Calculation and analysis of surface magnetic induction intensity of substation grounding grid based on robust least squares

被引：0
|
作者：
Wang S. [1 ]
Wang F. [1 ]
Su L. [2 ]
Si W. [2 ]
Liu Y. [1 ]
机构：
[1] Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education, Shanghai Jiao Tong University, Shanghai
[2] Electric Power Research Institute, State Grid Shanghai Electric Power Company, Shanghai
来源：
Gaodianya Jishu | / 5卷 / 1600-1607期
基金：
中国国家自然科学基金;
关键词：
Grounding grid; Magnetic field inverse problem; Magnetic induction intensity; Robust least squares; Substation; Tikhonov regularization;
D O I：
10.13336/j.1003-6520.hve.20160412030
中图分类号：
学科分类号：
摘要：
In order to improve the accuracy of surface magnetic induction intensity calculation and reduce the site test workload, we proposed a method of magnetic field inverse problem based on robust least squares and Tikhonov regularization. First, a random form grounding grid model of a 35 kV substation was designed and customized based on dimensional similarity principle. Then, with the site test results of surface magnetic induction intensity containing gross error, the surface magnetic induction intensity of the grounding grid was calculated by the proposed method, and the calculation results were compared with the ideal value and the calculation results with no consideration of the gross error. The results show that using the calculation method proposed in the paper can obtain accurate surface magnetic induction intensity with less site test workload, and the method can resist gross error. The calculation result fits the ideal value and the average relative error is only 2.09%, which is superior to 61.6% when the gross error is out of consideration. Compared with that of the quasi-Newton BFGS method, the average relative error of axial current calculated by the calculation method proposed is only 2.22%, which is lower than that of the former method of 6.65%. The research may provide an important basis for the fault diagnosis and state evaluation of substation grounding grid. © 2016, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：1600 / 1607
页数：7
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