“…As shown in Figure 5, the power injected to the system by Source 1 changed from 80% to 90% of , , i.e., became 0.9 from an initial value of 0.8, at t = 10 s, while the supply provided to the system by source 2 changed from 60% to the 80% of , , i.e., became 0.8 from an initial value of 0.6, at t = 20 s. In a similar way, and taking into account the local constant power loads, changes occurred with the source currents around their nominal values I in,1 , I in,2 , by varying the coefficients a 1 and a 2 . As shown in Figure 5, the power injected to the system by Source 1 changed from 80% to 90% of I in,1 , i.e., a 1 became 0.9 from an initial value of 0.8, at t = 10 s, while the supply provided to the system by source 2 changed from 60% to the 80% of I in,2 , i.e., a 2 became 0.8 from an initial value of 0.6, at t = 20 s. The system parameters were taken from [34,35] and are provided in Table 1, while all of the controllers' gains are given in Table 2. The system parameters were taken from [34,35] and are provided in Table 1, while all of the controllers' gains are given in Table 2.…”