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HE Lili,SHUAI Zhikang,SHAN Jiajia.Contrastive Analysis of Multi-carrier Modulation Strategy for Modular Multi-level Converter[J].JOURNAL OF POWER SUPPLY,2019,17(5):56-64
Contrastive Analysis of Multi-carrier Modulation Strategy for Modular Multi-level Converter
Received:July 14, 2017  Revised:October 23, 2018
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DOI:10.13234/j.issn.2095-2805.2019.5.56
Keywords:modular multi-level converter(MMC)  carrier phase shifted PWM  level-shifted PWM  harmonic distortion rate  equivalent switching frequency
Fund Project:The National Natural Science Foundation of China(51622702); The Higher National Excellent Doctoral Dissertation of Special Funds(201441)
        
AuthorInstitutionEmail
HE Lili College of Electrical and Information Engineering, Hunan University, Changsha , China lilyheliu@foxmail.com
SHUAI Zhikang College of Electrical and Information Engineering, Hunan University, Changsha , China
SHAN Jiajia Automotive Engineering Institute, Guangzhou Automobile, Guangzhou , China
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Abstract:
      Compared with the traditional direct current(DC) transmission technology, the high-voltage DC transmi-ssion system based on the modular multi-level converter(MMC-HVDC), which features high-quality AC output voltage wa-veform and satisfying scalability, is suitable for multi-level voltage and power applications. Since the modulation strategy for MMC has a great effect on the MMC system's output quality, the related study is necessary. First, the working principles of carrier phase shifted pulse width modulation(CPS-PWM) and three kinds of cascading methods for level-shifted PWM(LS-PWM), which can be applied to MMC, are introduced. Second, four kinds of modulation strategies, i.e., CPS-PWM, phase disposition pulse width modulation(PD-PWM), phase opposition disposition pulse width modulation(POD-PWM), and alternative phase opposition disposition pulse width modulation(APOD-PWM), are compared and analyzed in depth. Especially, the performances of these four modulation strategies are compared from aspects including the output phase voltage harmonic distortion rate and equivalent switching frequency, and their characteristics and application scenarios are summarized. Finally, a single-ended three-phase passive inverter MMC system is built in Matlab/Simulink to compare and analyze these four modulation strategies, and results verify the theoretical results.
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