This paper studies the numerical deformation that time-domain integration (TDI) methods introduce to the shape of the coupling between the dynamic modes and variables of power system models. To this aim, we employ a small-signal stability analysis (SSSA)-based framework where such mode-shape deformation is efficiently identified by comparing the modal participation factors (PFs) of the power system model with the PFs of the discrete-time system that is derived from the application of the TDI method. The proposed approach is illustrated for TDI methods commonly used in dynamic power system calculations.

翻译：本文研究了时域积分（TDI）方法对电力系统模型中动态模态与变量之间耦合形态引入的数值变形。为此，我们采用基于小信号稳定性分析（SSSA）的框架，通过比较电力系统模型的模态参与因子（PFs）与应用TDI方法导出的离散时间系统的PFs，有效识别了此类模态振型变形。本文针对电力系统动态计算中常用的TDI方法演示了所提方法。