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1.新能源电力系统国家重点实验室(华北电力大学),北京市 102206
2.新能源与储能运行控制国家重点实验室(中国电力科学研究院),北京市 100192
Received:01 August 2021,
Revised:2022-06-08,
Published Online:16 January 2023,
Published:25 February 2023
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贾科,施志明,张旸等.基于电缆早期故障区段定位的柔性直流配电系统保护方法[J].电力系统自动化,2023,47(4):163-171.
JIA Ke,SHI Zhiming,ZHANG Yang,et al.Protection Method for Flexible DC Distribution System Based on Cable Incipient Fault Section Location[J].Automation of Electric Power Systems,2023,47(4):163-171.
贾科,施志明,张旸等.基于电缆早期故障区段定位的柔性直流配电系统保护方法[J].电力系统自动化,2023,47(4):163-171. DOI: 10.7500/AEPS20210801003.
JIA Ke,SHI Zhiming,ZHANG Yang,et al.Protection Method for Flexible DC Distribution System Based on Cable Incipient Fault Section Location[J].Automation of Electric Power Systems,2023,47(4):163-171. DOI: 10.7500/AEPS20210801003.
在柔性直流配电系统中,直流极间短路故障使得全网换流器迅速闭锁,快于直流断路器动作时间,导致系统停运,极大降低了系统的可靠性。为此,文中针对直流电缆早期短路故障,提出一种基于早期故障区段定位的线路保护方法。通过本地换流器的主动注入,从而削弱线路阻抗对注入信号的衰减,显化早期故障特征,实现对早期短路故障的准确识别与区段定位,解决短路故障引发系统失电的问题。为避免频繁注入,提出基于差动电流量测的注入启动判据。PSCAD/EMTDC仿真结果表明该方法能够准确识别与定位早期故障区段,并及时隔离故障支路,且对系统运行影响小,具有一定的抗噪能力,可为柔性直流配电系统持续安全运行提供保障。
In the flexible DC distribution system
the DC pole-to-pole short-circuit fault makes the converters of the whole network quickly locked
which is faster than the action time of the DC circuit breaker
leading to the system outage and greatly reducing the reliability of the system. Therefore
this paper proposes a line protection method based on incipient fault section location for DC cable incipient short-circuit faults. Through the active injection of the local converter
the attenuation of the line impedance to the injected signal is weakened; the characteristics of incipient faults are displayed; the accurate identification and section location of incipient short-circuit faults are realized; and the problem of system power loss caused by short-circuit faults is solved. To avoid frequent injection
an injection starting criterion based on differential current measurement is proposed. The simulation results with PSCAD/EMTDC show that this method can accurately identify and locate the incipient fault section and promptly isolate the fault branch
and has a small impact on the system operation. It has a certain anti-noise ability
and guarantees the continuous and safe operation of the flexible DC distribution system.
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