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proportional-integral--pi--controller
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Fault-tolerant controller design for ALSTOM gasifier benchmark challenge
, Article Journal of Advanced Research in Dynamical and Control Systems ; Volume 7, Issue 1 , 2015 , Pages 90-116 ; 1943023X (ISSN) ; Babazadeh, M ; Sharif University of Technology
Institute of Advanced Scientific Research, Inc
2015
Abstract
In this paper, a new fully decentralized control strategy for the ALESTOM gasifier benchmark is presented. The proposed decentralized fault-tolerant control scheme overcomes the conventional drawbacks of the previously developed centralized strategies for the linearized model of gasifier system. To achieve the objective, first, the best pairing has been selected based on integrity screening tools as well as physical considerations. Then, a fully decentralized Proportional Integral (PI) controller has been proposed. Finally simulation results performed in MATLAB show that the designed controller is capable of achieving desired performance for three different scenarios, i.e., full, half and no...
Design and Implementation of an Iterative Learning Controller on Quadcopter Drone
, M.Sc. Thesis Sharif University of Technology ; Rezaeizadeh, Amin (Supervisor)
Abstract
In this thesis, black-box identification, designing and implementing an iterative learning controller for the quadcopter was performed. Initially, the open-loop quadcopter system is unstable, so for black-box identification, a controller must first be implemented to stabilize it, but since no model is available from the system, the controlling parameters of the stabilizer through a proportional-integral and a proportional controller are executed as trial and error. To identify the roll and pitch models, the quadcopter is carried out using a radio controller and the measurements are saved during flight. Different models and methods are used to black-box identification, and finally the best...
PI design based on DMC strategy
, Article Transactions of the Institute of Measurement & Control ; Volume 27, Issue 1 , 2005 , Pages 21-36 ; 01423312 (ISSN) ; Sharif University of Technology
2005
Abstract
Proportional and integral (PI) control parameters are determined by approximating a dynamic matrix control (DMC). Since accuracy of the approximation depends on DMC parameters in a complicated manner, a combination of direct and indirect optimization methods are employed in this paper. Quadratic programming (QP) is used to determine PI parameters, and a simple grid method is used to find optimal DMC parameters. A tuning formula for the PI controller based on a curve-fitting technique, is suggested. Computer simulations are performed to compare performance of the new PI design method with those achievable using some existing PI controllers. © 2005, Sage Publications. All rights reserved
Multivariable Predictive Control of a Fuel Cell-Micro Turbine Hybrid System
, M.Sc. Thesis Sharif University of Technology ; Pishvaie, Mahmoud Reza (Supervisor)
Abstract
High efficiency and low-emission fuel cells have the capacity to replace fossil fuels for energy supply concerns. Solid oxide fuel cells operate in relatively high temperature and have power plant applications. Hence, they are acquainted to be coupled with cycle gas turbine to reduce the cost and increase the overall system efficiency. The control of these hybrid systems is so important. Due to the system nonlinearity and having more than one controlled variable, its control with classic methods would be difficult. The model based predictive control is used as an alternative to mitigate these difficulties. In addition to their high performance, their extension to the multivariate case would...
Simulation and Design of Controller for Production of Acetic Acid in a Bioreactor
, M.Sc. Thesis Sharif University of Technology ; Shahrokhi, Mohammad (Supervisor) ; Vafa, Ehsan (Supervisor)
Abstract
Due to advances of biotechnology, control of bioprocess has become very important. The goal of this project is to simulate the acetic acid production bioreactor and designing an adaptive PI controller for this reactor. For this goal, a suitable model has been selected from the literature and simulation has shown that the system has a nonlinear dynamical behavior. In order to control the system in a wide range of operating conditions, the adaptive PI controller was designed. In single input-single output case, the concentration of the product is controlled in such a way that the production rate is maximized, assuming that the pH and temperature are kept constant. Then a two input-two...
Design and Implementation of an Assistive Controller to Maintain Patient Equilibrium, for a Balance Training Device
, M.Sc. Thesis Sharif University of Technology ; Behzadipour, Saeed (Supervisor)
Abstract
Each year, from %30 to %60 of the elderlies fall down. %10 to %20 of these incidents result in severe injuries. Aging along with stroke can possibly damage body balance system temporarily or permanently. Therefore, human body balance system improvement and treatment seems necessary. Physical therapy methods relying on assistance require not only physiotherapist presence, but also considerable amount of money and time for both patient and physician. Thus, novel rehabilitation methods that do not require physiotherapist presence can help patients greatly. To do so, an apparatus has been designed and fabricated at Sharif University of technology. This apparatus can produce the active...
