Split Capacitor Ripple Reduction Method of 3-Level NPC Converter Using Zigzag Transformer

Geum Seop Song, Shenghui Cui, Jae Jung Jung

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

In the case of Neutral Point Clamped (NPC) converter, the 3rd harmonic component of the capacitor neutral point current causes voltage ripples to each DC link capacitor. The capacitor's low-order harmonic voltage ripples cause distortion in the converter output and reduce the stability of the system. Therefore, when the output of the converter increases, the ripple component of the capacitor also increases, so that a capacitor with a higher capacitance is required to ensure the reliability of the NPC converter. In this paper, a technique to reduce DC link capacitor voltage ripples by compensating the 3rd harmonic voltage of the DC link capacitor of a 3-level NPC converter with the output offset voltage using a zigzag transformer is proposed. The proposed technique was verified through both simulations.

Original languageEnglish
Title of host publicationICPE 2023-ECCE Asia - 11th International Conference on Power Electronics - ECCE Asia
Subtitle of host publicationGreen World with Power Electronics
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1906-1911
Number of pages6
ISBN (Electronic)9788957083505
DOIs
StatePublished - 2023
Event11th International Conference on Power Electronics - ECCE Asia, ICPE 2023-ECCE Asia - Jeju, Korea, Republic of
Duration: 22 May 202325 May 2023

Publication series

NameICPE 2023-ECCE Asia - 11th International Conference on Power Electronics - ECCE Asia: Green World with Power Electronics

Conference

Conference11th International Conference on Power Electronics - ECCE Asia, ICPE 2023-ECCE Asia
Country/TerritoryKorea, Republic of
CityJeju
Period22/05/2325/05/23

Keywords

  • 3-level NPC converter
  • DC distribution
  • DC link capacitor
  • zigzag transformer

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