Reducing Peak Current and Energy Dissipation in Hybrid HVDC CBs Using Disconnector Voltage Control

Mohammad H. Hedayati, Dragan Jovcic

Research output: Contribution to journalArticle

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Peak fault current and energy dissipation in high voltage direct current (HVDC) circuit breakers (CBs) are very important parameters that impact dc grid protection development. This paper analyses a hybrid DCCB (HCB) control
that reduces peak current and energy dissipation, by regulating the voltage across contacts of the ultra-fast disconnector (UFD). This is achieved by manipulating the number of inserted surge arresters while contacts of the UFD are moving apart. The controller is seamlessly integrated with the current controller of HCBs. Analytical model for current and energy calculation is presented, verified, and employed for parametric studies. PSCAD simulation with 320kV, 16kA test circuit confirms that the proposed voltage control reduces the peak current and energy dissipation by around 20-30%. A 900V, 500A HCB laboratory hardware is described and the experimental results are shown to
corroborate simulation conclusions.
Original languageEnglish
Pages (from-to)2030-2038
Number of pages8
JournalIEEE Transactions on Power Delivery
Issue number4
Early online date12 Mar 2018
Publication statusPublished - Aug 2018



  • Dc meshed grids
  • HVDC protection
  • HCB
  • Fault current limiting

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