Title :
Research on Potential Distributions of Soil Surface Caused by Ground Electrode of HVDC System in Heterogeneous Soil Structure
Author :
Liu, Qu ; Li, LiCheng ; Zheng, Jianchao ; Guan, Zhicheng
Author_Institution :
Tsinghua Univ., Beijing
Abstract :
The soil model represents a fundamental role concerning the design of the ground electrode. It is important to analyze the influence on transformers caused during HVDC mono-polar operation. The surface potential affects the distribution of DC currents flowing through the neutrals of transformers. Sea is larger in area and less in resistivity than land. By mean of deriving the Green´s function in horizontal-layer and vertical-layer soil structures, the formula of in complex soil layer for calculating potential is derived using the concept of image. Simulation results show the surface potential closed to sea will drop to zero influenced by sea. The lower potential of substation makes more DC current of power grid flow through transformer neutrals.
Keywords :
Green´s function methods; HVDC power convertors; earth electrodes; power grids; transformers; Green´s function; HVDC monopolar operation; HVDC system; complex soil layer; ground electrode; heterogeneous soil structure; power grid flow; soil surface; substation; transformer neutrals; Conductivity; Electrodes; Green´s function methods; HVDC transmission; Ocean temperature; Power generation; Sea surface; Soil; Substations; Transformers; Earthing; Electrode; Grounding; HVDC Systems;
Conference_Titel :
Power Engineering Society General Meeting, 2007. IEEE
Conference_Location :
Tampa, FL
Print_ISBN :
1-4244-1296-X
Electronic_ISBN :
1932-5517
DOI :
10.1109/PES.2007.385516
