基于变步长精细积分法的电磁暂态仿真计算方法

Electromagnetic Transient Simulation Calculation Method Basedon Variable Step Size Precise Integration Method

随着大规模新能源的并网以及新型电力电子器件的应用,电力系统数字仿真的复杂性不断提高,电磁暂态特性也变得日趋复杂。电力电子系统在进行电磁暂态仿真时,会遇到很多不连续现象和状态突变现象。在计算时,变步长精细积分多步法可以通过对步长的调节,使每一段步长达到要求的计算精度。为克服在不连续情况下由状态变量突变引起的数值波动,进一步优化电磁瞬态模拟,拟利用基于Adams线性多步法的精细积分法,并通过误差估计实现对非均匀项的自适应逼近。在MATLAB/Simulink仿真平台利用理论分析法进行数值模拟,结果表明,所提算法可以有效地提高电磁暂态计算效率和计算精度。该方法弥补了实际应用中传统的临界阻尼调整算法“忽略”不连续问题这一漏洞。

With the large-scale integration of new energy sources and the application of new power electronic de-vices,the complexity of power system digital simulation continues to increase,and the electromagnetic transient characteristics have become increasingly complex.When conducting electromagnetic transient simulation in pow-er electronic systems,there are many discontinuous phenomena and state mutations.The variable step fine inte-gration multi-step method can achieve the required calculation accuracy by adjusting the step size during calcula-tion.To overcome numerical fluctuations caused by sudden changes in state variables in discontinuous situations and further optimize electromagnetic transient simulation,the precision integration method based on Adams lin-ear multi-step method is used,and adaptive approximation of non-uniform terms through error estimation is achieved.A study is conducted on the method of numerical simulation using theoretical analysis on the MAT-LAB/Simulink simulation platform.The results show that the proposed algorithm can effectively improve the ef-ficiency and accuracy of electromagnetic transient calculation.It can fill the gap in practical applications where the traditional critical damping adjustment(CDA)algorithm ignores the discontinuity problem.