自耦变压器直流偏磁特性仿真与分析

Analysis and simulation on Autotransformer DC bias property

为分析电网自耦变压器遭受直流偏磁的影响,本文应用PSCAD电磁暂态仿真软件搭建了自耦变压器仿真模型,分析了直流偏磁对变压器励磁电流、无功功率损耗以及谐波等的影响程度。仿真结果表明了,随着直流偏磁电流的增加,励磁电流波形逐渐变为尖顶波且谐波含量较大,同时,无功功率损耗也与直流偏磁电流呈线性关系增加。本文的研究成果可为今后国家大型电力网络建设提供一定的参考依据。

In order to analyze the effect of power grid autotransformer suffering from dc bias. The paper sets up the simulation model of autotransformer using electromagnetic transient simulation software of PSCAD and analyzes the influence degree of transformer excitation current,reactive power loss and harmonic etc. suffered from dc bias. The simulation results show that the waveform of field current becomes the spire wave and the content of harmonic becomes more, following with the increase of dc bias current, at the same time, reactive power loss and dc bias current have a linear relationship. The research results of this paper provides certain reference basis for the construction of the future large state power network.