Available Transfer Capability Calculation Constrained with Small-Signal Stability Based on Adaptive Gradient Sampling

Table 3

Efficiency comparison of the IEEE 118-bus system.

	Serial computing		Parallel computing for SQP-AGS
	SQP-GS method	SQP-AGS method	Two cores	Four cores	Eight cores
Total time (s)	173.48	66.29	39.88	25.15	16.36
Gradient sampling time (s)	170.40	63.32	36.90	20.24	13.37
QP solver time (s)	2.78	2.67	2.68	2.62	2.69
Others’ time (s)	0.30	0.30	0.30	0.29	0.30
Speedup ratio,	—	—	1.71	2.86	4.05
Efficiency,	—	—	0.86	0.72	0.51
Iteration	18	17	17	17	17