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DOE OSTI · 1976030

Improved multiline HVDC circuit breakers with asymmetric conducting branches

Xiao, Huangqing·Huang, Xiaowei·Xu, Feng·Dai, Leisi·Zhang, Yongjun·Cai, Zexiang·Liu, Yilu
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Abstract

Here, this paper proposes two improved multiline HVDC circuit breakers (DCBs) for HVDC grid applications, including type-1 improved multiline DCB and type-2 improved multiline DCB. The two improved DCBs draw on the core idea of extended H-bridge. m adjacent DC transmission lines share a single main breaker (MB) and surge arrester. Due to the extended H-bridge design, bidirectional current flow can be achieved by a unidirectional MB. An upper conducting branch and a lower conducting branch are connected to a DC line. The upper and lower conducting branches in the two improved multiline DCBs are asymmetric. The upper conducting branch of both two improved DCBs is formed by a load commutation switch (LCS) and an ultra-fast disconnector (UFD). The lower conducting branch of the type-1 improved scheme is composed of a diode and a UFD; and of the type-2 improved scheme is made up of diode stack. Compared with other DCBs, the proposed type-1 DCB and type-2 DCB are more cost effective. Among the five DCBs, the type-2 improved scheme requires the least number of individual switching actions. The effectiveness and feasibility of the proposed schemes are verified through simulation of a bipolar three-terminal HVDC grid in PSCAD/EMTDC.

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42 ENGINEERINGDC fault isolationHVDC grideconomic efficiencyimproved multiline HVDC breakeroperation reliability

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Xiao, Huangqing, Huang, Xiaowei, Xu, Feng, Dai, Leisi, Zhang, Yongjun, Cai, Zexiang, Liu, Yilu. 2021-12-22. Improved multiline HVDC circuit breakers with asymmetric conducting branches. https://doi.org/10.1016/j.ijepes.2021.107882

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