一次直流线路永久故障分析及对策  

Analysis and countermeasures of a permanent failure of DC line

作　　者：刘孝辉[1] 张靖[1] 卢东斌[1] 薛海平[1] 张庆武[1] LIU Xiaohui;ZHANG Jing;LU Dongbin;XUE Haiping;ZHANG Qingwu(NR Electric Co.,Ltd,Nanjing 211102)

机构地区：[1]南京南瑞继保电气有限公司,南京211102

出　　处：《电气技术》2021年第11期51-55,共5页Electrical Engineering

基　　金：国家重点研发计划项目(2016YFB0900602)。

摘　　要：本文以现场实际发生的直流线路永久故障为例,详细分析永久接地故障发生后直流控制保护处理过程,以及故障未能及时隔离的原因和故障电流的流通回路。为了能更及时地进行故障隔离,本文考虑中性母线开关的分流能力,提出移相重启和功率回降两种策略,并分析比较两种策略的优劣,可根据工程现场一次设备的配置情况选择不同的策略。最后通过实时数字仿真实验验证了所提策略的可行性和有效性。Taking the actual permanent fault of DC line as an example,this paper analyzes in detail the treatment process of DC control and protection after the permanent grounding fault,the reason why the fault is not isolated in time and the circulation circuit of fault current.In order to isolate the fault more timely,considering the shunt capacity of the neutral bus switch,this paper proposes two strategies:phase-shifting restart and power drop back,analyzes and compares the advantages and disadvantages of the two strategies.Different strategies can be selected according to the configuration of the primary equipment on the project site.Finally,the feasibility and effectiveness of the proposed strategies are verified by real time digital simulation(RTDS)experiments.

关 键 词：永久故障 极隔离 移相重启 功率回降 

分 类 号：TM721.1[电气工程—电力系统及自动化]