A novel collapse prediction index for voltage stability analysis and contingency ranking in power systems

Protection and Control of Modern Power Systems

Table 13 Contingency ranking and analysis of the IEEE 118-bus system with two generator outages and pre-specified reactive power load at nodes 11, 20, 30, 33, 51, 75 and 96

Pre-specified reactive power load: Q11 = 872 MVAr, Q20 = 115, Q30 = 700 MVAr, Q33 = 150MVAr, Q51 = 165 MVAr, Q75 = 550MVAr, and Q96 = 343 MVAr
Generator outages (N-2)	The rank of generator outages	Rank of lines	Most stressed lines (from–to)	NCPI	L_mn	FVSI	LQP	NLSI	VSLI
Gen. 8 Gen. 74	1	1	75–69	0.8599	0.8344	0.7755	0.6047	0.8607	0.8635
		2	75–70	0.7939	0.7620	0.7933	0.7257	0.7219	0.7296
		3	30–26	0.7534	0.6889	0.6375	0.5087	0.6947	0.6945
Gen. 76 Gen. 99	2	1	75–69	0.7290	0.6846	0.6278	0.4769	0.7359	0.7460
		2	75–77	0.7116	0.6847	0.7112	0.6522	0.6402	0.6409
		3	30–26	0.7014	0.6275	0.5805	0.4482	0.6396	0.6398
Gen. 15 Gen. 19	3	1	30–26	0.7208	0.6498	0.6010	0.4690	0.6596	0.6605
		2	75–69	0.6666	0.6392	0.5852	0.4411	0.6977	0.7094
		3	33–37	0.6240	0.6156	0.6179	0.5610	0.6113	0.6045
Gen. 54 Gen. 56	4	1	30–26	0.7016	0.6272	0.5801	0.4472	0.6394	0.6401
		2	75–69	0.6671	0.6401	0.5865	0.4432	0.6980	0.7091
		3	51–49	0.6148	0.6017	0.5825	0.4833	0.6306	0.6293