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Modern power system is undergoing a paradigm shift from the synchronousgenerators-based system to the power electronics converters-dominated system.With the high penetration of converters, serious stability problems areprovoked, especially the wideband oscillations. Various studies have beenconducted in this respect, while most of them separate the ac-side stabilitywith the dc-side stability. However, for the stability analysis of the hybridAC/DC grid, it is necessary to consider the converter ac-side and dc-side,simultaneously. In this paper, the stability analysis of voltage sourceconverters (VSCs) considering both ac and dc dynamics is carried out. At first,the three-port AC/DC admittance model of VSCs is established, and thecorresponding measurement method from simulations is presented to validate itsaccuracy. Secondly, based on such three-port model, two stability analysismethods are presented: the one is based on the system open-loop model, wherethe stability can be judged via the Generalized Nyquist Criterion (GNC); theother one is based on the system closed-loop model, whose stability can bepredicted through the pole-zero calculation. At last, a test AC/DC system isbuilt in MATLAB/Simulink, by which the effectiveness of the three-portmodel-based stability analysis is validated.

Three-Port Impedance Model and Validation of VSCs for Stability Analysis