Table 2 Parameters of the controllers.

From: Optimizing wind turbine blade pitch control via input output differential model free adaptive control

Parameter

Description

IO-MFAC

Basic-MFAC

PI

\(\eta\)

Cost function step factor

0.200

0.800

None

\(\mu\)

PPD weight factor

0.001

1 \(\times\) 10\(^{-5}\)

None

\(\lambda\)

Cost function weight factor

2.000

40.000

None

\(\rho\)

PPD step factor

0.015

0.001

None

\(\alpha\)

Input Output step factor

8.000

None

None

\(\beta\)

Input step factor

1.000

None

None

\(\phi _c(1)\)

Initial PPD

10.000

10.000

None

u(1)

Initial input pitch angle

0.000

0.000

None

y(1)

Initial output generator speed

0.000

0.000

None

\(K_p\)

Scale factor

None

None

0.0081

\(K_i\)

Integral factor

None

None

0.110