Xing ZHANG  Senior Member, CPSS
Journal of Power Supply | 2026, 24(9) : 351 - 359
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Journal of Power Supply | 2026, 24(9): 351-359
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A Fault-tolerant Operation Strategy for Cascaded H-bridge Inverters Aimed at Reducing Common-mode Voltage
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Liu YANG, Hai HUANG  Student Member, CPSS, Ronglu QIU, Hanyu WANG  Member, CPSS, Xing ZHANG  Senior Member, CPSS
Affiliations
  • National and Local Joint Engineering Laboratory for Renewable Energy Access to Grid Technology (Hefei University of Technology), Hefei 230009, China
Published: 2026-09-30 doi: 10.13234/j.issn.2095-2805.2026.9.351
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Cascaded H-bridge (CHB) inverters require common-mode voltage (CMV) injection for fault-tolerant operation, which enables the inverter to maintain balanced line-to-line voltage after a fault without additional hardware costs. However, it can potentially lead to unbalanced power in a three-phase system, leading to reverse power flow, which is unwanted in applications. To mitigate these side-effects, a method for injecting CMV that combines the third harmonic and an alternating clamping algorithm is proposed to minimize the fundamental common-mode voltage (FCMV). The approach starts by using alternating clamping to determine CMV, thereby increasing the output voltage of the faulty phase and reducing CMV. Subsequently, the third harmonic is injected to expand the linear modulation region of the CMV, thereby increasing the maximum line-to-line voltage limit achievable without CMV injection. This optimization mitigates the limitation that smaller line-to-line voltages require larger CMV injection of the proposed method. The proposed fault-tolerant operation strategy demonstrates simple calculations and a reduced FCMV, enhancing converter performance after a fault. Simulations and experiments confirm the effectiveness of this method.

Cascaded H-bridge (CHB)  /  common-mode voltage (CMV)  /  fault-tolerant operation  /  third harmonic
杨柳, 黄海中国电源学会学生会员, 邱荣禄, 王涵宇中国电源学会会员, 张兴中国电源学会高级会员. 一种减小共模电压的级联H桥逆变器容错运行策略. 电源学报, 2026 , 24 (9) : 351 -359 . DOI: 10.13234/j.issn.2095-2805.2026.9.351
Liu YANG, Hai HUANG, Ronglu QIU, Hanyu WANG, Xing ZHANG. A Fault-tolerant Operation Strategy for Cascaded H-bridge Inverters Aimed at Reducing Common-mode Voltage[J]. Journal of Power Supply, 2026 , 24 (9) : 351 -359 . DOI: 10.13234/j.issn.2095-2805.2026.9.351
Funding
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  • National Natural Science Foundation of China(52107187)
Appendix
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Year 2026 volume 24 Issue 9
53
8
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Article Info
doi: 10.13234/j.issn.2095-2805.2026.9.351
  • Receive Date：2024-11-28
  • Online Date：2026-10-29
  • Published：2026-09-30
Article Data
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History
  • Received：2024-11-28
  • Accepted：2025-02-05
Funding
National Natural Science Foundation of China(52107187)
Affiliations
    National and Local Joint Engineering Laboratory for Renewable Energy Access to Grid Technology (Hefei University of Technology), Hefei 230009, China
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