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

Protection and Control of Modern Power Systems

Table 10 Contingency ranking and analysis of the IEEE 30-bus system with pre-specified reactive power load

Prespecified reactive power load: Q12 = 148.9 MVAr, Q20 = 50.5MVAr, Q30 = 17.1 MVAr
Line outage	Rank of lines outages	Rank of each outage	Most stressed lines (from–to)	NCPI	L_mn	FVSI	LQP	NLSI	VSLI
29–27	1	1	30–27	0.9461	0.9005	0.8518	0.5430	0.8988	0.9001
		2	12–4	0.6731	0.6231	0.6129	0.5527	0.6129	0.4069
		3	28–27	0.5775	0.5433	0.5364	0.4953	0.5364	0.4602
12–4	2	1	12–13	0.8242	0.8242	0.8242	0.8242	0.8242	0.8242
12–4		2	6–10	0.6013	0.4775	0.4565	0.3118	0.4565	0.4825
30–29	3	1	30–27	0.8146	0.7742	0.7592	0.5326	0.7871	0.7878
		2	12–4	0.6694	0.6213	0.6115	0.5536	0.6115	0.4032
		3	28–27	0.5122	0.4805	0.4753	0.4384	0.4753	0.3922
20–19	4	1	20–10	0.6797	0.6421	0.6795	0.5645	0.5771	0.5901
20–19		2	12–4	0.6632	0.6067	0.5956	0.5282	0.5956	0.3948