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Modulation Strategy for Power Balance of Hybrid Nine-level Inverter
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Jun GU, Zhibin DU, Ping LI, Fei SONG, Weiguo ZHANG, Ming ZHANG
Journal of Power Supply | 2025, 23(1) : 67 - 75
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Journal of Power Supply | 2025, 23(1): 67-75
• DC-AC Inverters •
Modulation Strategy for Power Balance of Hybrid Nine-level Inverter
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Jun GU, Zhibin DU, Ping LI, Fei SONG, Weiguo ZHANG, Ming ZHANG
Affiliations
  • School of Electrical and Information Engineering, Auhui University of Science and Technology, Huainan 232001, China
Published: 2025-01-30 doi: 10.13234/j.issn.2095-2805.2025.1.67
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For a hybrid cascade H-bridge inverter with a DC-side voltage ratio of 1:1:2, if the hybrid carrier disp-osition modulation strategy is adopted, the problem of output power imbalance in the low-voltage unit will occur al-though there is no current backflow phenomenon and the harmonic performance of output voltage is good. To solve this problem, the power imbalance is analyzed at first. Then, an improved hybrid modulation strategy is proposed, under which the high-voltage unit performs step wave modulation and the low-voltage unit performs PWM, and two low-voltage units adopt different processing methods for the modulation wave. The good harmonic performance of output voltage is kept, the number of triangular carriers is reduced, and the control process is simplified, with a frequency doubling effect. Third, this strategy is optimized, and the switching signal of low-voltage unit is logically calculated, which can solve the power imbalance problem of low-voltage unit in two carrier cycles. Finally, the feasibility was proved by simulation and experimental results.

Inverter  /  hybrid modulation  /  triangular carrier  /  logical operation  /  power balance  /  harmonic content
Jun GU, Zhibin DU, Ping LI, Fei SONG, Weiguo ZHANG, Ming ZHANG. Modulation Strategy for Power Balance of Hybrid Nine-level Inverter[J]. Journal of Power Supply, 2025 , 23 (1) : 67 -75 . DOI: 10.13234/j.issn.2095-2805.2025.1.67
Funding
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  • National Natural Science Foundation of China(51607003)
Appendix
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Year 2025 volume 23 Issue 1
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.1.67
  • Receive Date：2022-03-01
  • Online Date：2025-07-01
  • Published：2025-01-30
Article Data
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History
  • Received：2022-03-01
  • Revised：2022-04-29
  • Accepted：2022-05-24
Funding
National Natural Science Foundation of China(51607003)
Affiliations
    School of Electrical and Information Engineering, Auhui University of Science and Technology, Huainan 232001, China
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