Improved multiline HVDC circuit breakers with asymmetric conducting branches

Journal Article · 21 December 2021 · International Journal of Electrical Power and Energy Systems

DOI: https://doi.org/10.1016/j.ijepes.2021.107882 · OSTI ID:1976030

Xiao, Huangqing ^[1]; Huang, Xiaowei ^[1]; Xu, Feng ^[2]; Dai, Leisi ^[3]; Zhang, Yongjun ^[1]; Cai, Zexiang ^[1]; Liu, Yilu ^[4]

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1. South China Univ. of Technology (SCUT), Guangzhou (China)
2. Z(P)EPC Electric Power Research Institute (China)
3. Guangzhou Power Supply Company Ltd. (China)
4. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1976030
• Journal Information: International Journal of Electrical Power and Energy Systems, Journal Name: International Journal of Electrical Power and Energy Systems Journal Issue: 1 Vol. 137; ISSN 0142-0615
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English