Skip to main content

Table 1 Relative stability and minimum damping ratio for xe = 0.4 Ω with P and Q in p.u

From: Design of a robust PID-PSS for an uncertain power system with simplified stability conditions

Q P = 0.2 P = 0.4 P = 0.6 P = 0.8 P = 1 P = 1.2
Relative Stability(σmax)
−0.4 −0.5991 − 0.9047 − 1.2777 −1.2703 − 1.2601 − 1.2488
−0.2 − 1.2424 − 1.2948 −1.3183 − 1.3247 −1.3232 − 1.3177
0 −1.4383 − 1.3757 −1.3809 − 1.3872 −1.3888 − 1.3867
0.2 −1.8060 − 1.5422 −1.4889 − 1.4746 −1.4688 − 1.4642
0.4 − 2.3851 − 1.7942 − 1.6495 −1.5958 − 1.5709 −1.5566
Minimum damping ratio (ζmin)
−0.4 0.3701 0.3517 0.3478 0.3461 0.3451 0.3438
−0.2 0.4627 0.3834 0.3610 0.3519 0.3473 0.3446
0 0.5465 0.4263 0.3843 0.3652 0.3550 0.3490
0.2 0.6119 0.4663 0.4100 0.3818 0.3659 0.3561
0.4 0.6643 0.4993 0.4338 0.3988 0.3780 0.3647