无源型直流转换开关在金属回线柔直电网中的应用分析  

Analysis and Application of Passive DC Transfer Switch in the Flexible DC Grid with Metallic Return Line

作　　者：王浩 王杰峰 任军辉 李璐 WANG Hao;WANG Jiefeng;REN Junhui;LI Lu(Xi’an XD Power System Co.,Ltd.,Xi’an 710065,China)

机构地区：[1]西安西电电力系统有限公司,西安710065

出　　处：《高压电器》2020年第8期243-249,255,共8页High Voltage Apparatus

摘　　要：直流转换开关是常规高压直流输电系统中重要设备之一,在采用金属回线的柔性直流电网中,无源型直流转换开关同样可以得到应用。由于柔性直流电网运行方式较常规端对端直流输电系统更为复杂,需要对直流转换开关的具体工况进行分析研究。文中对直流转换开关在金属回线柔性直流电网中的配置方案和运行工况进行了分析研究,通过建立转换/开断回路的数学模型,分析得出了直流转换开关关键工况的筛选依据;通过PSCAD/EMTDC仿真软件搭建仿真模型,验证了该筛选依据的正确性,为柔直电网用直流转换开关的设计提供依据。The passive DC switch can be applied to the flexible DC grid with metal return line.Since the flexible DC grid operation mode is more complicated than the classic end⁃to⁃end DC transmission system,it is necessary to ana⁃lyze the specific working conditions of the DC transfer switch.In this paper,the configuration scheme and operating conditions of the DC transfer switch in the flexible DC grid with metallic return line are analyzed.A mathematical model of the transfer/breaking loop is established to analyze and obtain the screening basis of the key operating condi⁃tions of the DC transfer switch.A simulation model is built with the PSCAD/EMTDC simulation software to verify the correctness of the screening basis.This study may provide a reference for design of the DC transfer switches for flexi⁃ble DC grid.

关 键 词：柔性直流电网 直流转换开关 运行工况 转换/开断回路 

分 类 号：TM721.1[电气工程—电力系统及自动化]