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Design and assessment of variable-structure LQG PID multivariable controllers
, Article Optimal Control Applications and Methods ; 2016 ; 01432087 (ISSN) ; Nobakhti, A ; Sharif University of Technology
John Wiley and Sons Ltd
2016
Abstract
Control Performance Assessment (CPA) and tuning of PID controllers are studied in this paper. We propose a framework for systematic analysis of the tradeoff between the structural complexity of the controller and its performance. As the measure of the controller performance, an LQG based index is used. The problem is augmented with an additional term which forces sparsity on the complexity of a decentralized PID controller. The desired complexity is controlled via a weighting parameter which determines the cost of each additional element (i.e., P, I, and D terms). The result is a decentralized multivariable PID controller in which the complexity of each loop controller is optimized such that...
Design and assessment of variable-structure LQG PID multivariable controllers
, Article Optimal Control Applications and Methods ; Volume 38, Issue 4 , 2017 , Pages 634-652 ; 01432087 (ISSN) ; Nobakhti, A ; Sharif University of Technology
John Wiley and Sons Ltd
2017
Abstract
Control Performance Assessment (CPA) and tuning of PID controllers are studied in this paper. We propose a framework for systematic analysis of the tradeoff between the structural complexity of the controller and its performance. As the measure of the controller performance, an LQG based index is used. The problem is augmented with an additional term which forces sparsity on the complexity of a decentralized PID controller. The desired complexity is controlled via a weighting parameter which determines the cost of each additional element (i.e., P, I, and D terms). The result is a decentralized multivariable PID controller in which the complexity of each loop controller is optimized such that...
Performance Assessment of PID Controllers based on MV and LQG Criteria
, M.Sc. Thesis Sharif University of Technology ; Nobakhti, Amin (Supervisor)
Abstract
In this thesis, a new method for the design and Control Performance Assessment (CPA) of the Rrestricted-Structure (R-S) PID controllers family (P, I, PI, PD …) is proposed. The proposed method is capable of a systematic analysis of the tradeoff between the structural complexity of the controller and its performance.During the past two decades, control performance assessment has attracted much at- tention from academic and the industrial researchers. One of the most recent tools is the RS-CPA, proposed by Grimble in which restricted structure controllers such as the PID are assessed against optimal LQG measures. When one is able to impose a specific structure onto the controller, such as a...
Decentralized multivariable PID controller with pre compensator for gas turbine system
, Article 2017 IEEE 4th International Conference on Knowledge-Based Engineering and Innovation, KBEI 2017 ; Volume 2018-January , 2018 , Pages 0074-0082 ; 9781538626405 (ISBN) ; Azizi, A ; Nourisola, H ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
In this paper, a restricted structure of PID controller is proposed for automobile gas turbine by considering a LQG cost function. So PID Controller coefficients are calculated by minimizing this cost function. One of the most important characteristics of this approach, its ability to design various structure PID controllers by solving optimization problem only for one time, moreover it can approximate main optimization problem by a repetitive Quadratic optimization Problem (QP). This approach is convex optimization and has an analytic solution; therefore its calculations are not complicated. In defined cost function, there are two weighting functions, control error and control action; they...