Indirect Frequency Optimality Indicators for Automatic Tuning of Controllers: Consideration of the Dependence on the Process Model Parameters

Authors

  • Виктор [Viktor] Федорович [F.] Кузищин [Kuzishchin]
  • Елена [Elena] Игоревна [I.] Мерзликина [Merzlikina]
  • Ван [Van] Ва [Va] Хоанг [Hoang]

DOI:

https://doi.org/10.24160/1993-6982-2019-6-106-114

Keywords:

automatic closed-loop control system, PID controller, PI controller, frequency responses, automatic tuning, indirect optimality indicators, approximation, process model

Abstract

The problem of tuning automatic closed-loop control systems equipped with PI and PID controllers with applying indirect optimality conditions based on the general properties of the frequency responses of typical control systems around the resonance frequency is considered. The above mentioned conditions boil down to the requirement according to which the complex frequency responses of the systems around the resonance frequency must have certain specified values of the parameters, called indirect frequency optimality indicators. The advantages of these optimality conditions are that they implement a systems approach to the tuning of controllers proceeding from the requirements for the system as a whole; in addition, they are convenient for adjustment subject to specific requirements for the system stability margin and the kind of quality indicator. The article presents calculation and approximation formulae for calculating the optimal values of indicators as functions of the parameters of the second-order process model with a time delay, which are obtained from accomplishing the first step of the automatic controller tuning algorithm. The calculation formulae are obtained proceeding from the primary optimality conditions that imply minimizing the integral control quality indicator subject to a constraint imposed on the frequency oscillatory indicator. Examples of calculating the tuning of PI and PID controllers using the indirect frequency indicators are given.

Author Biographies

Виктор [Viktor] Федорович [F.] Кузищин [Kuzishchin]

Ph.D. (Techn.), Assistant Professor of Automated Control Systems for Thermal Processes Dept., NRU MPEI, e-mail: KuzishchinV@yandex.ru

Елена [Elena] Игоревна [I.] Мерзликина [Merzlikina]

Ph.D. (Techn.), Assistant Professor of Automated Control Systems for Thermal Processes Dept., NRU MPEI, e-mail: MerzlikinaYI@mpei.ru

Ван [Van] Ва [Va] Хоанг [Hoang]

Ph.D. (Techn.), Engineer EVN Information Technology, Vietnam, e-mail: Hoangvatdh@gmail.com

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Для цитирования: Кузищин В.Ф., Мерзликина Е.И., Хоанг Ван Ва. Косвенные частотные показатели оптимальности для автоматической настройки регуляторов: учет зависимости от параметров модели объекта // Вестник МЭИ. 2019. № 6. С. 106—114. DOI: 10.24160/1993-6982-2019-6-106-114.
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For citation: Kuzishchin V.F., Merzlikina E.I., Hoang Van Va. Indirect Frequency Optimality Indicators for Automatic Tuning of Controllers: Consideration of the Dependence on the Process Model Parameters. Bulletin of MPEI. 2019;6:106—114. (in Russian). DOI: 10.24160/1993-6982-2019-6-106-114.

Published

2019-02-20

Issue

Section

Automation and Control of Technological Processes and Production (05.13.06)