Leveraging Modal Analysis for Multi-scenario Power System

In this paper the small-signal stability of the New England 39-Bus Test System, which was modeled by PowerFactory of DIgSILENT, is studied for which a review of the state of the art of modal analysis as tool to obtain the oscillatory modes of an electrical power system. For its study and relying on a Python script, the engine mode of PowerFactory is used to determine the graphic evolution of the trajectory of the electromechanical oscillation modes, paying special attention to the critical modes whose frequency is found between 0.1 to 2 Hz. To obtain the critical modes for various scenarios, a script was developed in DIgSILENT Programming Language (DPL) by PowerFactory is proposed, which considering the variation of the generation offer, for this new operating condition, the modes of the system are determined by means of the modal analysis tool available in PowerFactory. Finally, and in order to visualize the effect produced by the displacement of the critical oscillation modes, through a short circuit in a transmission line is sought observe the RMS simulation of generator variables that vary its potency.