Elimination of Commutation Failures of LCC HVDC System with Controllable Capacitors

Ying Xue, Xiao-Ping Zhang, Conghuan Yang

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This paper presents a novel hybrid converter configuration for conventional Line-Commutated Converter (LCC) HVDC technology aiming to eliminate commutation failures under serious faults. Dynamic series insertion of capacitors during commutation is utilized to increase the effective commutation voltage. The operating principles are presented followed by detailed mathematical analysis for both zero impedance single-phase and three-phase faults in order to select the required capacitor size and its voltage level. The performance of the proposed method is validated by simulation results in Real Time Digital Simulator (RTDS) and the results show that the proposed converter configuration is able to eliminate commutation failures under both fault cases. Consequently partial power transferring capability during single-phase fault and fast fault recovery from three-phase fault can be achieved. Further simulation results show that the harmonic content of inverter AC voltage and current are not significantly increased and the voltage stress of the thyristor valve is comparable to that of the original benchmark system.
Original languageEnglish
Pages (from-to)3289 - 3299
JournalIEEE Transactions on Power Systems
Issue number4
Early online date26 Oct 2015
Publication statusPublished - Jul 2016


  • Commutation failures
  • HVDC transmission
  • controllable capacitor
  • series capacitor insertion


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  • Elimination of Commutation Failure by Hybrid HVDC System

    Zhang, X-P. & Xue, Y., 10 Nov 2016, IPC No. H02M7/757, H02M7/525, H02M7/515, H02M7/521, Patent No. WO2016/177991, Priority date 5 May 2015, Priority No. PCT/GB2016/051008

    Research output: Patent

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