Electric Power ›› 2014, Vol. 47 ›› Issue (2): 48-52.DOI: 10.11930/j.issn.1004-9649.2014.2.48.4

• Orginal Article • Previous Articles     Next Articles

Comparison of Different Modulation Methods for Modular Multilevel Converter

TU Xiao-gang1, LI Hai-feng2, LIU Chong-ru2, LUO Hai-yun1, CHENG Xiao-xuan1   

  1. 1. Xi’an XD Power Systems Co., LTD, Xi’an 710075, China;
    2. State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
  • Received:2013-12-12 Online:2014-02-28 Published:2015-12-18
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51277068) and the Program for New Century Excellent Talents in University (NCET-12-0846)

Abstract: A comparison is made in this paper of various modulation methods in terms of the output characteristics of the modular multilevel converter(MMC). The modulation methods can be divided into submodule unified method and carrier phase shifted method based on the necessity of sorting the capacitor voltages of submodules. For a given voltage level, the harmonic distribution and the total harmonic distortion(THD) of the MMC output are obviously affected by the modulation methods. With increasing of the voltage levels, the THD reduction is varied with different modulation methods.

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