Study of the Control System With the Smith Predictor and Autotuning Algorithm AT-2 for Thermal Control Objects With the Constant Speed Actuator

Viktor F Kuzishchin,Elena I Merzlikina,Hoang Van Va,P.A Strizhak,G.V Kuznetsov,A.O Zhdanova

doi:10.1051/matecconf/20179101018

Viktor F Kuzishchin, Elena I Merzlikina + Show 4 more

Open Access

https://doi.org/10.1051/matecconf/20179101018

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Abstract

The application of the Smith predictor in the control system with a constant speed actuator is considered. In order to make it possible to use the Smith predictor a PID-controller with autotuning is used, the autotuning provides the control object model using a self-oscillation mode. The control object has a second order transfer function with a transport delay. The performance of the system was analyzed on an experimental workbench with the industrial constant speed actuator and a physical model of the control object. Recommendations are given, how to correct the PID-law parameters in order to improve the system performance.

Highlights

The Smith predictor can be used in order to improve the performance of a control system with a control object with time delay [1, 2]
The performance of the control system was estimated by the transient processes when the setpoint was changed and when the step disturbance ΔMV influenced the control object
The following variants of the control system parameters were considered: The PID-law parameters calculated by the AT-2, no predictor; The PID-law parameters calculated by the AT-2, the Smith predictor included; The Smith predictor included, the calculated PID-law parameters were corrected using the correction coefficient k=2 (KP was doubled)

Summary

Introduction

The Smith predictor can be used in order to improve the performance of a control system with a control object with time delay [1, 2]. When the Smith predictor is used it is necessary to correct the controller parameters in order to use the possibility to improve the operation speed of the system, this possibility is provided by the delay elimination regarding to the controller signal. The control system with a constant speed actuator widely used in power engineering is considered, it is recommended to use so called AT-2 [3] which provides self-oscillation mode in order to determine the control object mathematical model by means of frequency methods and to calculate the PID-law parameters later

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Results

Conclusion