基于时域有限差分法的电缆系统电磁瞬态分析

深入研究电缆系统的电磁瞬态过程对于合理解决高压电缆系统的过电压防护、绝缘配合和电磁干扰等工程问题具有极为重要的实际意义.传统的计算方法如电力系统电磁瞬态计算程序EMTP软件需同时考虑电缆分布参数和相模变换矩阵的频变特性,过程较为繁琐.基于时域有限差分算法,提出了一种新的电力电缆电磁瞬态分析的计算模型.该模型仅需在相域考虑电缆阻抗参数的频变特性,既保证了计算精度,又简化了计算过程.通过与其它电缆计算模型相比较,验证了算法的正确性.最后,将所提算法扩展应用于同轴电缆系统的瞬态分析,计算结果与实验结果相当吻合.

Electromagnetic Transient Analysis of Cable System Based on FDTD Method

Electromagnetic transient analysis of high-voltage cable system has significant practical meaning on the engineering problems,e.g.over-voltage protection,insulation coordination and electromagnetic interference.Frequency-dependent characteristics of both distributed parameters and phase-modal transformation matrices need to be taken into account for traditional method,e.g.EMTP software.Based on the finite difference time-domain(FDTD) method,a novel model is presented for transient analysis of power cable system.In this model,only frequency-dependent characteristic of cable's impedance parameters needs to be considered in phase domain.Compared with other models,the proposed model is demonstrated to be correct.As an extension,this model is improved for transient analysis of coaxial cable system.The calculated results are in good agreement with the experimental results.