摘要
直流电网是应对远距离大容量输电、新能源并网及消纳等问题的有效手段,然而低阻尼特性、故障发展速度快的特点使得故障隔离困难,提升直流电网故障清除能力具有重要意义。文中基于电网中直流断路器的配置要求,提出了一种基于换流站节点类型的直流断路器配置方法,介绍了不同故障情形时该配置方法中直流断路器的动作时序、重合闸策略,并分析了输电线路保护判据及与换流站协调配合的措施。在PSCAD/EMTDC中搭建三端混合仿真模型,对文中所提配置方法与传统的配置方法下的故障进行仿真对比分析,仿真结果表明,所提配置方法能够快速隔离高压直流电网中的故障,减少停电范围,提高供电可靠性,可作为实际系统的一种可行方案。
DC grid is an effective means to deal with the problems of long-distance and large-capacity transmission,new energy integration and absorption.However,its low damping characteristics and fast fault development make it difficult to isolate faults.It’s of great significance to improve the fault clearance capability of DC power grid.Firstly,based on the configuration requirement of direct current circuit breaker(DCB),a configuration strategy of DCB node types of converters is proposed in this paper.Then,the action sequences and reclosing strategy of DCB in this configuration strategy under different fault conditions are introduced.Meanwhile,the criterion of transmission line protection and the measures to coordinate with converter station are also introduced.Finally,a three-terminal hybrid simulation model is built in PSCAD/EMTDC to simulate and analyze the fault phenomena of the proposed configuration methods and the traditional configuration method.The simulations results show that the proposed configuration strategy can quickly isolate the faults in HVDC grid,reduce the blackout range and improve the reliability of power supply,which can be used as a feasible scheme for practical system.
作者
王渝红
凌楠
曾琦
刘程卓
石富童
刘进飞
Wang Yuhong;Ling Nan;Zeng Qi;Liu Chengzhuo;Shi Futong;Liu Jinfei(School of Electrical Engineering and Information Technology,Sichuan University,Chengdu,610065,China)
出处
《电测与仪表》
北大核心
2020年第18期133-140,共8页
Electrical Measurement & Instrumentation
基金
国家重点研发计划资助项目(2017YFB0902400)。
关键词
高压直流电网
直流断路器
超高速隔离开关
配置策略
high voltage direct current grid
direct current circuit breaker
ultra fast disconnector
configuration strategy
