SELF-TUNING CONTROL SYSTEM ALGORITHMS IMPROVEMENT FOR PROVIDING EFFICIENCY OF ITS STARTING REGIMES
DOI:
https://doi.org/10.15588/1607-3274-2018-3-21Keywords:
ACS with self-tuning, gain, own motion component, start-up periodAbstract
Context. A whole series of technological type control objects have substantially nonlinear static characteristic, when gainthrough control channel changes in ten or more times. At the same time typical control systems with unchanged controller parameters
lose their stability and switch to the position mode of operation. Automatic control systems (ACS) with self-tuning of the controller
parameters allow to save a compromise between quality indicators and processes stability in the systems with such objects. Their
algorithms should provide effective system functioning not only in steady-state, but also in transient modes, when set point changes,
when control object is being transferred from the initial state, more often from idling, to the state of nominal load. The controlled
variable in the start-up modes must not violate the procedural limits of the technological process, since it can lead to emergency
situations.
Objective. To improve the ACS algorithms with self-tuning for the start-up conditions of the control object, ensuring the completion
of the self-tuning procedure during the start-up period and lowering the possibility of emergency situations.
Method. Utilizing analysis of the advantageous and disadvantageous factors for the self-tuning procedure, using heuristic
method, correction for the algorithms, which were developed earlier for steady-states, was proposed for the start-up period. Algorithms
correction efficiency is verified by simulation of the system in the Simulink environment of the MatLab software package.
Results. Computer experiments with models of alternative structures of the self-tuning system were planned and conducted. Obtained
figures and numerical values characterize the efficiency of its operation in the start-up modes.
Conclusions. To complete the self-tuning procedure during the start-up period and to prevent unacceptable dynamic control errors,
it is necessary to: a) increase the controller gain and decrease the persistence of the filters in the self-tuning loop during the startup
period; b) set the initial value of the control object model gain at the maximum possible level.
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