变压器直流偏磁对无功补偿电容器的影响  

Impact of Transformer DC Bias on Reactive Compensation Capacitor

作　　者：鲁海亮[1] 文习山[1] 蓝磊[1] 李晓萍[1] 杨汾艳[2] 徐伯榆[2] 李金保[1] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]广东电网公司电力科学研究院,广州510600

出　　处：《高电压技术》2010年第5期1124-1130,共7页High Voltage Engineering

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

摘　　要：针对变压器发生直流偏磁时无功补偿电容器电流谐波过大的现象,基于Jiles-Atherton模型,在MAT-LAB平台下,建立了变压器直流偏磁仿真模型,仿真结果与实测数据符合很好。计算了不同直流偏磁电流条件下的电容器谐波电流,结果表明各次谐波随直流电流增加而近似呈线性增加,各电容器组之间发生4次谐波放大现象,容易造成电容器电流总有效值过大。通过增大串联电抗值来增加串联电抗率,可以避免4次谐波放大,增强无功补偿电容器组的直流偏磁承受能力。To research the phenomenon that transformer DC bias enlarges the current harmonic in reactive compensation capacitor,based on the Jiles-Atherton model,a simulation model for transformer DC bias was established in MATLAB,and the simulation results were well in agreement with the measured data.The capacitor current harmonics with different DC current were calculated.The results show that the harmonic is linearly increased with the DC current,the 4th order harmonic is amplified between the capacitor banks,which would cause the current in capacitors bank to exceed the security limit.Increasing the series reactor ratio through increasing the series reactor could avoid the 4th order harmonic amplification,and enhance the DC bias endurance ability of reactive compensation capacitors bank.

关 键 词：变压器 直流偏磁 无功补偿电容器 串联电抗器 磁滞 谐波 

分 类 号：TM531.4[电气工程—电器]