变压器发生直流偏磁时的谐波分析和治理

介绍了一种计算变压器直流偏磁时绕组励磁电流的数学模型，对励磁电流进行傅立叶变换后。计算得到各次谐波分量。对单相交流变压器绕组流过不同直流电流时变压器绕组的励磁电流各次谐波分量的含量和变化规律进行仿真研究，并探讨优化选择500kV变压器低压侧无功补偿电容器组参数配置的原则．有效吸收变压器产生的谐波，防止无功补偿设备发生谐波放大而损坏电容器设备。

Harmonic analysis and tackling of transformer under DC magnetic biasing

A mathematic model used to calculate the harmonic components of the excitation current of transformer windings under DC magnetic biasing is introduced in this paper.Harmonic components are calculated after Fourier transformation of the excitation current.Based on the program developed by the model,the harmonic components of the excitation current of single-phase AC transformer windings passed by different DC currents are simulated and studied.At the same time,in order to effectively absorb such harmonic currents and avoid damages to capacitors caused by harmonic amplification of reactive power compensating equipment,the parameter optimization for reactive power compensation capacitor banks on the low voltage side of 500 kV transformers is approached.