Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter

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Abstract

A four-level π-type converter is a Neutral Point Clamped (NPC) multilevel converter topology for low/medium voltage applications. As the inherent issue with this topology, the DC-link capacitor voltage balancing is challenging, especially when it operates as a single-end inverter/rectifier with unity power factor. This paper proposes a closed-loop DC-link voltage balancing algorithm of a π-type converter that is effective and simple to implement. In principle, this approach is based on Redundant Level Modulation (RLM). The RLM utilizes additional voltage levels in each switching window to gain extra controllability of the DC-link capacitor voltages without affecting the average output voltage. An algorithm based on mathematical and logical operations is developed to utilize RLM to achieve the closed-loop voltage balancing. The proposed control method is effective over the full modulation index ( $M=0\sim$ 1.15) and full power factor range $(cos\varphi=0\sim 1)$ . The algorithm is implemented in a test rig, and the experiment confirms its effectiveness.
Original languageEnglish
Title of host publicationIECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages6
Volume45
ISBN (Electronic)978-1-7281-4878-6
ISBN (Print)978-1-7281-4879-3
DOIs
Publication statusPublished - 9 Dec 2019
EventAnnual Conference of the IEEE Industrial Electronics Society -
Duration: 14 Oct 201917 Oct 2019
https://iecon2019.org/

Publication series

NameProceedings of the Industrial Electronics Society Annual Conference
PublisherIEEE
Volume45
ISSN (Print)1553-572X
ISSN (Electronic)2577-1647

Conference

ConferenceAnnual Conference of the IEEE Industrial Electronics Society
Abbreviated titleIECON
Period14/10/1917/10/19
Internet address

Keywords

  • multilevel converter
  • voltage balancing
  • level-shifted carrier
  • π-type

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    Wang, J., Yuan, X., Jin, B., & Laird, I. (2019). Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter. In IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society (Vol. 45). (Proceedings of the Industrial Electronics Society Annual Conference; Vol. 45). Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/IECON.2019.8927147