Stability and voltage balance control of a modular converter with multiwinding high-frequency transformer

Zedong Zheng, Zhigang Gao, Chunyang Gu, Lie Xu, Kui Wang, Yongdong Li

Research output: Journal PublicationArticlepeer-review

33 Citations (Scopus)

Abstract

In this paper, a novel modular cascaded multi-level converter with multiwinding high-frequency (MWHF) transformer is proposed for medium-or high-voltage applications. In the proposed converter, a cascaded H-bridge rectifier (CHBR) is connected directly with the input ac source while the traditional step-down transformer is no longer necessary. Then, an isolated dc-dc converter composed by a group of H-bridge converters and a MWHF transformer with high power density is used to isolate the dc buses produced by the CHBR. The equivalent circuit and mathematical model of the MWHF transformer and the high frequency (HF) converter are obtained firstly in this paper. Then, the voltage stability under unbalanced loads is analyzed and the naturally balance ability is verified. To accelerate the dc bus voltage balancing process, a voltage balance control algorithm based on energy exchange between different transformer windings is proposed that is realized by accomplishing the phase shift adjustment of the terminal voltages on different windings. Simulations and experiments are implemented to verify the performance of the proposed converter and voltage balance algorithm.

Original languageEnglish
Article number6661423
Pages (from-to)4183-4194
Number of pages12
JournalIEEE Transactions on Power Electronics
Volume29
Issue number8
DOIs
Publication statusPublished - Aug 2014
Externally publishedYes

Keywords

  • H-bridge
  • high-frequency (HF) transformer
  • multilevel converter
  • voltage balance control

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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