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T-type Three-level Universal Average Circuit Model Controlled by VSG
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Xianyun LI, Yu CHENG, Shuang CHENG, Zixin LIANG, Yuxuan ZHENG
Journal of Power Supply | 2026, 24(2) : 80 - 90
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Journal of Power Supply | 2026, 24(2): 80-90
• Power Converter Modeling and Control •
T-type Three-level Universal Average Circuit Model Controlled by VSG
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Xianyun LI, Yu CHENG, Shuang CHENG, Zixin LIANG, Yuxuan ZHENG
Affiliations
  • School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Published: 2026-02-28 doi: 10.13234/j.issn.2095-2805.2026.2.80
Outline
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The grid-forming photovoltaic systems with traditional three-phase pulse width modulation (PWM) inverters has problems such as large harmonics and low efficiency, and the main modeling research on grid-forming virtual synchronous generator (VSG) control at present does not take into account the influences of inverter topology and multilevel converter on the system stability. Since the T-type three-level has advantages including small harmonics and low switching loss, a universal T-type three-level state space average model applied to grid-forming VSG is proposed. An equivalent controlled source circuit is formed with a substitution of the controlled source by averaging the switching devices in the circuit, and a complete state space equation is established for stability analysis. Finally, simulations and experiments were carried out to verify the adaptability of the established equivalent controlled source model and the actual circuit. Results show that the output characteristics of the VSG mathematical model based on the controlled source are almost consistent with those of the actual model, and it has good stability.

VSG control  /  T-type three-level  /  equivalent controlled source method  /  dynamic modeling  /  participation factor method
李先允, 程煜, 程爽, 梁自鑫, 郑雨萱. 采用VSG控制的T型三电平通用平均电路模型. 电源学报, 2026 , 24 (2) : 80 -90 . DOI: 10.13234/j.issn.2095-2805.2026.2.80
Xianyun LI, Yu CHENG, Shuang CHENG, Zixin LIANG, Yuxuan ZHENG. T-type Three-level Universal Average Circuit Model Controlled by VSG[J]. Journal of Power Supply, 2026 , 24 (2) : 80 -90 . DOI: 10.13234/j.issn.2095-2805.2026.2.80
Funding
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  • 2022 State Key Laboratory Open Project(SGNR0000KJJS2302151)
  • Jiangsu Graduate Research and Practice Innovation Program Project(SJCX22_1077)
Appendix
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Year 2026 volume 24 Issue 2
36
7
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Article Info
doi: 10.13234/j.issn.2095-2805.2026.2.80
  • Receive Date：2023-06-14
  • Online Date：2026-10-29
  • Published：2026-02-28
Article Data
Affiliations
History
  • Received：2023-06-14
  • Revised：2023-08-17
  • Accepted：2023-10-02
Funding
2022 State Key Laboratory Open Project(SGNR0000KJJS2302151)
Jiangsu Graduate Research and Practice Innovation Program Project(SJCX22_1077)
Affiliations
    School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
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