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

Protection and Control of Modern Power Systems

Table 6 The line stability indices for the IEEE 118-bus system under heavy active power load

Bus No	Active power (MW)	Most Critical lines	Lines (from-to)	NCPI	L_mn	FVSI	LQP	NLSI	VSLI
Bus-13	500	13–15	13–15	1.0043	0.6722	0.2437	1.2909	0.2751	0.9904
			13–11	0.7460	0.2414	0.1401	0.4783	0.5245	0.8220
Bus-17	1014	17–30	17–30	0.9332	0.4395	0.3954	0.9032	0.3954	0.0979
			17–113	0.2336	0.2316	0.2295	0.2064	0.2459	0.2462
			17–16	0.1278	0.1134	0.1096	0.0863	0.1671	0.1651
			17–31	0.1162	0.0148	0.0131	0.0835	0.1904	0.2658
			17–15	0.0409	0.0269	0.0258	0.0368	0.0442	0.0540
			17–18	0.0408	0.0386	0.0381	0.0335	0.0601	0.0608
Bus-20	396.8	20–19	20–19	0.9721	0.5477	0.2854	0.7570	0.6897	0.9860
			20–21	0.5292	0.3222	0.2648	0.5240	0.0412	0.2246
Bus-51	466	51–49	51–49	0.9637	0.7095	0.2064	1.2640	0.3610	0.9981
			51–58	0.3480	0.1705	0.1361	0.0819	0.4109	0.5594
			51–52	0.1473	0.1234	0.1165	0.0779	0.2123	0.2301
Bus-67	695	67–66	67–66	0.9389	0.2999	0.1076	1.1730	0.2696	0.9281
			67–62	0.8464	0.3211	0.1762	0.5484	0.4856	0.8950