Study of black-box models and participation factors for the Positive-Mode Damping stability criterion

The dominance of power electronics in modern power systems makes it difficult to study stability with sufficient accuracy given the available information, so it is necessary to enhance current frequency-based stability methods. The positive-mode damping (PMD) criterion is a recently powerful proposed frequency domain method to study the stability of multi-infeed VSCs grid-connected networks in the nodal admittance matrix form. The integration of black-box models and the introduction of participation factors have been identified as key lines of this work for stability studies completeness. For this purpose, a case study is built in Matlab/Simulink to address the oscillatory phenomena of modern power systems modelled in the nodal admittance matrix form with the integration of black-box models. Furthermore, this study successfully tests the performance of the participation factors applied to the PMD, which have proven to be as useful as the ones of the state-space representation in a 7-bus network example.