TDCM (three-dimensional combined-layer soil model)-based transformer substation ESP (earth surface potential) calculation and address selection detection method

A technology of surface potential and detection methods, which is applied in calculation, electrical digital data processing, special data processing applications, etc., can solve problems such as unclear physical meaning, increased computational complexity, and slow convergence speed, so as to achieve reasonable physical meaning and guarantee Reasonable site selection and simple mathematical processing

Inactive Publication Date: 2015-01-28
STATE GRID CORP OF CHINA +1
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  • Abstract
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  • Claims
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Problems solved by technology

Due to the slow convergence speed of the classic mirror image method, it is not capable of deriving TDCM Green's function; because the complex mirror method introduces concepts such as complex distance and angle, which greatly increases the computational complexity, and the position and intensity of the mirror image are complex numbers, physics The meaning is ambiguous, so the application is quite limited
The above reasons limit the exact solution of any multi-layer TDCM Green's function, resulting in severe distortion of the evaluation of the DC flow passing through the neutral point of some transformers, resulting in unreasonable power grid planning schemes and DC bias control measures

Method used

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  • TDCM (three-dimensional combined-layer soil model)-based transformer substation ESP (earth surface potential) calculation and address selection detection method
  • TDCM (three-dimensional combined-layer soil model)-based transformer substation ESP (earth surface potential) calculation and address selection detection method
  • TDCM (three-dimensional combined-layer soil model)-based transformer substation ESP (earth surface potential) calculation and address selection detection method

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Embodiment

[0056] Taking the surface potential of major stations in a certain area in central China as the calculation object, analyze the ±500 After the DC unipolar operation of the high-voltage direct current transmission project, the 220 And the influence of above substation, utilize method of the present invention, according to the TDCM Green's function of derivation, utilize CDEGS emulation software to set up calculation program, form substation surface potential distribution map, image 3 It is a schematic diagram of a specific TDCM near a ground electrode, and it is used as a calculation example for analysis:

[0057] In the schematic, For point power, planar represents the ground plane. The axial direction is divided into three layers horizontally, and the soil resistivity and layer thickness of each layer are and ; then put The first layer of soil horizontally in the axial direction is in The axial direction is divided into three layers vertically, and the soil r...

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Abstract

The invention provides a TDCM (three-dimensional combined-layer soil model)-based transformer substation ESP (earth surface potential) calculation and address selection detection method. The method comprises the following steps of constructing a TDCM according to a soil structure of an area in the vicinity of a high-voltage direct current power transmission grounding electrode; constructing a Green function of a current point source according to the TDCM by utilizing a fitting mirroring method; deducing a potential expression according to the TDCM-based Green function, and calculating a transformer substation ESP distribution diagram by virtue of ESP calculation software; further calculating the magnitude of direct current flowing through a neutral point of a transformer; comparing a value of the direct current with a direct current bias threshold value of the transformer, and judging whether the transformer is threatened by direct current bias or not. According to the method, a theoretical basis is provided for accurately evaluating the magnitude of the direct current flowing through the neutral point of the transformer, the reasonability of transformer substation address selection in the vicinity of the direct current grounding electrode is ensured, support is provided for a control measure over a transformer substation with direct current bias, and the method is significant for the reasonable planning of an ultrahigh-voltage alternating current and direct current hybrid power grid and control over the direct current bias.

Description

technical field [0001] The invention relates to the technical field of substation surface potential calculation and detection, in particular to a TDCM model-based substation surface potential calculation and location detection method. Background technique [0002] In terms of long-distance, large-capacity power transmission and power system networking, high-voltage direct current transmission has obvious advantages, and plays an important role in the adjustment of my country's energy structure and the "West to East Power Transmission" project. However, when HVDC power transmission adopts a single-pole ground loop operation mode, the strong direct current into the ground causes uneven distribution of Earth Surface potential (ESP), and part of the DC current enters the AC transmission system through the neutral point of the grounded transformer, causing The DC bias of the transformer, the iron core is highly saturated, and the magnetizing current is severely distorted, resulti...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCY02E60/00
Inventor 李文峰白宏坤刘永民王江波李虎军杨萌
Owner STATE GRID CORP OF CHINA
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