Parallel computing of multi-contingency optimal power flow with transient stability constraints

Protection and Control of Modern Power Systems

Table 9 Speedup and efficiency of the parallel program under step 0.02 s

Number of Contingencies	NE39		IEEE300		C703
Number of Contingencies	Speed-up Ratio	Efficiency	Speed-up Ratio	Efficiency	Speed-up Ratio	Efficiency
2	0.73	0.37	1.21	0.61	1.30	0.65
4	1.20	0.30	2.00	0.50	2.16	0.54
6	1.60	0.27	2.60	0.43	2.90	0.48
8	2.03	0.25	3.18	0.40	3.62	0.45
10	2.25	0.23	4.05	0.40	4.45	0.45
12	2.58	0.22	5.17	0.43	4.81	0.40
14	2.84	0.20	4.67	0.33	5.40	0.39
16	3.22	0.20	5.14	0.32	5.84	0.36
18	3.32	0.18	5.43	0.30	5.90	0.33
20	3.54	0.18	6.36	0.32	6.42	0.32
22	3.62	0.16	5.94	0.27	6.93	0.31
24	4.12	0.17	7.04	0.29	7.27	0.30
26	4.05	0.16	7.36	0.28	7.36	0.28
28	4.49	0.16	7.57	0.27	7.26	0.26
30	4.83	0.16	7.11	0.24	7.27	0.24
32	4.85	0.15	7.27	0.23	7.28	0.23