Methodology applied
There will be 4 main controls aims which applied on the multivariable control system. Firstly is
optimal control, for this control it formulated where it minimize the cost index and maximize the
performance index. Hence for ideal control is the control to get the ideal output but it is not
achievable which mainly cause by the disturbance.
Possible control is to deal with some problems that have high- speed reference tracking, low control
action, unmeasurable disturbance and high tolerance of modelling errors. It improving the
performance of possibility of the future values and encounter any evolution of disturbance by time.
Practical control is the controller above the theoretical control which based on the models and ideal
performances. In the other meaning, practical control runs in almost actual process behaviour but
the behaviour might change. Practical control should be robust against the changes in requirements,
disturbances and operating conditions. Thus practical controller can be shown as the consistence
operate process in automatic which without any continuously surveillance of the operator.
