FULL RANK AND REDUCED ORDER STATE OBSERVER CONTROLLERS USING POLE PLACEMENT- A COMPARATIVE STUDY

Abstract

The basic objective of a control system designer is to provide stability to the controlled system (plant). An unstable plant fails to function properly and in some cases instability can cause a catastrophic failure. An unstable plant has some of its poles in the Right Half of s-plane. Plant stabilization can be obtained with controller in the feed forward or the feed back paths. In the class of feed back .controllers, output and state variable feed back are most generally employed. In this work, an attempt has been made to design feed back controllers employing state variable feed back. The complete set of states not being available estimated states, with full and reduced order observers, have been used for the purpose of stabilisation of plant characteristics. Simulation studies on the effects of estimated state feed back have been carried out with square wave reference inputs. Assembly language programs have also been written to simulate the observers with pp 8086.