考虑集肤效应和邻近效应的变压器绕组谐波损耗计算及实验研究

基于国内外现有变压器谐波模型发展情况及其适用范围的局限性,以进一步精确量化变压器绕组谐波损耗为目的,建立了绕组谐波损耗模型。该模型综合考虑谐波情况下集肤效应、邻近效应对绕组的影响,基于电磁场原理分析绕组电阻参数畸变特性。进行了各次谐波电流下的绕组电阻测量实验,将实验测量值、传统模型计算值与该模型计算值进行对比,结果证明该模型提高了计算精度,使得变压器绕组损耗计算更加精确。最后基于实验测量值,建立了变压器绕组谐波电阻工程实用模型,对工程计算具有一定的指导价值。

Calculation and experimental study on harmonic loss of transformer windings considering skin effect and proximity effect

Based on the development of existing transformer harmonic models at home and abroad and the limitations of their applicable scopes, a model of harmonic loss for windings is established for the purpose of accurately quantifying harmonic losses of transformer windings. This model comprehensively considers the influence of the skin effect and the proximity effect on the windings under harmonic conditions and analyzes the distortion characteristics of the winding resistance parameters based on the principle of electromagnetic field. The experiment for measuring winding resistance under each harmonic current is performed. Comparing with the experimental measurement values, the traditional model calculation values and the calculated values of the model, it is proved that the model improves the calculation accuracy and makes loss calculation of the transformer winding more accurate. Finally, based on the experimental measurements values, an engineering practical model of harmonic resistance of transformer winding is established, which has certain guiding value for engineering calculation. This work is supported by Key Projects of National Key Research and Development Program of China (No. 2016YFB0101900).