The impact of source and fault impedance on post-fault response of z-source circuit breakers

Daniel J. Ryan, Behrooz Bahrani

Research output: Chapter in Book/Report/Conference proceedingConference PaperOtherpeer-review

2 Citations (Scopus)


The Z-Source circuit breaker is a type of DC power electronic circuit breaker, which is able to autonomously isolate faults. It uses a circuit of passive components to autonomously commutate the main conducting switch (a thyristor) off during a fault. In order for the ZCB to operate correctly, the thyristor must remain reverse-biased for a defined time period when a fault occurs, i.e., the minimum turn-off constraint must be met. External fault and source impedances modify the time period that the thyristor remains reverse biased, which in turn impacts the fault conditions for which operation is autonomous. In this paper, this effect is investigated analytically through simulation and through experimentation on a hardware prototype.

Original languageEnglish
Title of host publication2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages10
ISBN (Electronic)9789075815276
Publication statusPublished - 6 Nov 2017
EventEuropean Conference on Power Electronics and Applications 2017 - Warsaw, Poland
Duration: 11 Sep 201714 Sep 2017
Conference number: 19th


ConferenceEuropean Conference on Power Electronics and Applications 2017
Abbreviated titleEPE 2017 ECCE Europe


  • DC collector network
  • Faults
  • Protection device
  • Thyristor
  • Z-source converter

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