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Optimized Modulation Strategy for Current Ripple and EMI of Three-level NPC Converter
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Baohui MA1, Ning LI1, 2, Bowen TIAN2, Yan ZHANG3
Journal of Power Supply | 2024, 22(6) : 60 - 68
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Journal of Power Supply | 2024, 22(6): 60-68
• DC-AC Inverters •
Optimized Modulation Strategy for Current Ripple and EMI of Three-level NPC Converter
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Baohui MA1, Ning LI1, 2, Bowen TIAN2, Yan ZHANG3
Affiliations
  • 1 State Key Laboratory of Large Electric Drive System and Equipment Technology, Tianshui Electric Transmission Research Institute Group Co., Ltd Tianshui 741000 China
  • 2 School of Electrical Engineering Xi'an University of Technology Xi'an 710048 China
  • 3 School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 China
Published: 2024-11-30 doi: 10.13234/j.issn.2095-2805.2024.6.60
Outline
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Aimed at the problem that the converter current ripple and electromagnetic interference (EMI) noise will increase due to the increasing switching frequency of a three-level neutral point clamped (NPC) converter, a variable switching frequency modulation strategy based on current ripple prediction is proposed to reduce the current ripple, harmonic noise and EMI noise of the three-level NPC converter. According to the requirements of current ripple, the switching cycle and sampling cycle are calculated to synthesize the latest switching cycle and form feedback, so as to realize variable frequency modulation. The random cycle is distributed around the expected cycle, so that the harmonic noise and electromagnetic noise of the converter are more evenly distributed in a wide frequency band. As a result, the electromagnetic noise of the converter is reduced, and the output inductance current ripple is improved. The relevant simulation and experimental results verified that compared with those under the traditional modulation strategy, the common mode noise was reduced by about 20 dB/µV under the proposed modulation strategy, the differential mode noise was reduced by about 10 dB/µV, and the amplitude of output inductance current ripple was also reduced accordingly.

Three-level neutral point clamped (NPC) converter  /  current ripple prediction  /  electromagnetic interference (EMI)  /  harmonic  /  random SVPWM strategy
Baohui MA, Ning LI, Bowen TIAN, Yan ZHANG. Optimized Modulation Strategy for Current Ripple and EMI of Three-level NPC Converter[J]. Journal of Power Supply, 2024 , 22 (6) : 60 -68 . DOI: 10.13234/j.issn.2095-2805.2024.6.60
Funding
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  • National Natural Science Foundation of China(52177193)
  • International Clean Energy Top Talent Training Project of China Scholarship Council([2018]5046)
  • International Clean Energy Top Talent Training Project of China Scholarship Council([2019]157)
  • Open Fund Project of Jiangsu Distribution Net-work Intelligent Technology and Equipment Collaborative Innovation Center under the grant XTCX202007(XTCX202007)
Appendix
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Year 2024 volume 22 Issue 6
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361
155
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Article Info
doi: 10.13234/j.issn.2095-2805.2024.6.60
  • Receive Date：2021-11-04
  • Online Date：2025-07-19
  • Published：2024-11-30
Article Data
Affiliations
History
  • Received：2021-11-04
  • Revised：2022-03-21
  • Accepted：2022-04-11
Funding
National Natural Science Foundation of China(52177193)
International Clean Energy Top Talent Training Project of China Scholarship Council([2018]5046)
International Clean Energy Top Talent Training Project of China Scholarship Council([2019]157)
Open Fund Project of Jiangsu Distribution Net-work Intelligent Technology and Equipment Collaborative Innovation Center under the grant XTCX202007(XTCX202007)
Affiliations
    1 State Key Laboratory of Large Electric Drive System and Equipment Technology, Tianshui Electric Transmission Research Institute Group Co., Ltd Tianshui 741000 China
    2 School of Electrical Engineering Xi'an University of Technology Xi'an 710048 China
    3 School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 China
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