Direct-Quadrature Sequence Models for Energy-Function Based Transient Stability Analysis of Unbalanced Inverter-Based Microgrids

The reliability of supply in distribution networks can be improved by islanding (parts of) the network as autonomous microgrids case a contingency. Microgrids are commonly fed inverter-based distributed energy resources, which causes transient stability challenges due to lack inertia and strongly coupled dynamics. is conventionally analyzed time-domain analysis. However, energy-function based analysis has advantages over analysis, it provides result for all initial conditions allows uncertainty taken into account with domain attraction. generally unbalanced, however models unbalanced lacking literature. In this paper, sequence components resources load devices dq reference frame proposed, experimentally validated voltage transients. used an study microgrid. Finally, impact connection on analyzed. results indicate that proposed accurately represent behavior physical significantly impacts microgrids.