基于电位补偿的变压器直流偏磁抑制装置  

A restrain device for the transformer DC magnetic bias based on electric potential compensation

作　　者：尹忠东[1] 王帅[1] 王书瑶[1] 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《电测与仪表》2017年第3期94-98,共5页Electrical Measurement & Instrumentation

摘　　要：高压直流输电(HVDC)的快速发展使发生直流偏磁的变压器越来越多,严重影响交流电网正常运行,因此有必要对直流偏磁进行抑制。常用抑制偏磁电流的方法有中性线串电阻法、电容隔直法、电流反向注入法以及电位补偿法等。比较了现有的抑制变压器直流偏磁的主要方法,提出了基于电位补偿的变压器直流偏磁抑制装置拓扑,而后利用PSCAD/EMTDC对拓扑进行仿真,并且制作了试验样机,在低压环境下进行了模拟试验。仿真结果和试验结果一致,且符合理论分析,验证了该方法及装置拓扑的有效性和可行性。The high development of HVDC makes a contribution to the transformer DC magnetic bias,which does harm to the normal operation of ac power grid system and the transformer itself seriously.Therefore,it is necessary to restrain the dc bias in the neutral line.The common methods used to restrain DC magnetic bias are connecting a resistor or a capacitor in the neutral line,or reverse current injection,electric potential compensation and so on.This paper proposed a suppression method based on DC electric potential compensation after comparing the traditional methods.In addition,and presented a novel topology of a device based on the method above.What is more,the topology was simulated with PSCAD/EMTDC,and we conduct experiments in the lab,whose results are in accordance with each other,which proves that the topology has a satisfying performance on restraining the neutral current.

关 键 词：变压器 直流偏磁 电位补偿 抑制装置 

分 类 号：TM933[电气工程—电力电子与电力传动]