State Controller Design in Programmable Logic Controllers

Abstract

There are presented two state controllers design approaches for product temperature in the reactor vessel model control. First of all in the state-feedback version of the linear quadratic regulation (LQR) problem were assumed that if not all x states can be measured they are still available for control. Second state controller design refers to the selection of the state controller gain matrix, using the pole placement method. Designed state controllers were tested in Matlab environment. Finally, only LQR controller was tested in the programmable logic controller (PLC). From the system responses to the step input it can be concluded that after the settling time, the occurrence of the steady state error depends on the reactor vessel agitator state and the limit time of the controller output. The following observation was made based on such results: the simulation and experimental results seem to justify the design concept of a state controller in the PLC. Il. 9, bibl.4 (in English; summaries in English, Russian and Lithuanian).