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为了在机电暂态仿真中准确模拟半波长交流线路的波传输动态特性,提出将交流线路的动态相量模型应用于半波长输电系统仿真.动态相量模型在机电暂态仿真中得以应用的关键是仿真精度和仿真步长问题.半波长线路区外故障时,可以直接应用半周波固定步长进行机电暂态仿真;而当模拟半波长线路区内故障时,若仍采用半周波固定步长,则需应用线性插值的近似方法计算注入电流源.为保证仿真精度,并兼顾仿真速度,提出采用变步长仿真方法用于半波长线路区内故障.以电磁暂态仿真结果为基准,点对网半波长交流输电系统算例表明,动态相量模型比传统的交流线路稳态模型具有更高的仿真精度,且变步长仿真方法优于线性插值近似法.“,”In order to accurately simulate the wave transmission characteristics of the half wavelength AC line in the electromechanical transient simulation,this paper presents the application of AC line dynamic phasor model to the half wavelength transmission system simulation.The key to the application of the dynamic phasor model in the electromechanical transient simulation is the simulation precision and the simulation step size.When simulating external fault,half cycle simulation time step can be directly applied.While simulating internal faults of the half wavelength AC line still with half cycle time step,the approximate linear interpolation method must be used.To take account of simulation precision and speed,variable time step method was proposed.Based on the results comparison of electromagnetic transient simulation and electomechanical transient simualtion,it shows that the dynamic phasor model is more accurate than the traditional AC line steady state model,and the variable time step method is superior to the approximate linear interpolation method with fixed large time step.