变压器直流偏磁抑制设备的应用分析  

Evaluation of DC bias restraint equipment application

作　　者：张露[1] 阮羚[2] 潘卓洪[1] 鲁海亮[1] 文习山[1] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072 [2]湖北省电力公司电力科学研究院,湖北武汉430077

出　　处：《电力自动化设备》2013年第9期151-156,共6页Electric Power Automation Equipment

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB724500)~~

摘　　要：对一随机生成的虚拟电网的直流偏磁抑制措施进行理论分析和数值求解,对中性点串联电阻/电容法、电流注入法的工作原理、实施方式、性能效果作分析。对比3种方法的实现方式和技术参数,证明了电阻法的阻值对目标变电站中性点直流电流和电网中性点直流总量存在饱和效应;全补偿的电流注入法和电容法的抑制效果没有明显区别;实际情况下是电容法优于电流注入法和电阻法;3种方法均会导致交流电网局部直流偏磁危害加剧,但电网直流电流总量下降,总体上直流偏磁风险下降。为了更有效地开展直流偏磁治理工作,提出了现代大型交流电网大范围采用中性点串联电阻/电容抑制直流偏磁的实施原则。Based on the theoretical analysis and numerical computation of DC bias restraint measurement for a randomly generated virtual grid,the working principle,implementation and performance of three DC bias restraint methods,i.e, neutral-point series resistor/capacitor and current injection,are analyzed. Their implementation and technical parameters are compared,which shows that,the resistance of neutral-point series resistor method has saturation effect to the neutral-point DC of substation or grid;the performance of fully compensated current injection method is similar to that of neutral-point series capacitor method;in practice,the performance of neutral-point series capacitor method is superior to neutral-point series resistor method and current injection method;all of three method lead to possible higher local DC bias but lower total DC bias in AC grid. It is proposed to widely apply the neutral-point series resistor/capacitor method in the DC bias restraint of large-scale AC grid.

关 键 词：直流输电 变压器 直流偏磁 电流注入法 中性点串联电阻 电容 

分 类 号：TM721.1[电气工程—电力系统及自动化]