Fig. 8
From: Engineering structural robustness in power grid networks susceptible to community desynchronization
Instability Frontiers of Modified Networks. For each line addition considered (connections highlighted in color on the left), the mean instability frontier of the unmodified network (center, dotted black line) was compared to that of the network with the new connection (right, solid red line). Some candidates afforded little to no improvement ((a), with added line in orange), while others robustified the network so that it was resilient to considerably more severe faults ((b), with added line in green)