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MA Li,WEI Jincheng,QIU Xiaochu,WEI Li.Research on Novel Z-source Asymmetric Three-level Inverter and Neutral-point Potential Control Method[J].JOURNAL OF POWER SUPPLY,2018,16(3):120-127
Research on Novel Z-source Asymmetric Three-level Inverter and Neutral-point Potential Control Method
Received:June 12, 2016  Revised:March 27, 2018
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DOI:10.13234/j.issn.2095-2805.2018.3.120
Keywords:Z-source inverter  asymmetric bridge-arm  three-level inverter  space vector pulse width modulation (SVPWM)  neutral-point potential balance
Fund Project:The Key Discipline of Sichuan Province Funded(SZD0503-09-0)
           
AuthorInstitutionEmail
MA Li School of Electrical Engineering and Electronic Information, Xihua University, Chengdu , China
WEI Jincheng School of Electrical Engineering and Electronic Information, Xihua University, Chengdu , China
QIU Xiaochu School of Electrical Engineering and Electronic Information, Xihua University, Chengdu , China
WEI Li School of Electrical Engineering and Electronic Information, Xihua University, Chengdu , China
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Abstract:
      The main circuit of a single Z-source neutral-point-clamped(NPC) three-level inverter requires numerous elements, which results in higher hardware cost. To overcome these disadvantages, a novel topological structure of Z-source asymmetric three-level inverter is proposed, which does not need any clamp diode while maintaining the inherent advantages of Z-source three-level inverters. According to its unique insertion laws of upper and lower shoot-through states as well as its influence on the neutral-point potential, a kind of optimal space vector pulse width modulation(SVPWM) control strategy is proposed. By adjusting the upper and lower shoot-through time, the novel inverter not only maintains the desired boosted DC output voltage, but also effectively restrains the offset of neutral-point potential; meanwhile, the switching loss resulting from the shoot-through action is reduced to a maximum extent. Through simulations in MATLAB/Simulink, the feasibility and effectiveness of the proposed method is verified.
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