International Standard Serial Number:

ISSN 1001-4551

Sponsor:

Zhejiang University;

Zhejiang Machinery and Electrical Group

Edited by:

Editorial of Journal of Mechanical & Electrical Engineering

Chief Editor:

ZHAO Qun

Vice Chief Editor:

TANG ren-zhong,

LUO Xiang-yang

Tel:

86-571-87041360,87239525

Fax:

86-571-87239571

Add:

No.9 Gaoguannong,Daxue Road,Hangzhou,China

P.C:

310009

E-mail:

meem_contribute@163.com

Suppression method of neutral point potential fluctuation for threelevel NPC inverter based on SHEPWM
Published:2018-09-20 author:ZHOU You, HU Yaowei, CHENG Jingling, CHEN Guozhu Browse: 2561 Check PDF documents
                 Suppression method of neutral point potential fluctuation for threelevel NPC inverter based on SHEPWM
                                               ZHOU You, HU Yaowei, CHENG Jingling, CHEN Guozhu
                                     (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)



Abstract: Aiming at the neutral point potential fluctuation of threelevel NPC inverter based on traditional selective harmonic elimination pulse width modulation (SHEPWM), the influence of the fundamental and 3order harmonic on the neutral point potential fluctuation was analyzed, the relationship between the neutral point potential and 3order harmonic content was established, an improved SHEPWM method based on the 3order harmonic quantitative control was presented, the solving equation of SHEPWM switching angle was reconstructed by introducing the controlling equation of 3order harmonic, and on the basis of this, the optimal 3order harmonic content was deduced for the purpose of maximally suppressing the neutral point potential fluctuation. The gridconnected 2 MW/3 kV inverter model was built on the Matlab / Simulink platform, and the voltage fluctuation suppression effect of the improved SHEPWM method was tested. The results indicate that the improved SHEPWM method based on the 3order harmonic optimal content control can effectively suppress the low frequency fluctuation of the neutral point potential, which is significant to improve the output performance and to reduce the DClink capacitance of threelevel NPC inverter.

Key words: selective harmonic elimination pulse width modulation (SHEPWM); neutral point potential fluctuation; threelevel NPC converter; 3order harmonic

  • Chinese Core Periodicals
  • Chinese Sci-tech Core Periodicals
  • SA, INSPEC Indexed
  • CSA: T Indexed
  • UPD:Indexed

Copyright 2010 Zhejiang Information Institute of Mechinery Industry All Rights Reserved

Technical Support:Hangzhou Bory science and technology

You are 1895221 visit this site