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Field-circuit coupling-based direct current magnetic bias calculation method for soil model adopting three-dimensional asymmetric structure

An asymmetric structure and soil model technology, applied in the field of earth soil electrical structure modeling and transformer bias current calculation, can solve the problems of bias current calculation results error, large difference, etc., to reduce calculation errors, reduce Model error and the effect of improving evaluation accuracy

Active Publication Date: 2018-08-10
CHINA THREE GORGES UNIV
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Problems solved by technology

Although this method corrects the soil model, the horizontal layered soil model adopted greatly simplifies the real electrical structure, and only considers the change of soil resistivity in the depth direction, which is different from the actual situation. The difference is large, so there is still a large error in the calculation result of the bias current

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  • Field-circuit coupling-based direct current magnetic bias calculation method for soil model adopting three-dimensional asymmetric structure
  • Field-circuit coupling-based direct current magnetic bias calculation method for soil model adopting three-dimensional asymmetric structure
  • Field-circuit coupling-based direct current magnetic bias calculation method for soil model adopting three-dimensional asymmetric structure

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Embodiment Construction

[0042] A DC bias calculation method based on field-circuit coupling under a three-dimensional asymmetric soil model. The size of the soil model is determined by the DC bias influence range that needs to be considered, and the model is discretized into small cubes with a side length of 2m; through the actual Measure point data to determine the block division of the model; map the inverted 3D resistivity to each block, and map the non-3D resistivity data after conversion; determine the coordinates of the injection point through the injection test data, apply excitation, and determine the boundary conditions , divide the grid, and calculate the surface potential; determine the observation path, compare it with the results of the injection test, and correct the soil model; obtain the wiring diagram of the power system around the ground electrode, coordinates and other parameters, and build a DC circuit model; input the potential of each node, and carry out DC bias calculation. Sta...

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Abstract

The invention discloses a field-circuit coupling-based direct current magnetic bias calculation method for a soil model adopting a three-dimensional asymmetric structure. The method comprises the steps of determining the size of the soil model through a direct current magnetic bias influence range needed to be considered, and discretizing the model into small cubes with side lengths of 2m; throughactual measurement point data, determining block division of the model; mapping inverted three-dimensional resistivity to blocks, and mapping non three-dimensional resistivity data after conversion;determining stream injection point coordinates through stream injection test data, applying stimulation, determining a boundary condition, dividing grids, and performing surface potential calculation;determining an observation path, performing comparison with a stream injection test result, and correcting the soil model; obtaining a peripheral power system wiring diagram of an earth electrode andparameters such as coordinates and the like, and building a direct current circuit model; and inputting node potentials to perform direct current magnetic bias calculation. Starting from an initial model, the direct current magnetic bias calculation precision is improved; the possibility of protection mal-operation or refusal operation is reduced after operation of a direct current project; and the stability of power system operation is improved.

Description

technical field [0001] The invention belongs to the fields of soil electrical structure modeling and transformer bias current calculation, and in particular relates to a DC bias calculation method based on field-circuit coupling under a three-dimensional asymmetric structure soil model, which is mainly used for DC bias calculation. Background technique [0002] High-voltage direct current transmission has the characteristics of large transmission capacity and high economy, and has developed rapidly under the background of unbalanced distribution of energy and load centers in my country. With the increase of transmission capacity and voltage level, the influence of DC grounding pole on the DC bias magnetic field of the surrounding power system becomes more and more prominent. Therefore, in the site selection and design stage of the DC grounding pole, it is necessary to evaluate the magnetic bias influence of the surrounding power system. The accuracy of the assessment is dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F17/12G06F2111/10Y02A90/30
Inventor 熊奇唐红涛黄浩
Owner CHINA THREE GORGES UNIV
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