Grounding parameter acquisition method based on arbitrary layered soil Green function

Abstract

The invention discloses a grounding parameter acquisition method based on an arbitrary layered soil Green function. Aiming at the two limitations of global equal-interval sampling and PRONY methods adopted by most layered soil green function calculation in current base parameter calculation, the method comprises the following steps: 1, the complex exponential term of the PRONY method is twice of the number of soil layers, and the calculated amount is linearly increased along with the number of soil layers; 2, key features of an integral kernel function cannot be effectively sampled through global equal-interval sampling; in order to solve the problem that a complex stratified soil model cannot be solved completely due to the fact that the complex stratified soil model cannot be solved completely, the invention provides an arbitrary stratified soil Green function calculation method for performing segmented sampling according to extreme points of an integral kernel function and fitting data points of segmented sampling in combination with a least square method by analyzing distribution characteristics of the integral kernel function. Compared with a PRONY method under global sampling, the method provided by the invention can better approach an integral kernel function, and has the advantages of high calculation efficiency, good precision and the like.

Description

technical field [0001] The invention belongs to the field of power systems, and relates to a method for calculating the Green's function of arbitrary layered soil based on subsection sampling and the least square method, and further obtaining grounding parameters. Background technique [0002] Accurate calculation of grounding parameters ensures safe and stable operation of power equipment, and Green's function calculation of layered soil is the basis for calculation of grounding parameters. Too many soil layers will directly lead to an increase in the calculation amount and a decrease in accuracy in the grounding parameter analysis process. For some complex soil models, the calculation results may even diverge and cannot be calculated. [0003] At present, a lot of research has been carried out on the calculation of the Green's function of stratified soil at home and abroad. I.F.Gonos and Wesley Pacheco Calixto et al. proposed to analyze the Green’s function of layered soi...

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Problems solved by technology

[0004] The calculation method of the layered soil Green’s function involved in the above calculation of grounding parameters is mainly based on global equidistant sampling and PRONY method fitting, which usually has two limitations: 1. The complex term of the PRONY method is twice the number of soil layers , the amount of calculation always increases with the increase of the number of soil layers, which makes the calculation of the grounding parameters complex and the amount of calculation is large; 2. Global equidistant sampling cannot guarantee effective sampling to the key features of the integral kernel function, resulting in complex layered soil models The grounding parameters cannot be solved for

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