Design and Implementation of a Multi-Objective Controller for a Home-Based Balance Training Device
, M.Sc. Thesis Sharif University of Technology ; Behzadipour, Saeed (Supervisor)
Abstract
Each year from %30 to %60 of the elderlies fall down. %10 to %20 of these incidents result in severe injuries. Aging along with stroke can possibly damage body balance system temporarily or permanently. Therefore, human body balance system improvement and treatment seems necessary. Physical therapy methods relying on assistance require not only physiotherapist presence, but also considerable amount of money and time for both patient and physician. Thus, novel rehabilitation methods that do not require physiotherapist presence can help patients greatly. To do so, an apparatus has been designed that— using force plate— enables mass center detection as well as visual report to patient. The...
Completion of Electromagnetic System and Design of Robust Controller to Control the Movement of Micro-robots in Three-Dimensional Space
, M.Sc. Thesis Sharif University of Technology ; Nejat Pishkenari, Hossein (Supervisor)
Abstract
Today, the need to access very small environments is felt in various medical, industrial, biological and military fields. Due to their small size, microrobots have the ability to perform tasks that would be very difficult to do on a larger scale, but this ability of microrobots makes feeding and controlling them challenging. There are several methods for providing power and control of microrobots, which include their internal or external stimulation, among which the magnetic stimulation method is used in this research, which does not cause damage to body tissues.In this thesis, an electromagnetic system with nine cylindrical coils is used to control the three-dimensional movement of magnetic...
Optimal Design of Implementable Fractional-order PI and PID Controllers for Time-delay LTI Systems
, M.Sc. Thesis Sharif University of Technology ; Tavazoei, Mohammad Saleh (Supervisor)
Abstract
Benefiting from the great potential of the mathematical tool of fractional calculus, fractional order proportional integral (FOPI) and proportional integral derivative (FOPID) controllers have been proposed as the next generations for the popular PI and PID controllers. On the other hand, the integral performance indices such as the integral square error (ISE), integral square time error (ISTE), integral absolute error (IAE) and integral time absolute error (ITAE) are commonly used in design and evaluate of the performance of practical control systems. Considering these points, the present thesis deals with optimal tuning of the free parameters of fractional order PI and PID controllers, to...
Robust Power Control of Wind Turbine with Smooth Switching between Operational Regions using a Two-mass Model
, M.Sc. Thesis Sharif University of Technology ; Moradi, Hamed (Supervisor)
Abstract
Wind turbines have been the subject of many researches in recent decades. Optimization and continuous improvement of these systems play a decisive role in the development and exploitation of wind farms. Wind turbines can be studied from several aspects such as structure, dynamics, aerodynamics, electricity and control. In this research, robust power control of the wind turbine has been studied with emphasis on accurate 2 DOF mechanical and aerodynamic modeling. Aerodynamic coefficients of the turbine have been calculated using the numerical methods and the effect of this numerical modeling has been studied in comparison with the analytical methods on the turbine power control. Several new...
Optimal Specified-Structure Controller Design for a Linear Process using Output Feedback
, M.Sc. Thesis Sharif University of Technology ; Mobed, Mohammad (Supervisor) ; Karimi Ghartemani, Masoud (Supervisor)
Abstract
The problem of LQR design based on full state feedback is solved completely in the subject of Optimal Control. So far, however, despite the fact that use of output feedback in many applications of Control is desirable or even necessary, designing optimal controllers using output feedback in general does not seem to have received much attention in the existing literature. Of course, special cases of designing simple controllers using analytical or numerical-analytical methods do exist in the literature. A new algorithm for tuning an optimal controller (P, PI, PID, etc) for a low-order system without delay, and also in the presence of delay, has been introduced in this thesis using the LQR...
Load-frequency control of interconnected power system using emotional learning-based intelligent controller
, Article International Journal of Electrical Power and Energy Systems ; Volume 36, Issue 1 , March , 2012 , Pages 76-83 ; 01420615 (ISSN) ; Boroushaki, M ; Hosseini, S. H ; Sharif University of Technology
2012
Abstract
In this paper a novel approach based on the emotional learning is proposed for improving the load-frequency control (LFC) system of a two-area interconnected power system with the consideration of generation rate constraint (GRC). The controller includes a neuro-fuzzy system with power error and its derivative as inputs. A fuzzy critic evaluates the present situation, and provides the emotional signal (stress). The controller modifies its characteristics so that the critic's stress is reduced. The convergence and performance of the proposed controller, both in presence and absence of GRC, are compared with those of proportional integral (PI), fuzzy logic (FL), and hybrid neuro-fuzzy (HNF)...