This paper presents a multiple time-step solver based on a time-domain explicit integration algorithm for improving the computational speed of high-voltage transmission line electromagnetic transient (EMT) simulation. For weakly rigid EMT models of high-voltage transmission lines, the previous precise Runge-Kutta integration method with a small time step is adopted; for strongly rigid nonlinear EMT models of high-voltage transmission lines, a an improved precise integration method using a large time step is used for the solver of EMT simulation. Practical simulations for overvoltages of high-voltage transmission line show that multiple time-step EMT solver can be applied to different cases of EMT simulation for transmission line.

中文翻译：

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高压输电线路快速过电压计算的时域显式积分算法

本文提出了一种基于时域显式积分算法的多时步求解器，以提高高压输电线路电磁暂态（EMT）仿真的计算速度。对于高压输电线路的弱刚性EMT模型，采用以前的精确的Runge-Kutta积分方法，且步长较小。对于高压输电线路的强刚性非线性EMT模型，EMT模拟的求解器采用了一种改进的，使用大时间步长的精确积分方法。高压输电线路过电压的实际仿真表明，多个时间步长的EMT求解器可以应用于输电线路EMT仿真的不同情况。