Investigation of droop characteristics and X/R ratio on small-signal stability of autonomous Microgrid

The small-signal or steady-state stability analysis of an autonomous Microgrid and the impact of various parameters are investigated in this paper. This subject has drawn a lot of attention as the penetration of distributed generation is rapidly growing. The control system for an autonomous Microgrid with distributed control is described and the small-signal modeling approach is discussed. The model is validated using time domain simulation. Droop characteristics for grids with dominant reactance and resistance lines are explained and compared. The effect of reverse droop characteristics on small-signal stability is studied. Furthermore, it is shown that how connecting lines with different X/R ratio can affect the stability of an autonomous Microgrid.