Modeling Techniques and Stability Analysis Tools for Grid-Connected Converters

Large-scale integration of renewable generation interfaced to the network through power electronic converters has led drastic changes in system dynamics. In islanded microgrids or weak grids, different control concepts for synchronization have been proposed provide virtual inertia and improve their resilience against transient events, ensuring safe operation without heavy redundant design. The complexity these power-related algorithms interaction with inner loops causes problems frequency components above range traditional studies which calls on modeling techniques a wider bandwidth. This work aims an outline methods grid-connected converter dynamics from subsynchronous switching sideband relevant analyzing tools. major contributions this are: 1. Theoretical foundations derivation processes are discussed each within time domain, domain harmonic domain. 2. Similarities differences between highlighted recommendations given regarding grid situations. 3. A case study active front end is shown analysis results validated by simulation Hardware-in-the-Loop (HiL) test, illustrating effectiveness methods.