with x = [x1 x˙ 1]T and w = g is considered as a disturbance.
The objective of this paper is to design an anti-windup
adaptive PID control of the magnetic levitation system which
has the output y(t) regulates a set point r.
B. Error System with Internal Model Filter
In order to achieve the control objective, we first introduce
an internal model filter.
u(t) = GIM(s)[ua(t)] =
s +
s
[ua(t)] , (4)
where ua(t) is a designed control input.
Defining an output error by e(t) = y(t)−ym, the obtained
error system form the input ua(t) to the error e(t) can be
expressed by the following form:
˙e(t) = Aee(t) + beua(t) + b(t)
˙ (t) = −(t) + cT e(t)
e(t) = [1 0]e(t)
(5)