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

作　　者：贾冠龙 于新超 苑宇辰 唐诵 李明硕 刘晓明 JIA Guanlong;YU Xinchao;YUAN Yuchen;TANG Song;LI Mingshuo;LIU Xiaoming(State Key Lab of Reliability and Intelligence of Electrical Equipment(Hebei University of Technology),Beichen District,Tianjin 300401,China;Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education(Northeast Electric Power University),Jilin 132012,Jilin Province,China;School of Electrical Engineering,Zhejiang University,Hangzhou 310058,Zhejiang Province,China)

机构地区：[1]省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学),天津市北辰区300401 [2]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(东北电力大学),吉林省吉林市132012 [3]浙江大学电气工程学院,浙江省杭州市310058

出　　处：《电网技术》2023年第12期5129-5137,共9页Power System Technology

基　　金：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);河北省自然科学基金青年基金(E2022202065)。

摘　　要：直流断路器是柔性直流输配电系统中不可或缺的部分,其能够快速地切除系统中的故障电流,保证电网安全稳定运行。针对高压直流断路器大容量开断时无法抑制故障电流,该文提出了一种具有预限流能力的柔性直流断路器拓扑,其具有预充电电容自充电和自适应重合闸能力。该拓扑主支路仅由超快速机械开关构成,故障处理支路包括换向电路、振荡电路、限流电路和分断电路。拓扑采用振荡电路实现故障电流换向,同时在故障电流分断前对其进行预限流。该文针对所提拓扑的结构和工作过程进行了详细的介绍,并对故障电流的转移和预限流过程做了理论分析推导。最后,在PSCAD/EMTDC搭建了单端等效系统,对理论分析结果进行仿真验证,并基于四端直流电网的仿真模型,将所提拓扑与ABB混合式直流断路器进行对比分析,分断时故障电流幅值减少了43.04%,仿真结果证明了所提拓扑的可行性和经济性。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 

分 类 号：TM721[电气工程—电力系统及自动化]