Topology of a Hybrid DC Circuit Breaker with Coupled Inductor-assisted Current Limiting

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ZHANG Baoge, LI Guodong, HUANG Jiahong, CHANG Weishan

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Abstract

[Objective] With the increase in transmission capacity of DC grids, hybrid DC circuit breakers based on fully controlled power electronic devices generally have problems such as rapid rise of fault current, high amplitude, difficulty in breaking, and high cost. To address these issues, a hybrid DC circuit breaker topology with coupled inductors for current limiting is proposed. [Method] In this topology, the primary side of the coupled inductors in the main branch limits the fault current for the first time, and the current-limiting branch limits the fault current for the second time, effectively reducing the fault current rise rate. The secondary side of the coupled inductors in the main branch pre-charges the self-charging capacitor, reducing the complexity of the equipment. Thyristors are used instead of traditional IGBTs and parallel capacitors to switch the surge arresters, improving the economy. [Result] The working principle and parameters of each main circuit of the proposed topology were analyzed and designed. A four-terminal DC transmission grid system model was established in PSCAD/EMTDC, and the proposed topology was compared with existing typical topologies through simulation analysis. When a short-circuit fault occurs, the proposed topology further reduces the peak value of the fault current limit, shortens the breaking time, reduces the energy absorption of the surge arrester, and has certain economic benefits. [Conclusion] The analysis shows that the proposed topology has good breaking performance and certain economic benefits, which can provide a certain theoretical basis for the application of high-voltage DC circuit breakers in DC transmission grid systems in the future.

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ZHANG Baoge, LI Guodong, HUANG Jiahong, CHANG Weishan. Topology of a Hybrid DC Circuit Breaker with Coupled Inductor-assisted Current Limiting[J]. Electric Power Construction. 0

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