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Novel Power Equalization Modulation Strategy for Cascaded H-bridge Inverter
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Jun GU, Weiguo ZHANG  Student Member, CPSS, Ping LI, Ming ZHANG, Zhibin DU
Journal of Power Supply | 2025, 23(5) : 42 - 50
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Journal of Power Supply | 2025, 23(5): 42-50
• DC-AC Inverters •
Novel Power Equalization Modulation Strategy for Cascaded H-bridge Inverter
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Jun GU, Weiguo ZHANG  Student Member, CPSS, Ping LI, Ming ZHANG, Zhibin DU
Affiliations
  • School of Electrical and Information Engineering, Anhui University of Science and Technology, Huainan 232001, China
Published: 2025-09-30 doi: 10.13234/j.issn.2095-2805.2025.5.42
Outline
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Under the traditional phase disposition (PD) modulation strategy, there is a power imbalance problem among the units in a cascaded H-bridge inverter. Aimed at this problem, the control principle of freedom degrees is analyzed, and a novel power equalization modulation strategy is proposed. On the basis of ensuring the output power equalization and voltage harmonic characteristics, the power equalization time is shortened, and the complexity in digital control is reduced. On the one hand, the freedom degrees of triangular carriers are recombined based on the PD modulation method to distribute them evenly in different carrier layers. Then, by fully utilizing the switching redundancy state at each output level, the power equalization is achieved within a carrier cycle to shorten the time needed for achieving the equalization. On the other hand, the complexity in digital control is reduced by restructuring the vertical freedom degree of the modulated wave. Finally, the theoretical analysis and feasibility were verified by simulation and experimental results.

Cascade H-bridge  /  modulation strategy  /  power equalization  /  freedom degree  /  power equalization time
顾军, 张维国中国电源学会学生会员, 李平, 张明, 杜治斌. 级联H桥逆变器的新型功率均衡调制策略. 电源学报, 2025 , 23 (5) : 42 -50 . DOI: 10.13234/j.issn.2095-2805.2025.5.42
Jun GU, Weiguo ZHANG, Ping LI, Ming ZHANG, Zhibin DU. Novel Power Equalization Modulation Strategy for Cascaded H-bridge Inverter[J]. Journal of Power Supply, 2025 , 23 (5) : 42 -50 . DOI: 10.13234/j.issn.2095-2805.2025.5.42
Funding
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  • Natural Science Foundation of Anhui Province(2108085ME180)
Appendix
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Year 2025 volume 23 Issue 5
44
4
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.5.42
  • Receive Date：2022-08-01
  • Online Date：2026-10-26
  • Published：2025-09-30
Article Data
Affiliations
History
  • Received：2022-08-01
  • Revised：2022-09-11
  • Accepted：2022-10-21
Funding
Natural Science Foundation of Anhui Province(2108085ME180)
Affiliations
    School of Electrical and Information Engineering, Anhui University of Science and Technology, Huainan 232001, China
References
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