Analysis and assessment of microgrid stability using the Nu gap approach

In this paper, a robust control system analysis of an isolated microgrid is introduced. This analysis is based on the concept of multiloop stability margin, and the Nu gap approach. This approach helps the system´s designer to ensure system stability under varying load conditions assuming a conventional cascaded control structure that employs an outer voltage control loop and an inner current control loop. Analysis and nonlinear detailed time domain simulation results are included.