不等长多导体传输线模型串扰问题分析

Analysis of crosstalk problem in multiconductor transmission lines model with unequal length

摘要:

不等长多导体模型为电力电子系统中传输线的一种常见结构，其串扰问题关系到整个系统的正常运行。采用时域有限差分格式对传输线方程进行差分离散，并结合基尔霍夫定律，对不同多导体系统连接位置进行处理，推导出多导体传输线上电压电流迭代公式，实现了整个模型上全部电压电流的同步求解，并通过算例验证了该方法在分析电大尺寸传输线电磁干扰问题时的有效性。

Abstract:

As a common structure of power electronic system, the unequal length multiconductor transmission lines model has a crosstalk problem which may affect the normal operation of the whole system. In this paper, the Finite Difference Time Domain(FDTD) format is employed to differentially discretize the transmission line equation, and the Kirchhoff’s law is utilized to process the connection positions of different multiconductor systems. Then, the iterative formulas of the voltage and current on the multiconductor transmission lines are derived, and the simultaneous solutions of all voltages and currents on the entire model are realized. Finally, the effectiveness of the method in analyzing the electromagnetic interference problem of electrically large transmission lines is verified by a numerical example.