МЕТОД СИНТЕЗУ ГІБРИДНИХ СИСТЕМ АВТОМАТИЧНОГО КЕРУВАННЯ ДЛЯ БАГАТОВИМІРНИХ ТЕХНОЛОГІЧНИХ ОБ’ЄКТІВ.

The paper aims to develop a new method for the design of hybrid multivariable automatic control systems. We determine a hybrid control system as a system that includes two different types of parallel operating controllers. The paper's aim is achieved by solving the following tasks. The first task is to develop a method for the design of hybrid control systems. Investigated systems include PI controllers and a linear-quadratic controller. The second task is to investigate the resulting control system. The investigation is based on direct quality indicators, robustness, and fragility analyses. The most significant result of the paper is the development of a method for the tuning of a linear-quadratic controller, which should work with the decentralized control system in parallel. BLT (Biggest Log Modulus) method is used for decentralized control system tuning. BLT is a well-known method of PI controller detuning. The idea of BLT is to ensure the robustness of multivariable control systems tuned by Ziegler Nichols's rules. The proposed method for the design of the control system is not complicated. The possibility of correcting the tunings of decentralized controllers remains. Design of the new hybrid automatic control system for the distillation plant made using the developed method. The analysis of the dynamic properties of the designed control system showed that the use of a parallel linear-quadratic controller provides a small percentage of overshoot in the control by the reference and high accuracy of stabilizing the values of controlled variables at the largest disturbances. At the same time, the robustness does not decrease and the control system remains fragile, i.e., it is possible to change the settings of the controllers without significant loss of robustness. [ABSTRACT FROM AUTHOR]