快速傅里叶反变换在接地网暂态分析中的准确性验证

Accuracy validation of Fast Fourier Transform Inverse in the transient analysis of grounding network

分析了接地网暂态分析中计算地表电位所使用的快速傅里叶反变换算法的准确性。针对场点和源点距离相对较大时,经典快速傅里叶反变换和CDEGS中使用的改进型快速傅里叶反变换精度不足的问题,提出了基于数值积分的高精度算法。通过计算无限大均匀土壤模型下点电流源产生的电位分布,验证了算法的准确性、有效性。

This paper analyzes the accuracy of Fast Fourier Transform Inverse adopted to calculate surface potential in the transient analysis of grounding network.Aiming at the lack of accuracy caused by the traditional Fast Fourier Transform Inverse and the modified Fast Fourier Transform Inverse adopted in CDEGS when the distance of field point and source point is relatively big,the paper proposes the algorithm with high accuracy based on numerical integration and inspects and verifies the accuracy and effectiveness of the algorithm by calculating the electric potential distribution produced by point current source in the infinite evenly soil model.