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Research on Carrier Modulation of Three-level Bidirectional DC Converter Based on Neutral Point Shift
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Yangzhou FENG1, Xu YANG2, 3, Haiping ZHANG4, Huiyong LI4
Journal of Power Supply | 2025, 23(3) : 238 - 244
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Journal of Power Supply | 2025, 23(3): 238-244
• DC-DC Converters •
Research on Carrier Modulation of Three-level Bidirectional DC Converter Based on Neutral Point Shift
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Yangzhou FENG1, Xu YANG2, 3, Haiping ZHANG4, Huiyong LI4
Affiliations
  • 1.Construction Department, State Grid Gansu Electric Power Company, Lanzhou 730000, China
  • 2.Department of Computer Science and Technology, School of Electronics and Information Engineering, Tongji University, Shanghai 201804, China
  • 3.The Key Laboratory of Embedded System and Service Computing of Ministry of Education, Tongji University, Shanghai 201804, China
  • 4.Econonic and Technological Research Institute, State Grid Gansu Electric Power Company, Lanzhou 730000, China
Published: 2025-05-30 doi: 10.13234/j.issn.2095-2805.2025.3.238
Outline
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When a three-level bidirectional DC converter is under carrier modulation, the switching between its forward and reverse operations is not smooth and the dynamic response is slow, which will easily cause harmonics in the resonant circuit. To solve these problems, a carrier modulation method for the three-level bidirectional DC converter based on neutral point shift is proposed. The working principle for the bidirectional DC converter is analyzed. Based on the principle of neutral point shift, the phase angle mode of three-phase output voltage from the converter is adjusted. On the basis of constant switching frequency, the neutral point shift voltage with different amplitude modulation ratios is calculated. According to the actual fault state, the shift between adjacent carriers in the same phase unit is rectified, and the carrier phase shift pulse width modulation is used to modulate the carrier of the three-level bidirectional DC converter. Simulation results show that the proposed modulation method can effectively control the output waveform of the three-level bidirectional DC converter. When the converter operates normally, the amplitude modulation ratio is greater than 1.0, the phase voltage is saturated, and the modulation signal is overshoot.

Neutral point shift  /  three-level bidirectional DC converter  /  carrier modulation  /  phase angle mode
冯杨州, 杨旭, 张海平, 李惠庸. 基于中性点移位的三电平双向直流变换器载波调制研究. 电源学报, 2025 , 23 (3) : 238 -244 . DOI: 10.13234/j.issn.2095-2805.2025.3.238
Yangzhou FENG, Xu YANG, Haiping ZHANG, Huiyong LI. Research on Carrier Modulation of Three-level Bidirectional DC Converter Based on Neutral Point Shift[J]. Journal of Power Supply, 2025 , 23 (3) : 238 -244 . DOI: 10.13234/j.issn.2095-2805.2025.3.238
Funding
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  • Science and Technology Project of State Grid Gansu Electric Power Company(SGTYHT/16-JS-198)
Appendix
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Year 2025 volume 23 Issue 3
44
8
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.3.238
  • Receive Date：2022-07-13
  • Online Date：2026-10-26
  • Published：2025-05-30
Article Data
Affiliations
History
  • Received：2022-07-13
  • Revised：2022-09-30
  • Accepted：2022-10-21
Funding
Science and Technology Project of State Grid Gansu Electric Power Company(SGTYHT/16-JS-198)
Affiliations
    1.Construction Department, State Grid Gansu Electric Power Company, Lanzhou 730000, China
    2.Department of Computer Science and Technology, School of Electronics and Information Engineering, Tongji University, Shanghai 201804, China
    3.The Key Laboratory of Embedded System and Service Computing of Ministry of Education, Tongji University, Shanghai 201804, China
    4.Econonic and Technological Research Institute, State Grid Gansu Electric Power Company, Lanzhou 730000, China
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https://castjournals.cast.org.cn/joweb/dyxb/EN/10.13234/j.issn.2095-2805.2025.3.238
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