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Separation of the energy absorption and overvoltage protection in solid-state breakers by the use of parallel varistors
KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.ORCID-id: 0000-0003-3515-3536
KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.
2014 (engelsk)Inngår i: IEEE transactions on power electronics, ISSN 0885-8993, E-ISSN 1941-0107, Vol. 29, nr 6, s. 2715-2722Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Hybrid and solid-state breakers offer new possibilities in the power grid by enabling faster switching, and by simplifying dc breaking. However, they consists of expensive power electronic components that are sensitive to overvoltage transients and require energy absorbing elements mounted in parallel. At turn-off, the rapidly decreasing current in the power electronic switch and the presence of an inherent stray inductance leads to hazardous overvoltage transients across the breaker. This paper investigates the possibility to split the overvoltage protection and energy absorption into two separate components. By optimizing the voltage ratio between two varistors, one can dimension a small electronics varistor for overvoltage protection and a large power electronics varistor for energy absorption. With this setup the power electronics varistor is allowed to be in a circuit with a large stray inductance and can thus be placed further away without causing an uncontrolled overvoltage. It is shown both in circuit simulations as well as in a small-scale experiment that if the voltage ratio between the two varistors is large enough, the inner varistor only has to absorb 1-2% of the system energy.

sted, utgiver, år, opplag, sider
2014. Vol. 29, nr 6, s. 2715-2722
Emneord [en]
DC breaker, metal oxide varistor (MOV), overvoltage protection, snubber circuit, solid-state circuit breaker
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Identifikatorer
URN: urn:nbn:se:kth:diva-142295DOI: 10.1109/TPEL.2013.2272857ISI: 000331554000012Scopus ID: 2-s2.0-84893916784OAI: oai:DiVA.org:kth-142295DiVA, id: diva2:703018
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QC 20140305

Tilgjengelig fra: 2014-03-05 Laget: 2014-02-28 Sist oppdatert: 2017-12-05bibliografisk kontrollert

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