摘要
直流断路器是实现柔性直流电网直流侧故障隔离的重要设备,但现有拓扑中限流与换流单元的配合较少,导致设备集成度低、造价高、推广应用受限。为此,提出一种以电容作为限流及换流器件的多端口断路器拓扑,通过限流电容与换流电容的配合使断路器完成限流并加速换流过程;基于其在典型直流侧故障后的动态过程,提取了断路器所承受的电压电流应力、避雷器耗能特性,为断路器参数设计提供依据。基于PSCAD/EMTDC对设计的断路器进行电磁暂态仿真,通过断路器开断、重合闸等事件分析,表明了所设计拓扑结构的可行性,以及其内部配合的合理性。
The flexible DC grid is one of the effective solutions to solve the problem of large-scale new energy transmission and consumption,the DC circuit breaker is an important device for realizing the DC side fault isolation of the flexible DC grid,however,the current limit part of existing topology are less coordinated with the commutation part.Therefore,this paper proposes a multi-port circuit breaker topology with capacitors as current limiting and commutation parts.Through the cooperation of current limiting capacitor and commutation capacitor,the circuit breaker can complete current limiting and accelerate the commutation.In addition,the operation principle of the circuit breaker in the typical DC side fault is analyzed,the relationship between the voltage and current stress of the circuit breaker during operation,the energy consumption of the arrester and the parameters of system and circuit breaker is analyzed,and the design basis of circuit breaker parameters is given.Finally,the breaking and reclosing of the proposed circuit breaker are simulated and verified in PSCAD/EMTDC,and compared with the existing topology,which proves the feasibility of the proposed DC circuit breaker topology.
作者
陈凯
王威儒
童准
CHEN Kai;WANG Weiru;TONG Zhun(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education(Northeast Electric Power University),Jilin Jilin 132012;Guoneng Yongfu Power Generation Co.Ltd,Guilin Guangxi 541001)
出处
《东北电力大学学报》
2023年第6期32-41,共10页
Journal of Northeast Electric Power University
基金
国家自然科学基金(U2066208)。
关键词
直流断路器
直流输电网
多端口
限流
DC Circuit Breaker
HVDC transmission grid
Multi-port
Current limiting.
作者简介
第一作者:陈凯(1998-),男,在读硕士研究生,主要研究方向:柔性直流电网保护,935893021@qq.com;通讯作者:王威儒(1992-),男,博士,副教授,主要研究方向:柔性直流输电技术和数字物理混合仿真,wwr651224@163.com。
