Journal of South China University of Technology(Natural Science Edition) ›› 2018, Vol. 46 ›› Issue (1): 33-40.doi: 10.3969/j.issn.1000-565X.2018.01.005

• Power & Electrical Engineering • Previous Articles     Next Articles

The Neutral Point Potential Regulation of Three-Level Inverter Based on the Deadbeat Control Algorithm

YAO Yuan1,2 KANG Longyun1,2 ZHANG Zhi3 FENG Yuanbin1,2 CHENG Jiancai1,2    

  1. 1． School of Electric Power，South China University of Technology，Guangzhou 510640，Guangdong，China; 2． Key Laboratory of Clean Energy Technology of Guangdong Province，South China University of Technology，Guangzhou 510640，Guangdong，China; 3． School of Electrical Engineering ＆ Intelligentization，Dongguan University of Technology，Dongguan 523808，Guangdong，China
  • Received:2017-03-08 Revised:2017-09-11 Online:2018-01-25 Published:2017-12-01
  • Contact: 康龙云(1961-)，男，教授，博士生导师，主要从事电力电子技术，新能源系统技术的研究与开发等研究． E-mail:lykang@scut.edu.cn
  • About author:姚远(1990-)，男，博士生，主要从事变流器方面的研究． E-mail:Heinzyao@ outlook． com
  • Supported by:
    Supported by the Project of Public Welfare Research and Capacity Building of Gunagdong Province(2015A010106018)

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Abstract: In this paper an exploration is performed into midpoint potential migration of NPC three-level inverter and the midpoint potential fluctuation． On the basis of the analysis of the voltage vectors and the midpoint potential，a mathematical model is constructed under the deadbeat control framework． In order to keep the ability to fix the drifted midpoint potential，the virtual voltage vector method is employed． In the proposed algorithm，the vectors applied to modify the midpoint potential are evaluated accordingly． Compared with the conventional algorithm，the time needed to fix the midpoint potential is decreased in this proposed algorithm，and the ability to fix the midpoint potential is in-sensitive to the modulation index． Moreover，the proposed algorithm can eliminate the oscillation of the midpoint po-tential． The validity of the proposed algorithm is verified by the simulation and experiments．

Key words: NPC, three-level inverter, deadbeat control, virtual vector, neutral point potential drifted, neutral point potential oscillation

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