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

Protection and Control of Modern Power Systems

Table 3 Heavy reactive power at some load buses of the IEEE 30-bus test system

Bus no.	Reactive power (MVAr)	Most critical lines	Lines (from–to)	NCPI	L_mn	FVSI	LQP	NLSI	VSLI
Bus-26	31.5	26–25	26–25	1.0086	0.8633	1.0055	0.6814	0.7459	0.7835
Bus-30	34.15	30–27	30–27	1.0091	0.9726	1.0038	0.7384	0.9528	0.9593
			30–29	0.8119	0.7822	0.8025	0.6244	0.7394	0.7459
Bus-14	96.5	14–15	14–15	1.0018	0.7776	0.9943	0.4405	0.5328	0.5763
			14–12	0.8540	0.7786	0.8540	0.6915	0.6891	0.7185
Bus-24	114	24–22	24–22	1.0020	0.8666	0.9986	0.6932	0.7597	0.7943
			24–23	0.8101	0.7478	0.8097	0.6500	0.6697	0.6902
			24–25	0.7517	0.6815	0.7517	0.5646	0.5715	0.5962
Bus-9	291.5	9–11	9–11	0.9807	0.9807	0.9807	0.9807	0.9807	0.9807
			9–6	0.9786	0.9757	0.9719	0.9651	0.9719	0.9206
			9–10	0.5930	0.5892	0.5881	0.5832	0.5881	0.5930
Bus-28	364	28–8	28–8	0.9981	0.9350	0.9917	0.8962	0.8957	0.9108
			28–6	0.8575	0.8314	0.8569	0.7893	0.8072	0.8067
			28–27	0.3405	0.3004	0.2964	0.2523	0.2964	0.4313
Bus-3	410	3–1	3–1	0.9994	0.9964	0.9435	0.7943	0.9913	0.9967
			3–4	0.8595	0.7877	0.8508	0.7573	0.7008	0.7468