摘要
提出了一种基于铁芯拓扑结构的三相多芯柱电力变压器谐波建模的新方法,将三相变压器用一组电路和磁路方程来描述,选用激磁主磁通和磁动势作为联接电路方程和磁路方程的中间变量。将三相变压器的谐波建模问题归结为三相变压器激磁电流的分析和计算,详细阐述了三相三芯柱变压器和五芯柱变压器激磁电流的计算和分析方法。在该模型中用单值磁化曲线来描述变压器铁芯的饱和效应,而涡流、磁滞和杂散损耗用三个等值电阻来模拟的。作者还讨论了建立相坐标下三相变压器谐波模型的基本方法。
A new harmonic modeling method for three phase multi-legged transformer based on its core topology is developed in which the three phase transformer is described by a set of electrical and magnetic circuit equations and three primary fluxes and magnetomotive forces (MMF) are used as the mediate variables to relate the electric circuit equations with magnetic circuit equations. The harmonic modeling problem of three phase multi-legged transformer is resolved into the analysis and calculation of the magnetizing currents of three phase transformer and the method for the analyzing and calculating the magnetizing currents in three phase transformers with three limbs and five limbs respectively is expounded. In the proposed model the saturation effect of transformer core is represented by monodromic magnetization curve. The eddy current and hysteresis losses in the core and the stray losses of the transformer are simulated by three equivalent resistances. Finally, the elementary procedure for establishing the harmonic models of three phase transformer in phase coordinate system is discussed.
出处
《电网技术》
EI
CSCD
北大核心
2003年第4期15-21,30,共8页
Power System Technology
