某220 kV变电站直流偏磁引起的电流谐波分析

Harmonic analysis of 220 kV substation transformer caused by the DC magnetic bias

变压器直流偏磁一个显著的特点是造成变压器激磁电流严重畸变,产生大量谐波。该方面的研究目前主要停留在基于模拟试验和仿真研究上,少有基于现场数据进行的分析。论文以实际工程中广泛应用的Jiles-Atherton铁磁磁滞原理为基础建立变压器模型进行电力变压器直流偏磁的仿真研究,并结合金中直流投产过程中的直流偏磁测试结果进行比对分析。实测数据很好的验证了仿真结果,较好地反映了直流偏磁对变压器励磁电流谐波的影响。至此,通过仿真和实测获得了直流偏磁的谐波特点,为直流偏磁诊断和治理提供了重要依据。

A significant characteristic of the DC magnetic bias of Transformer is causing serious distortion of transformer magnetizing current,resulting in a large number of harmonic.There are a lot of research in this area,but mainly based on the experiment and simulation research,only a few analysis based on the field data.In this paper,the simulation research of a power transformer DC magnetic bias was done based on a transformer model which was established on base of the practical engineering widely used theorythe jiles-Atherton ferromagnetic hysteresis theory.And alloy compared and analyzed with Test results of DC magnetic bias in the process of Jin Zhong HVDC project.The simulation results are well verified by the measured data,which well reflects the influence of DC magnetic bias on the excitation current of the transformer.At this point,the harmonic characteristics of DC magnetic bias are obtained by simulation and measurement,which provides an important basis for DC magnetic bias diagnosis and treatment.