Implementation of Static Line Voltage Stability Indices for Improved Static Voltage Stability Margin

Table 2

System performance of the IEEE 57-bus test system.

	Objective functions
	Case 1	Case 2	Case 3	Case 4
Pg (MW)	1,268.30	1,265.17	1,264.58	1,265.62
Qg (MVar)	237.70	195.08	196.73	205.57
Loss (MW)	16.63	14.17	13.28	13.55
Cost ($/h)	41,828.39	42,122.71	42,078.60	44,054.27
Maximum FVSI	0.3408	0.2809	0.2411	0.3467
Maximum Lmn	0.3436	0.2830	0.2425	0.3494
Maximum LVSI	0.8731	0.8558	0.8572	0.8072
Sum FVSI	4.4305	2.8404	2.8147	4.7031
Sum Lmn	4.5054	2.8698	2.8463	4.7656
Sum LVSI	13.8230	12.7749	12.8361	12.5250
Maximum loadability (MW)	2,395.84	2,441.80	2,416.11	2,444.43