A study of grounding parameters of grounding grid in soil with massive texture by using fast multipole boundary method

The fast multipole boundary element method was proposed to solve the problems of large grounding grid under soil with massive texture parameters calculation which can not be worked out by the traditional boundary element method, whose required memory space for the coefficient matrix is squared with unknowns and limited by the available memory resources of computers. Compared to the traditional boundary element method, the memory space is reduced greatly by means of a three-dimensional adaptive octree storage structure which replaces the traditional storage schema based on coefficient matrix, and the computational efficiency is increased largely. In this paper, a small soil with massive texture grounding model was calculated and the accuracy as well as the efficiency of this method was confirmed by the comparison with traditional boundary element method and CDEGS. The advantage of the fast multipole boundary element method in solving large soil with massive texture grounding problems was tested by an example, which provides a direction for the further study of more complex grounding problems under soil with massive texture. © 2014 Chin. Soc. for Elec. Eng.