Stability Analysis of Active Front End Rectifier in Low-Voltage AC Micro-grid

The recent advances in distributed generation and in power electronics interfaced loads have been challenging the stability of the traditional distribution grid. In this framework, micro-grids are seen as a promising paradigm to augment the overall intelligence of the electrical grid, allowing for better power quality and for an increased penetration of distributed generation. To address the stability of such systems, the impedance modeling constitutes a widely adopted solution, thanks to its ease of application. This paper overviews the derivation and verification of the impedance model for a solid-state transformer interfaced grid. Simulations show excellent agreement with the theoretical analysis.