ALGORITHMIC DETERMINATION OF POLE-ZERO REPRESENTATIONS OF POWER TRANSFORMERS ’ TRANSFER FUNCTIONS FOR INTERPRETATION OF FRA DATA
ALGORITHMIC DETERMINATION OF POLE-ZERO REPRESENTATIONS OF POWER TRANSFORMERS ’ TRANSFER FUNCTIONS FOR INTERPRETATION OF FRA DATA
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用于解释 FRA 数据的电力变压器传递函数的零极点表示的算法确定
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. Velásquez
中科院分区：
文献类型：
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作者：
M. Heindl;S. Tenbohlen;A. Kraetge;M. Krüger;J. Velásquez
频率响应分析比较电力变压器的测量传递函数。频率响应曲线的偏离表示绕组的电气或机械损伤。由于评估是由专家进行的，因此不存在解释测量结果的客观指导方针。本文研究了用复有理函数模型逼近电力变压器实测频率响应的方法。一种拟合算法将测量曲线中包含的信息映射到复杂度较低的零极点模型上。其目的是开发一种使用基于测量数据创建的分析模型进行自动解释的算法。考虑了频响分析对近似模型精度的要求。提出了一种基于改进的矢量拟合法的复有理函数估计的改进算法。最后，用实际测量数据演示了该算法的应用。
Frequency Response Analysis compares measured transfer functions of power transformers. Deviations of frequency response curves indicate electrical or mechanical damages of windings. As assessments are done by experts, no objective guidelines for interpretation of measurement results exist. This paper deals with approximation of measured power transformer frequency responses using complex rational function models. A fitting algorithm maps the information contained in measured curves on a pole-zero model of reduced complexity. The aim is to develop an algorithm for automated interpretation using analytical models created on the basis of measurement data. Requirements of accuracy of the approximation models for purposes of Frequency Response Analysis are considered. An enhanced algorithm for complex rational function estimation based on the proven Vector Fitting method is presented. Finally, application of the algorithm with real measured data is demonstrated.