Small-Signal Stability Analysis of Synchronverter-Based AC Microgrid in Islanded Mode

Synchronverter control of the inverter is a promising technology that can be used for controlling grid forming converters in an islanded AC microgrid. Synchronverter provides virtual inertia by emulating the characteristics of synchronous generators with simple control structure and better voltage and frequency regulations. This paper presents a small signal model of the synchronverter based microgrid with resistive(R), inductive(R-L) and Constant Power load (CPL) operating in islanded mode. The developed small signal model is validated by comparing it with the simulated model in MATLAB Simulink software. Further the microgrid is simulated on the Real Time Digital Simulator (RTDS) and the impact of load and PV array insolation changes are observed. The eigen value analysis is done to show the stability of the microgrid for R, R-L and CPL.