A Continuous Nonlinear Fractional-Order PI Controller for Primary Frequency Control Application

Table 1

Phase margin for different values of α.

α	Pm (open loop)	Pm (closed loop)
1.6	−17.9050	−26.5188
1.5	−4.9190	2.7335
1.4	7.7496	28.6387
1.2	31.6473	70.9987
1.1	42.6631	89.1184
1	52.9718	106.6472
0.9	62.5618	125.5485
0.8	71.4610	Inf
0.6	87.4403	Inf