Analysis of Small-Signal Stability in Power Systems with Virtual Inertia of Grid-Forming Inverters

• DOI: 10.5370/kiee.2024.73.3.469
• Publication Date: 2024-03-18T06:00:25Z
• Authors: Jin-Oh Lee; Hyeong-Jun Yoo; So-Seul Jung
• Keywords: SIGNAL (programming language); Power grid

With the increasing penetration level of renewable energy sources, rotational inertia in power systems is gradually decreasing by replacing conventional synchronous generators (SGs) with inverter-based resources. The loss deteriorates system dynamics such as large frequency excursion after disturbance. To enhance stability, grid-forming (GFM) inverters have gained attention owing to their capability forming AC grid without connecting an extra voltage source. However, a high GFM may cause unexpected couplings SGs and grid-following (GFL) inverters, because control logic inverters. Thus, stability analysis composed SGs, GFM, GFL needed. In this study, we developed state-space model entire system, subsequently performed small-signal particularly focusing on virtual