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Predictive Fault-tolerant Control Strategy Based on Model with Fixed Number of Calculations for MMC Converter without Redundant Submodules
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Chengshun YANG1, Chenxi ZHANG1, Dezhi XU  Member, CPSS2, Kunshan XU3, Binfeng ZHANG3
Journal of Power Supply | 2025, 23(8) : 82 - 92
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Journal of Power Supply | 2025, 23(8): 82-92
• AC-DC Converters •
Predictive Fault-tolerant Control Strategy Based on Model with Fixed Number of Calculations for MMC Converter without Redundant Submodules
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Chengshun YANG1, Chenxi ZHANG1, Dezhi XU  Member, CPSS2, Kunshan XU3, Binfeng ZHANG3
Affiliations
  • 1.School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
  • 2.School of Electrical Engineering, Southeast University, Nanjing 210096, China
  • 3.Industrial Center, Nanjing Institute of Technology, Nanjing 211167, China
Published: 2025-12-30 doi: 10.13234/j.issn.2095-2805.2025.8.82
Outline
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To address the challenges of a modular multilevel converter (MMC) without redundant submodules when using the traditional PI control method for fault-tolerant control, which include excessive control parameters, complex structure and slow dynamic responses, a model with a fixed number of calculations for implementing the fault-tolerant control by fault prediction is proposed. First, the AC current is optimized. Then, multi-objective optimization on the circulating current and the total voltage of submodule capacitors is performed, and the balance of submodule voltage is realized based on the direction and level difference of bridge arm current. With only eight times of rolling optimization, the optimal solution can be found under this strategy, significantly reducing the computational requirements. In addition, this algorithm not only can ensure that the MMC operates stably and has high-quality output under normal conditions, but also can maintain its stable operation when the submodule experiences an asymmetric fault. Simulation tests were completed in MATLAB/SIMULINK, and a five-level experimental platform was built to verify the simulation and test results.

Modular multilevel converter (MMC)  /  submodule failure  /  model predictive control  /  circulating current suppression  /  fault-tolerant
杨成顺, 张晨曦, 许德智中国电源学会会员, 徐坤山, 张斌锋. 基于无冗余子模块MMC变换器的固定计算次数模型预测容错控制策略. 电源学报, 2025 , 23 (8) : 82 -92 . DOI: 10.13234/j.issn.2095-2805.2025.8.82
Chengshun YANG, Chenxi ZHANG, Dezhi XU, Kunshan XU, Binfeng ZHANG. Predictive Fault-tolerant Control Strategy Based on Model with Fixed Number of Calculations for MMC Converter without Redundant Submodules[J]. Journal of Power Supply, 2025 , 23 (8) : 82 -92 . DOI: 10.13234/j.issn.2095-2805.2025.8.82
Funding
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  • National Natural Science Foundation of China(62222307; 61973140)
Appendix
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Year 2025 volume 23 Issue 8
38
6
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.8.82
  • Receive Date：2024-08-07
  • Online Date：2026-10-26
  • Published：2025-12-30
Article Data
Affiliations
History
  • Received：2024-08-07
  • Revised：2024-10-03
  • Accepted：2024-11-03
Funding
National Natural Science Foundation of China(62222307; 61973140)
Affiliations
    1.School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
    2.School of Electrical Engineering, Southeast University, Nanjing 210096, China
    3.Industrial Center, Nanjing Institute of Technology, Nanjing 211167, China
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