Synthesis of robust controller with an internal model for objects without self-alignment
DOI:
https://doi.org/10.15587/1729-4061.2017.108531Keywords:
synthesis of controller, internal model, Н∞-norm, integral object, quality indicatorsAbstract
We examined the synthesis of an automated control system, which ensures the required operation quality of objects without self-alignment. As a result of employing as an optimality criterion a minimum of the Н∞-norm of a transfer function of the closed system, we obtained structures of the controllers with an internal model for the objects without self-alignment of first and second order with a delay. It was found that such controllers had one adjustable parameter, which is a compromise between the quality and the robustness of the closed system. By changing this parameter, it is possible to receive different quantitative indicators of the system operation quality. We derived direct and unambiguous dependences of key quality indicators of the system on the parameter of Н∞-controller. Results of these dependences are entered into a database. Based on these data, we created a program that determines such settings of the controller, which provide the required quality of a control system.
Therefore, it is possible to ensure with a guarantee maintaining the assigned quality indicator, which is convenient for practice, or achieve the desired combination of several quality indicators that is executed over the entire range of system operation, thereby ensuring its robustness.
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