带静止无功补偿器功能的直流融冰装置过电压保护及绝缘配合  

Overvoltage Protection and Insulation Coordination for DC De-icer with Static Var Compensator

作　　者：吴传奇[1] 傅闯 董曼玲[1] 万华[1] 何俊佳[1] 

机构地区：[1]华中科技大学电气与电子工程学院,武汉430074 [2]南方电网科学研究院,广州510623

出　　处：《高电压技术》2013年第5期1258-1264,共7页High Voltage Engineering

基　　金：国家自然科学基金(51177068);国家"十一五"科技支撑计划重点项目(2009BAA23B02-8)~~

摘　　要：带静止无功补偿器(SVC)功能的直流融冰装置已经广泛应用于融冰装置的设计制造中。这种直流融冰装置兼具SVC和直流融冰2种功能,造成其2种工作模式下的稳态运行特点和故障过电压来源及幅值存在差异,对装置的控制保护系统和绝缘设计提出了不同的要求。为此,以典型参数的12脉动带SVC功能的直流融冰装置为研究对象,通过仿真建模,分析了装置的稳态运行特点、典型故障过电压及其影响因素。分析结果表明,2种工作模式的公共避雷器配置参数应以融冰模式的运行电压为参考,其最苛故障过电压来自融冰线路断线故障。在这种避雷器配置方案下,换流变压器阀侧和晶闸管两端的绝缘裕度在SVC模式下比在融冰模式下分别高10%和40%,符合装置运行于SVC模式时间远大于融冰模式的运行策略。DC de-icer with static var compensator（SVC） has been widely used in design and manufacturing of ice-melting installation.This kind of device has both de-icing and SVC functions,which result in differences between the steady-state operation characteristic,the sources and amplitude of overvoltage of the two operating modes,so there are different demands on the control and protection system,and insulation design of the installation.Therefore,taking the typical parameters of DC de-icer with SVC as objects,we studied the steady-state operation characteristics,the typical overvoltage,and influential factors of the installation by modeling and simulation.The simulative results show that the configuration parameters of the public arrester of both operation modes should consider the operating voltage under melting ice mode,while the most serious fault overvoltage comes from transmission line disconnection.With this arrester configuration,for a DC de-icer with static var compensator,the insulation margins of the valves side of converter transformers and the thyristor in SVC mode are 10% and 40% higher than those in de-icing mode,agreeing with the operating strategy that the operation in SVC mode is much longer than that in de-icing mode.

关 键 词：直流融冰装置 静止无功补偿器 SVC 过电压 绝缘裕度 绝缘水平 避雷器配置 绝缘配合 

分 类 号：TM761.1[电气工程—电力系统及自动化] TM86