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GUO Yougui,WANG Zhen,DENG Wenlang,LI Lijuan,HUANG Songtao.Novel Strategy of Space Vector Modulation for Z-source Inverter[J].JOURNAL OF POWER SUPPLY,2019,17(1):37-44
Novel Strategy of Space Vector Modulation for Z-source Inverter
Received:December 27, 2016  Revised:February 25, 2018
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DOI:10.13234/j.issn.2095-2805.2019.1.37
Keywords:Z-source inverter  novel modulation strategy  space vector modulation  shoot-through zero vector
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AuthorInstitutionEmail
GUO Yougui College of Information Engineering, Xiangtan University, Xiangtan , China
WANG Zhen College of Information Engineering, Xiangtan University, Xiangtan , China wangzhen405899750@163.com
DENG Wenlang College of Information Engineering, Xiangtan University, Xiangtan , China
LI Lijuan College of Information Engineering, Xiangtan University, Xiangtan , China
HUANG Songtao College of Information Engineering, Xiangtan University, Xiangtan , China
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Abstract:
      Compared with the traditional inverter, Z-source inverter(ZSI) can allow inverter bridges in the shoot-thro-ugh state, and it can achieve the buck-boost conversion of DC input voltage by controlling the time of shoot-through state in one cycle. First, two improved topologies of ZSI are analyzed, and their operating principles are illustrated in detail. Then, the space vector modulation method for ZSI is elaborated, and then a novel modulation strategy based on the working time distribution of the shoot-through zero vector is presented, which can make full use of the traditional zero vector. Moreover, the switch table can be optimized to reduce loss and achieve the maximum boosting, thus improving the performance of the inverter sufficiently. Next, the main circuit model is built based on the simulation platform of Matlab/Simulink, and the novel modulation strategy is realized by S-function modeling method based on C language programming to conduct simulation experiments. Finally, a small power prototype controlled by DSP TMS320F28335 was designed to perform experimental verification. The experimental waveforms verified the advantages of the improved topologies well, which fully validated the feasibility and boosting efficiency of the novel strategy.
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