基于PSCAD的海上特高压柔性直流线路保护的故障处理方法  

Protection of Offshore UHV Flexible DC Lines Based on PSCAD

作　　者：雷翔胜 王兴华 余梦泽 杨帆 刘寒轩 LEI Xiangsheng;WANG Xinghua;YU Mengze;YANG Fan;LIU Hanxuan(Research Center of Grid Planning,Guangdong Power Grid Corporation,Guangzhou 510080,China;NR Engineering Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]广东电网有限责任公司电网规划研究中心,广州510080 [2]南京南瑞继保工程技术有限公司,南京211102

出　　处：《计算机测量与控制》2023年第11期74-80,共7页Computer Measurement &Control

基　　金：国家自然科学基金项目(52061635102);南方电网公司科技项目资助(037700KK52220018)。

摘　　要：柔性直流输电技术迅速发展,但其所面对的问题也越来越多,一个典型的问题是直流输电线路出现故障时,其迅速变化的故障电流会对其可靠性产生影响,因此,如何在最短的时间内切断故障电流,保证电网的安全运行,研究符合要求的快速、可靠的柔性直流输电(FDC,flexible direct current)故障处理方法显得尤为重要;本文首先对FDC系统保护机理的研究现状进行了综述分析,对故障特点进行了探讨,针对直流输电线路的新原理、新的布线方式进行了创新,提出了一种既能满足各种需求又能保证其正常运行的高效的直流线路故障处理方法;仿真试验得出:在灵敏度系数K_(sen)=8.7的时候,不受过渡电阻的干扰,能够迅速地识别和隔离故障,判定时间最大为0.84 ms,判定准确率为100%,在工程应用中保证FDC系统的安全作用显著。Flexible DC transmission technology is developing rapidly,but it faces more and more problems.A typical problem is that when a DC transmission line fails,rapidly changing fault current has an impact on its reliability.Therefore,how to cut off the fault current in the shortest time and ensure the safe operation of the power grid,it is particularly important to study the fast and reliable flexible direct current(FDC)fault processing method that meets the requirements.In this paper,the research status of the protection mechanism is summarized and analyzed in the FDC system,and the characteristics of the faults are discussed.The new principle and new wiring method of the DC transmission line are innovated.An efficient DC line fault processing method that can meet various needs and ensure its normal operation is proposed.The simulation results show that when the sensitivity coefficient K_(sen)is 8.7,it is not disturbed by the transition resistance,which can quickly identify and isolate the fault.The maximum determination time is 0.84 ms,and the determination accuracy is 100%.The safety of the FDC system is significant in engineering applications.

关 键 词：柔性直流电网 线路保护 故障分析 故障识别 保护方案 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]