电网技术2023，Vol.47Issue(12)：5129-5137,9.DOI:10.13335/j.1000-3673.pst.2022.1964
一种具有预限流能力的柔性直流断路器
Flexible DC Circuit Breaker With Pre-limiting Current Capability
摘要
Abstract
The DC circuit breaker(DCCB)is an indispensable part of a flexible DC transmission and distribution system,the function of which is to quickly remove the fault current in the system and ensure the safe and stable operation of the grid.In response to the inability of the high-voltage DCCB to suppress the fault currents when large capacities break,a flexible DC circuit breaker topology with pre-limiting current capability is proposed in this paper,which has the capability of pre-charged capacitor self-charging and adaptive reclosing.The main branch of this topology consists of the ultra-fast mechanical switches only,and the fault handling branch includes the commutation circuit,the oscillation circuit,the current limiting circuit and the breaking circuit.This topology achieves the fault current commutation by using an oscillation circuit,and pre-limits the fault current before breaking it.The structure and operation process of the proposed topology are introduced in detail,and the theoretical analysis and derivation of the fault current transfer and pre-limiting process are presented.Finally,a single-ended equivalent system is built in the PSCAD/EMTDC to simulate and verify the results of the theoretical analysis.Compared with the simulation model of a four-terminal DC power grid of the ABB hybrid DC circuit breaker,the fault current amplitude of the proposed topology is reduced by 43.04％,which proves the feasibility and economy of the proposed topology.关键词
直流输配电/柔性直流断路器/预限流/自适应重合闸Key words
DC transmission and distribution/flexible DC circuit breaker/pre-limiting current/adaptive reclosing分类
信息技术与安全科学引用本文复制引用
贾冠龙,于新超,苑宇辰,唐诵,李明硕,刘晓明..一种具有预限流能力的柔性直流断路器[J].电网技术,2023,47(12):5129-5137,9.基金项目
现代电力系统仿真控制与绿色电能新技术教育部重点实验室开放课题(MPSS2022-08) （MPSS2022-08）
河北省自然科学基金青年基金(E2022202065).Project Supported by the Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology,Ministry of Education （E2022202065）
Natural Science Foundation of Hebei Province of China Under Grant(E2022202065). （E2022202065）
