Modelling of V-Hz and vector controlled ASDs in PSCAD/EMTDC for voltage sag studies

S. C. Vegunta, J. V. Milanovic, S. Z. Djokic

Research output: Contribution to journalArticlepeer-review


This paper deals with modelling and performance of adjustable speed drives (ASDs) subjected to voltage disturbances in electric supply. The aim of this study was to develop appropriate models of typical ASD and investigate their sensitivity to voltage disturbances under various practical modes of operation and control. Accordingly, scalar controlled open and closed loop volts–hertz (V–Hz) and vector controlled closed loop ASDs are modelled in PSCAD/EMTDC environment, and their performance in the presence of voltage disturbances is investigated under typical operating and loading conditions.

The drive sensitivity to three-phase, two-phase and single-phase voltage sags and short interruptions was assessed, and the findings are discussed in the paper. Depending on the type of drive control, type of voltage sag, applied load torque and adjusted speed, various sensitivity curves were established and analyzed.
Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalElectric Power Systems Research
Issue number1
Publication statusPublished - Jan 2010


  • Adjustable speed drives
  • V–Hz drive control
  • Vector drive control
  • Voltage sags
  • Short interruptions
  • Voltage tolerance curves


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