新型整流桥串并联切换直流融冰装置  

New DC ice-melting device with the function of series-parallel switching of rectifier bridge

作　　者：陈立群 李成博[1] 周启文[1] 王翀[1] CHEN Liqun;LI Chengbo;ZHOU Qiwen;WANG Chong(NR Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《电力工程技术》2022年第6期230-238,共9页Electric Power Engineering Technology

基　　金：国家重点研发计划资助(2018YFB0904700)。

摘　　要：我国南方地区冬季气温低湿度大,在远距离传输的高压输电线路上经常出现区域覆冰问题,覆冰严重时会造成杆塔倒塌等电力事故。文中研究的新型整流桥串并联切换直流融冰装置即用于解决输电线路覆冰问题,可避免造成大面积供电中断。文中基于常规十二脉动直流融冰装置,通过原理分析、参数设计和仿真验证,提出一种新型直流融冰拓扑,可以同时满足导线融冰的大电流和地线融冰的高电压需求。相较于常规十二脉动直流融冰装置,采用新型直流融冰拓扑可以选用一半容量的换流变压器和一半通态平均电流的晶闸管,显著降低设备投资成本;且在大电流输出模式下可以有效减小注入系统的谐波电流,从而减小接入点的系统电压畸变,改善直流融冰装置投入运行时的系统电压质量。The winter in southern China is very cold,along with high humidity.Regional ice coating problem often appears in the long distance high voltage transmission lines,which may lead to serious power accidents such as tower collapse.A new direct current(DC)ice-melting device with series-parallel switching of rectifier bridge is studied to avoid widespread power outages.Based on the conventional 12-pulse DC ice-melting device,a new DC ice-melting topology is proposed through principle analysis,parameter design and simulation verification,and it simultaneously meet the high current demand for wire melting and the high voltage demand for ground wire melting.Compared with the conventional 12-pulse DC ice-melting device,the new DC ice-melting topology is able to select half-capacity transformer and half-current thyristor,which significantly reduces the equipment costs.Meanwhile,the harmonic current injected into the system decreases effectively when operating in high current output mode,so as to reduce the voltage distortion of the connected system.The new DC ice-melting device with the function of series-parallel switching of rectifier bridge is able to reduce the equipment costs and improve the system voltage quality when the DC ice-melting device is put into operation.

关 键 词：线路覆冰 直流融冰装置 串并联切换 切换开关 平衡电抗器 成本优势 

分 类 号：TM755[电气工程—电力系统及自动化]