A Novel Dual-<i>LC</i> Resonant DC Circuit Breaker Employing Soft-Switching Technique for Enhanced Performance

Zhang, Bei; Zhang, Xiangyu; Wu, Sihang; Zhan, Liangtao; Qi, Lei

doi:10.1109/tie.2023.3323739

Cited by 1 publication

(1 citation statement)

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“…Zhang proposed a topology in which a repetitively switched auxiliary electronic switch in the main branch helps an oscillation in the passive LC path [32]. North China Electric Power University enhanced the topology in [32], employing the soft-switching technique [33]. These enhanced topologies with power electronic devices improve the cost and reliability of mechanical DCCBs.…”

Section: Introductionmentioning

confidence: 99%

A Novel Direct Current Circuit Breaker with a Gradually Increasing Counter-Current

Chen,

Liu,

Jin

et al. 2024

Electronics

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A reliable and cost-effective mechanical direct current circuit breaker (DCCB) is a promising solution for DC interruption. However, the typical mechanical DCCB has difficulty in interrupting a rated current, because the high oscillating current superimposed on the rated current generates a steep current slope at current zero-crossing (CZC) points, which makes it difficult for the vacuum interrupter to extinguish the arc. The objective of this paper is to present a novel DCCB topology with a gradually increasing counter-current. It utilizes a full-controlled converter, a semi-controlled full bridge, and an LC oscillation branch to generate a gradually increasing counter-current, which is superimposed on any fault current and generates a smooth current slope at CZC points. The proposed DCCB topology is modeled with PSCAD, and the current slope and the initial transient interruption voltage (ITIV) at CZC are analyzed and compared with the typical mechanical DCCB. The results indicate that the current slope at CZC decreases by 57–84% in full-range current interruptions, and the ITIV can be reduced by the same extent. Additionally, the performance of the proposed DCCB is evaluated in a four-terminal HVDC system. A cost and performance comparison is conducted among the main topologies. The obtained results show that the proposed DCCB is a reliable solution for the multi-terminal HVDC system.

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Section: Introductionmentioning

confidence: 99%