直流偏磁下变压器无功消耗增多对系统电压的影响分析  

Analysis of System Voltage Impact by Transformer Reactive Power Consumption Increased Under DC Bias

作　　者：林湘宁[1,2] 杨国稳 翁汉琍[1] 潘美[1] 谢志成[2] 郑涛[1] 

机构地区：[1]三峡大学电气与新能源学院,宜昌443002 [2]华中科技大学国家强电磁中心,武汉430074

出　　处：《高电压技术》2016年第1期272-278,共7页High Voltage Engineering

基　　金：三峡大学人才科研启动基金项目(KJ2014B043);三峡大学2015年硕士学位论文培优基金(2015py040)~~

摘　　要：为了研究变压器发生直流偏磁时系统电压降低的现象,基于PSCAD/EMTDC平台,建立了同步发电机-变压器直流偏磁仿真模型。模型从电力系统无功平衡的角度出发,针对不同大小的直流电流入侵时,在稳态和故障两种情况下,对变压器的无功消耗情况及系统中关键点的电压进行了仿真。结果表明,系统稳态电压随直流偏磁电流的增大而降低,极端工况下可达9%,而且随直流偏磁电流的增大,下降速度越来越快;故障电压会随直流偏磁电流的增大而下降幅度增大,极端工况下可达5%,而且随直流偏磁电流的增大下降速度增快。In order to analyze the phenomenon that the system voltage decreases under direct current（DC） bias, we es- tablished a generator-transformer simulation model with DC bias based on the PSCAD/EMTDC software . From the viewpoint of system reactive power balance, we simulated and analyzed the transformer reactive power consumption and system voltage under steady and fault conditions with different injected direct currents. The results indicate that the sys- tem voltage under steady and fault conditions will both decrease with the increasing of the injected direct current. The decrease ratios of system voltage may exceed 9% and 5% under some extreme conditions, respectively. In addition, the decrease in system voltage will accelerate the increase of the injected direct current.

关 键 词：直流偏磁 励磁电流 变压器无功消耗 无功平衡 电压支撑能力 稳态电压 故障电压 

分 类 号：TM712[电气工程—电力系统及自动化]