| A computer cluster with Ethernet, PC and software is set up. Numerical methods for electromagnetic field of grounding systems in frequency domain are researched. The methods presented in this thesis are verified by the results of experiments and other software. The main researches are as follows:(1) A set of software and hardware research platform has been set up based on computer clusters. The main code of the implement of parallel computing is given and a MPICH example is analyzed to show the performance of the platform.(2) With the purpose of making every process involved to have a balanceable task on the PC clusters, the whole impedance matrix is divided into blocks in the order of rows. Parallel algorithms of Gaussian elimination method is used to treat the linear quations based on MPI. In a serial of experiments, the parallel computing's performance is analyzed.(3)The unequalpotential method based on field-circuit coupling theory was applied in the calculation of grounding grids in frequency. The resistance and self-inductance of conductors as well as mutual inductance between conductors are taken into account. The results are compared with those of world commercial software CDEGS and the correctness of the method is verified.(4) In order to research the transient response of grounding system by parallel calculation, the calculation model of grounding grids is built. The distribution of the entire substation grounding grid of surface potential and the distribution of the step voltage and touch voltage are calculated and analyzed.? Meanwhile, the safety performance of the ground grids is analyzed in frequency domian. |
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