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Harmonic Emission Mechanism and Suppression Strategy for Three-level Converter in Three-phase-four-wire System: Analysis of Neutral-point Voltage Fluctuations and Switching Dead-time
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Zhenhong LAI  Student Member, CPSS1, Zebin YANG  Member, CPSS1, Hao YI  Member, CPSS1, Xiaobin MU2, Yang LIU3, Wenbin LIU3
Journal of Power Supply | 2025, 23(3) : 126 - 137
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Journal of Power Supply | 2025, 23(3): 126-137
• Special Issue on Analysis and Control of Power Quality in New Power Systems •
Harmonic Emission Mechanism and Suppression Strategy for Three-level Converter in Three-phase-four-wire System: Analysis of Neutral-point Voltage Fluctuations and Switching Dead-time
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Zhenhong LAI  Student Member, CPSS1, Zebin YANG  Member, CPSS1, Hao YI  Member, CPSS1, Xiaobin MU2, Yang LIU3, Wenbin LIU3
Affiliations
  • 1.School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
  • 2.China Electric Power Research Institute, Beijing 100192, China
  • 3.Electric Power Research Institute, State Grid Shandong Electric Power Company, Ji’nan 250003, China
Published: 2025-05-30 doi: 10.13234/j.issn.2095-2805.2025.3.126
Outline
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The neutral-point clamped (NPC) three-level converter is extensively used in low-voltage distribution networks with distributed energy resources. In a three-phase-four-wire system, the DC bus neutral-point (NP) of a three-phase converter is commonly connected to the N-wire, creating a zero-sequence current path in the system. This configuration leads to output voltage distortions caused by DC NP voltage fluctuations and switching dead-time, and further causes harmonic emission from the converter itself. First, the coupling relationship between NP voltage fluctuations and output current is analyzed, laying a foundation for establishing a quantitative model of NP voltage fluctuations. Based on this model, an active filtering circuit control system for DC bus is designed to suppress both the NP voltage fluctuations and the induced harmonics. Then, the influence of switching dead-time under various operating conditions of the three-phase converter is investigated. A quantitative relationship between the switching dead-time and output voltage distortions is derived, guiding the design of a modulation wave compensation strategy for mitigating the harmonic emission caused by switching dead-time. Finally, simulation models and an experimental platform were developed to reproduce the harmonic emission issues of the three-phase converter, and results validated the effectiveness of the proposed scheme.

Neutral-point clamped (NPC) three-level converter  /  three-phase-four-wire system  /  harmonic emission  /  neutral-point (NP) voltage fluctuation  /  switching dead-time
赖振宏中国电源学会学生会员, 杨泽斌中国电源学会会员, 易皓中国电源学会会员, 慕小斌, 刘洋, 刘文彬. 三相四线系统三电平变流器谐波发射机理及抑制策略——中点电位波动和开关死区问题分析. 电源学报, 2025 , 23 (3) : 126 -137 . DOI: 10.13234/j.issn.2095-2805.2025.3.126
Zhenhong LAI, Zebin YANG, Hao YI, Xiaobin MU, Yang LIU, Wenbin LIU. Harmonic Emission Mechanism and Suppression Strategy for Three-level Converter in Three-phase-four-wire System: Analysis of Neutral-point Voltage Fluctuations and Switching Dead-time[J]. Journal of Power Supply, 2025 , 23 (3) : 126 -137 . DOI: 10.13234/j.issn.2095-2805.2025.3.126
Funding
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  • Science and Technology Project of State Grid Corporation of China(5400-202316216A-1-1-ZN)
Appendix
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Year 2025 volume 23 Issue 3
65
8
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.3.126
  • Receive Date：2024-11-30
  • Online Date：2026-10-26
  • Published：2025-05-30
Article Data
Affiliations
History
  • Received：2024-11-30
  • Revised：2025-02-11
  • Accepted：2025-03-05
Funding
Science and Technology Project of State Grid Corporation of China(5400-202316216A-1-1-ZN)
Affiliations
    1.School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
    2.China Electric Power Research Institute, Beijing 100192, China
    3.Electric Power Research Institute, State Grid Shandong Electric Power Company, Ji’nan 250003, China
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