Improved Harmony Search Algorithm to Compute the Underfrequency Load Shedding Parameters

Table 3

Optimal settings of the UF-relays by using the IHS algorithm.

UF-relay	Stage 1		Stage 2		Stage 3
	∆P (%)	fs (Hz)	∆P (%)	fs (Hz)	∆P (%)	fs (Hz)
Relay 1	48.94	59.31	30.42	59.03	20.56	58.79
Relay 2	2.76	59.30	32.61	58.88	26.60	58.51
Relay 3	7.54	59.34	16.44	58.94	3.56	58.48