摘要
为研究变压器励磁电流在正负半波严重不对称和畸变引起的直流偏磁效应,利用MATLAB软件提供的Simulink仿真工具搭建了变压器直流偏磁的仿真模型,对施加不同直流电压激励时的励磁电流畸变情况进行了仿真分析,并通过对不同直流偏磁下得到的励磁电流波形进行快速傅里叶变换,得到了变压器在不同直流偏磁下的谐波分布情况,验证了变压器直流偏磁理论。仿真分析结果表明:当变压器有直流入侵时,励磁电流上半周波发生畸变;当变压器正常运行时,励磁电流中只含有奇次谐波,不含偶次谐波分量。
In order to study the DC magnetic bias caused by serious asymmetry of positive/negative half wave and distortion of transformer excitation current, this paper establishes the simulation model of DC magnetic bias by Simulink provided by Matlab, simulates and analyzes excitation, and makes rapid Fourier transform of the excitation current distortion under different DC voltage acquired excitation current wave form under different DC magnetic bias, by which the harmonic wave distribution is worked out and the transform DC magnetic bias theory is verified. The result of simulation shows that when DC intrudes, the upper half of cycle of excitation current distorts; when under normal operation ,there is only odd harmonic in excitation current, without even harmonic.
出处
《黑龙江电力》
CAS
2013年第5期388-390,共3页
Heilongjiang Electric Power
关键词
变压器
直流偏磁
仿真模型
励磁电流
谐波
transformer
DC magnetic bias
simulation model
excitation current
harmonic wave
