电力建设2025，Vol.46Issue(10)：23-33,11.DOI:10.12204/j.issn.1000-7229.2025.10.003
耦合电感辅助限流型混合式直流断路器拓扑
Topology of a Hybrid DC Circuit Breaker with Coupled Inductor-assisted Current Limiting
摘要
Abstract
[Objective]With the increase in transmission capacity of DC grids,issues such as rapid rise of fault current,high amplitude,difficulty in breaking,and high cost arise in hybrid DC circuit breakers based on fully controlled power electronic devices.To address these issues,this paper proposes a hybrid DC circuit breaker topology with coupled inductors for current limiting.[Methods]In the proposed 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,thereby effectively reducing the fault current rise rate.The secondary side of the coupled inductors in the main branch pre-charges the self-charging capacitor;this remarkably reduces the equipment complexity.Traditional IGBTs and parallel capacitors are replaced by thyristors to switch surge arresters,improving the economy.[Results]The working principle and parameters of each main circuit in the proposed topology were analyzed.On this basis,a four-terminal DC transmission grid system model was established in PSCAD/EMTDC.The proposed topology was then compared with existing topologies via simulations.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 provides economic benefits.[Conclusions]The analysis shows that the proposed topology affords good breaking performance and certain economic benefits.These findings can provide a theoretical basis for the future application of high-voltage DC circuit breakers in DC transmission grid systems.关键词
直流电网/直流断路器/耦合电感/辅助限流/开断性能Key words
DC grid/DC circuit breaker/coupled inductors/auxiliary current limiting/break performance分类
信息技术与安全科学引用本文复制引用
章宝歌,李国栋,黄嘉宏,常巍山..耦合电感辅助限流型混合式直流断路器拓扑[J].电力建设,2025,46(10):23-33,11.基金项目
This work is supported by Natural Science Foundation of Gansu Province(No.23JRRA872). 甘肃省自然科学基金项目(23JRRA872) （No.23JRRA872）
