Solid-state fault isolation devices: Application to future power electronics-based distribution systems

O. Vodyakho, M. Steurer, D. Neumayr, C. S. Edrington, G. Karady, S. Bhattacharya

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


This study addresses the timely issues of modelling, and defining selection criteria for, a solid-state fault isolation device (FID) intended for use in power electronics-based distribution systems (PEDS). This work subsequently derives the FID parameters by mapping the characteristics of a conventional medium-voltage distribution system onto that of the PEDS envisioned under a new multi-university Engineering Research Centre. When conventional circuit breakers are used in distribution systems, they have a relatively long clearing time, causing the voltage to collapse for a significant time. A semiconductor circuit breaker, however, is expected to be able to switch fast enough to keep a voltage disturbance within acceptable limits. The main focus of this study is to address the operational issues of the interaction between the power electronic converters and the solid-state FID. The utilisation of rate of current decrease (di/dt) control during turn-off in conjunction with passive clamping devices to manage the overvoltage that results from very fast circuit breaker operation is introduced. In contrast to a simple conventional RC-snubber circuit, the proposed overvoltage management avoids high leakage current, which is the undesirable drawback of RC-snubber circuits. The presented prototype is experimentally verified with low and medium-voltage test circuits.

Original languageEnglish (US)
Pages (from-to)521-528
Number of pages8
JournalIET Electric Power Applications
Issue number6
StatePublished - Jul 2011

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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