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

Protection and Control of Modern Power Systems

Table 12 Contingency ranking and analysis of the IEEE 118-bus system with two lines 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
Lines outages (N-2)	The rank of lines outages	Rank of each outage	Most stressed lines (from–to)	NCPI	L_mn	FVSI	LQP	NLSI	VSLI
96–97 75–74	1	1	75–70	0.9377	0.8722	0.9311	0.8523	0.8077	0.8437
		2	75–69	0.9356	0.9230	0.8815	0.7099	0.9330	0.9271
		3	75–77	0.9079	0.8871	0.8966	0.7985	0.8808	0.8722
		4	96–80	0.7021	0.6973	0.6987	0.6673	0.6951	0.6842
		5	30–26	0.7007	0.6297	0.5840	0.4560	0.6419	0.6382
30–8 96–82	2	1	30–26	0.8981	0.8586	0.7896	0.6618	0.8435	0.8516
		2	96–80	0.7343	0.7286	0.7314	0.6991	0.7249	0.7146
		3	75–69	0.6635	0.6355	0.5812	0.4369	0.6950	0.7072
75–69 13–11	3	1	30–26	0.7011	0.6330	0.5882	0.4642	0.6451	0.6378
		2	75–77	0.6747	0.6334	0.5766	0.4340	0.6925	0.7085
		3	96–80	0.5691	0.5663	0.5657	0.5405	0.5669	0.5544