Fault-tolerant control for a modular generator and converter scheme for direct-drive wind turbines: Industrial Electronics, IEEE Transactions on

M.A. Parker, Chong Ng, Li Ran

Research output: Contribution to journalArticle

67 Citations (Scopus)
601 Downloads (Pure)

Abstract

A modular power electronic converter, with a cascaded H-bridge multilevel inverter, has been proposed as the grid interface for a large direct drive wind turbine generator. The present study is to investigate the potential and requirement of fault tolerant operation in such a system. As each module is connected to isolated generator coils, tolerance to a module or coil fault is possible if the affected module can be bypassed while the control of the healthy modules can be adjusted accordingly. A boost rectifier scheme on the machine side of the power conversion stage has been developed for this purpose, featuring control of the coil current without measuring the EMF. A coordinated DC-link voltage controller has been developed which can rapidly raise the DC-link voltage of the remaining modules to compensate for the loss of a module, while ignoring the ripple in the DC-link due to low-frequency inverter switching. The ability of the resultant system to tolerate module faults has been demonstrated on a small scale laboratory prototype.
Original languageEnglish
Pages (from-to)305-315
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Volume58
Issue number1
DOIs
Publication statusPublished - Jan 2011

Keywords

  • fault tolerance
  • invertors
  • power convertors
  • power electronics
  • power generation control
  • rectifiers
  • voltage control
  • wind turbines
  • boost rectifier scheme
  • cascaded H-bridge multilevel inverter
  • coil current
  • coordinated dc-link voltage controller
  • direct-drive wind turbine generator
  • electromotive force
  • fault-tolerant control
  • grid interface
  • isolated generator coils
  • low-frequency inverter switching
  • modular generator-converter scheme
  • modular power electronic converter
  • power conversion stage

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