基于对偶性原理的三相多芯柱变压器暂态模型

提出了一种基于对偶性原理的三相多芯柱变压器暂态模型；通过分析三相多芯柱变压器磁路模型并应用对偶性原理，建立了考虑电路与磁路耦合的变压器暂态计算模型，采用Jiles-Atherton铁磁磁滞模型来描述铁心模块的饱和以及磁滞效应，而涡流和杂散损耗用一个等值电阻替代，零序磁通用一个线性电感以及反映其涡流损耗的电阻代替；该模型可以计算分析直流偏磁和空载合闸等情况下变压器励磁电流以及铁心磁通等电气参数；算例分析结果与实验结果的对比证明了该模型的准确性。

A Transient Model of Three Phase Multi-legged Transformer Based on Duality Theory

This paper proposes a transient model of three phase multi-legged transformer based on duality theory.By analyzing the magnetic circuit of three-phase multi-legged core-type transformer,duality derived transient calculate model which considering electric circuit coupled with magnetic circuit was built.In the analysis of the magnetization curve,the relationship between B and H differs from the ordinary B-H curve.In this paper it is defined on the basis of Jiles-Atherton ferromagnetic hysteresis theory; eddy current losses resulting from the flux paths through legs are represented by an equivalent resistance.Furthermore,zero sequence flux paths are presented by the linear inductance,eddy current losses resulting from zero sequence fluxes are represented by resistance.The model can evaluate the inrush current value and exciting current value in transient state.Moreover,this model can provide the power system with a more thorough transient analysis.The application of the proposed model to a test system shows its validity.