Analysis of the toroidal HVDC grounding systems in horizontal multilayer soils

Zou, Jun; Liu, Y.Q.; Yuan, Jiansheng; He, Jinliang; Cao, Lin; Lee, J.; Chang, Sughun

doi:10.1109/tmag.2006.871456

Cited by 11 publications

(3 citation statements)

References 7 publications

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“…So, the influence of transverse differences in conductivity between different geological structures and between seawater and land should be considered. Therefore, when building a soil model, a combination of horizontal and vertical soil layers needs to be considered [16][17][18][19][20]. It is recommended to present a soil electrical structure model using a mixed layered soil model as a coastal DC grounding electrode and establish a soil electrical structure model of a coastal DC grounding electrode in the paper, as shown in Figure 1.…”

Section: Establishment Of Mixed Layered Soil Modelmentioning

confidence: 99%

Using a mixed layered soil model to optimize the layout of coastal direct current (DC) grounding electrodes

Liu

Deng

Han

et al. 2023

Applied Mathematics and Nonlinear Sciences

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In recent years, with the rapid development of the coastal economy and the large-scale development of marine resources, power demand has risen sharply. So it is urgent to promote the construction of UHVDC projects. Coastal saline areas often contain more chloride and other salts than other inland areas due to the high humidity, salinity and light intensity of the marine climatic and environmental conditions, which lead to the different electrical performance of grounding electrodes under different layouts. Therefore, one of the key issues to realizing the rapid development of UHVDC in coastal countries is how to choose the best layout of the coastal DC grounding electrode. It is intended to simulate the coastal environment and establish a mixed stratified soil model using CDEGS to verify the validity of the model through experiments in this paper. Based on the mixed soil model, the changes in grounding resistance, surface potentials and step voltage of grounding electrode sites under zigzag shape, two-row and circular shapes layouts are studied. The results show that when the zigzag shape layout is selected, the ground potential amplitude of the grounding electrode is reduced by 45.77% and 42.7%, the step voltage amplitude is decreased by 39.85% and 32.22%, and the grounding resistance is decreased by 28.45% and 27.68%, compared with the two-row and circular layout. In addition, its utilization rate of electrodes is better than the other two layout shapes.

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Section: Establishment Of Mixed Layered Soil Modelmentioning

confidence: 99%

Using a mixed layered soil model to optimize the layout of coastal direct current (DC) grounding electrodes

Liu

Deng

Han

et al. 2023

Applied Mathematics and Nonlinear Sciences

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“…There are many shapes of grounding electrode, such as horizontal electrode, cross electrode, and ring electrode [11]. Some works have been done to analyze the characteristic of some kinds of grounding electrode [12][13][14]. For example, Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Ref. [14] analyzes the performance of the circle high-voltage direct current (HVDC) grounding system buried in the horizontal multilayer soil. However, they only analyze the current dispersion effect of one or two kinds of grounding electrodes.…”

Section: Introductionmentioning

confidence: 99%

Grounding Current Dispersion of HVDC Grounding System Under Dynamic Seasonal Frozen Soil

Zou¹,

Yang²,

Gao³

et al. 2020

PIER C

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When a high voltage direct current (HVDC) system works at single line operation mode, a big current will flow into the earth through the grounding system directly. Then the large current can cause damage to surrounding equipment and the environment. Therefore, it is significant to study the current dispersion characteristics of HVDC grounding system. Firstly, a ±800 kV HVDC model operated at single line mode is built. The grounding current can be seen as the equivalent current source injecting to the grounding system. Secondly, the current dispersion characteristics of horizontal, cross and ring electrodes are investigated. It proves that the ring grounding electrode shows better current dispersion characteristic. And the double-ring grounding electrode whose ratio of inner and outer rings is controlled at 0.7 to 0.75 can get a better current dispersion characteristic. In addition, a dynamic seasonal frozen soil resistivity changing model is built to study the effects of season on the grounding electrodes. The frozen soil would not only increase the ESP, the resistance to ground, and step voltage, but also reduce the current density and electrical field. When the frozen soil is melting, the current dispersion characteristics are the best. The results provide meaningful reference for the design of the grounding system in extremely cold regions.

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DC Ground Electrode

Zeng

Zhang

2012

Methodology and Technology for Power System Grounding

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Analysis of the toroidal HVDC grounding systems in horizontal multilayer soils

Cited by 11 publications

References 7 publications

Using a mixed layered soil model to optimize the layout of coastal direct current (DC) grounding electrodes

Using a mixed layered soil model to optimize the layout of coastal direct current (DC) grounding electrodes

Grounding Current Dispersion of HVDC Grounding System Under Dynamic Seasonal Frozen Soil

DC Ground Electrode

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