柔性直流交流连接区故障分析  

Fault analysis of flexible DC/AC connection area

作　　者：范雪峰 黄金海 宋延涛 韩伟 郭玉茹 吴东崛 彭松 FAN Xuefeng;HUANG Jinhai;SONG Yantao;HAN Wei;GUO Yuru;WU Dongjue;PENG Song(XJ Electric Co.,Ltd.,Xuchang 461000,China;State Grid Henan Electric Power Research Institute,Zhengzhou 450000,China;Zhuhai XJ Electric Co.,Ltd.,Zhuhai 519060,China)

机构地区：[1]许继电气股份有限公司,河南许昌461000 [2]国网河南省电力公司电力科学研究院,河南郑州450000 [3]珠海许继电气有限公司,广州珠海519060

出　　处：《电力系统保护与控制》2020年第11期151-159,共9页Power System Protection and Control

基　　金：国家电网有限公司总部科技项目资助(52170218000M):混合多端直流输电线路故障保护与自适应重合方法研究。

摘　　要：描述常规特高压直流输电工程现状,展望柔性直流输电前景,介绍基于VSC模块化多电平换流器(modular multi-levelconverter)技术直流输电的基本原理。根据渝鄂背靠背直流输电工程柔性直流一次拓扑结构,搭建实时数字仿真器(RTDS)仿真模型。结合仿真验证结果,分析交流连接线区充电软启电阻切除前、解锁软启电阻切除后故障时的故障暂态及稳态特性。通过对柔性直流阀侧故障特性及阀侧故障时阀控本体过压过流现象的研究,设计针对于柔性直流的保护配合策略。This paper describes the current situation of a conventional HVDC transmission project,looks forward to the future of flexible DC transmission,and introduces the basic principle of DC transmission based on VSC modular multilevel converter technology.A Real Time Digital Simulator(RTDS)simulation model is built according to the flexible DC primary topology of the Y-E back to back DC transmission project.Based on the simulation results,the fault transient state and steady state characteristics are analyzed before charging soft open resistor removal and after unlocking soft open resistor removal.Through the study of the fault characteristics of the flexible DC valve side and the overpressure overflow of valve body in case of valve side failure,a protection and cooperation strategy for flexible DC is designed.

关 键 词：柔性直流输电 交流连接线区 故障暂态稳态特性 保护策略 实时仿真器 

分 类 号：TM721.1[电气工程—电力系统及自动化]