Abstract
In this research work, a new attempt is made to implement a Repetitive Control Strategy (RCS) in a Liquid Level System (LLS). First, the liquid level system is approximated into a First Order Plus Time Delay (FOPTD) model by step testing method. RCS is incorporated in the conventional level control loop of proportional (P) mode. Ziegler-Nichols Tuning Rule (ZNTR) based proportional controller parameter is considered in the loop. A periodic signal of sine wave in inflow to the level system is generated and real time runs of the LLS are carried out for the periodic input tracking with RCS based P mode control loop. The performance analysis of periodic input tracking is done. A similar run is carried out with the system having conventional P-mode structure in the control loop. A comparison in the performance analysis clearly indicates that the incorporation of RCS in the control loop in LLS provides a better tracking performance than the conventional P mode. The robustness of RCS incorporation in control loop is also justified with another tuning rule.
Highlights
The salient features of the Repetitive Control Strategy (RCS) are as follows [Rong-Fong et al, 2000]: (i) In order to reduce tracking error in every period of the control system, tracking error in the previous period have to be considered
A newly designed VMAT01 interface board consisting of a multifunction,high speed analog to digital converter (ADC) and digital to analog converter (DAC) is interfaced with the PC-AT Pentium 4.The VMAT01 is capable of running the real time control algorithms in simulink tool of MATLAB platform directly
Real time runs of the Level System (LLS) are carried out for sinusoidal periodic tracking in RCS based P mode control and the tracking responses are recorded in figure 5
Summary
The experimental setup of Liquid Level System is shown in figure and specifications are given in Table. The setup consists of process tank, collection tank, variable speed motor pump and RF capacitance level sensor. The RF capacitance level sensor is fixed in the process tank to measure the level. The variable speed motor pump is attached to the collection tank and speed of the pump can be controlled by thyristor power control (TPC) unit
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
