A medium-voltage matrix converter topology for wind power conversion with medium frequency transformers

Chunyang Gu, Harish S. Krishnamoorthy, Prasad N. Enjeti, Zedong Zheng, Yongdong Li

Research output: Journal PublicationArticlepeer-review

9 Citations (Scopus)

Abstract

A new type of topology with medium-frequency-transformer (MFT) isolation for medium voltage wind power generation systems is proposed in this paper. This type of converter is a high density power conversion system, with high performance features suitable for next generation wind power systems in either on-shore or off-shore applications. The proposed topology employs single-phase cascaded multi-level AC-AC converters on the grid side and three phase matrix converters on the generator side, which are interfaced by medium frequency transformers. This avoids DC-Link electrolytic capacitors and/or resonant L-C components in the power flow path thereby improving the power density and system reliability. Several configurations are given to fit different applications. The modulation and control strategy has been detailed. As two important part of the whole system, a novel single phase AC-AC converter topology with its reliable six-step switching technique and a novel symmetrical 11-segment modulation strategy for two stage matrix converter (TSMC) is proposed at the special situation of medium frequency chopping. The validity of the proposed concept has been verified by simulation results and experiment waveforms from a scaled down laboratory prototype.

Original languageEnglish
Pages (from-to)1166-1177
Number of pages12
JournalJournal of Power Electronics
Volume14
Issue number6
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • Matrix converters
  • Medium Frequency Transformer (MFT)
  • Medium Voltage (MV)
  • Multi-level converter
  • Wind power conversion

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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