Frequency support capability of variable speed wind turbine based on electromagnetic coupler

Rui You, Braulio Barahona Garzón, Jianyun Chai, Nicolaos Antonio Cutululis

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Abstract

In the variable speed wind turbine based on electromagnetic coupler (WT-EMC), a synchronous generator is directly coupled with grid. So like conventional power plants WT-EMC is able to support grid frequency inherently. But due to the reduced inertia of synchronous generator, its frequency support capability has to be enhanced. In this paper, the frequency support capability of WT-EMC is studied at three typical wind conditions and with two control strategies-droop control and inertial control to enhance its frequency support capability. The synchronous generator speed, more stable than the grid frequency which is the input signal for Type 3 and Type 4 wind turbine frequency support controller, is used for the calculation of WT-EMC supplementary torque command. The integrated simulation environment based on the aeroelastic code HAWC2 and software Matlab/Simulink is used to build a 2 MW WT-EMC model and study the frequency support capability of a wind farm consisting of WT-EMC. (C) 2014 Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalRenewable Energy
Volume74
Pages (from-to)681-688
Number of pages8
ISSN0960-1481
DOIs
Publication statusPublished - 2015

Keywords

  • ENERGY
  • RIDE-THROUGH CAPABILITY
  • POWER-SYSTEMS
  • FIXED-SPEED
  • NETWORK
  • Variable speed wind turbine
  • Synchronous generator
  • Electromagnetic coupler
  • Frequency support
  • Droop control
  • Inertial control

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