The objective of this paper is to design a robust PI controller for a second order system plus delay (SOSPD) which has an inherent nonlinearity by the virtue of its structural dynamics. An example of Dual Spherical Tank Liquid Level System (DSTLLS), which is non linear, has been chosen to analyse the performance of the robust PI controller designed. The DSTLLS has been linearized and modelled using black box modelling technique by performing the real-time experimentation and the performance of the applied controller has been analysed in simulation by MATLAB Simulink. This paper also discusses about the simulation efficiency using the performance indices like Integrated Squared Error (ISE) and Integrated Absolute Error (IAE). © 2015 IEEE.

Nithya Venkatesan

Electrical

School of Electrical Engineering

Chennai Campus

Chakravarthi M.K

Gupta K

Malik J

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Linearized PI controller for real-time delay dominant second order nonlinear systems

2015 International Conference on Control, Instrumentation, Communication and Computational Technologies (ICCICCT)

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TELKOMNIKA (Telecommunication Computing Electronics and Control)

Experimental Validation of a Multi Model PI Controller for a Non Linear Hybrid System in LabVIEW

The phenomenal growth that has been evidently seen in the last two decades has brought a multifold development in the process industry. The experts have always focused upon the control of t he level and other process parameters. In this study we have chosen a real time Single Spherical Tank Liquid Level System (SSTLLS) for our investigation. The aim of this study is to compare the design and implementation of different PI controllers for the SSTLLS using Lab VIEW and NI-DAQmx 6211 data acquisition card. The real time model identification and Graphical User Interface (GUI) are discussed and their PI controller implementation using Lab VIEW are outlined. © 2015 Asian Network for Scientific Information.

Asian Journal of Scientific Research

Design and Implementation of LabVIEW Based Optimally Tuned PI Controller for A Real Time Non Linear Process

International Journal of Control, Automation and Systems

Equivalent transfer function based multi-loop PI control for high dimensional multivariable systems

Using a single-symmetric relay feedback test, a method is proposed to identify all three parameters of a stable second-order plus time delay (SOPTD) model with equal time constants [k p exp(-Ds)/(τs + 1) 2]. The conventional analysis of the relay auto-tune method gives 27% error in the calculation of k u, for a large D/τ. In the present work, a method is proposed to improve the accuracy in the k u calculation by incorporating higher order harmonics. Three simulation examples are given for SOPTD and higher order time delay transfer function models. The estimated model parameters of the SOPTD model are compared with those of the Li et al. (1991) method and those of the Thyagarajan and Yu (2003) method. The open-loop performance of the identified model is compared with that of the actual system. The proposed method gives performance close to that of the actual system. Simulation results are also given for a nonlinear bioreactor system. The closed-loop performance of the model identified by the proposed method is close to that of the actual system. © 2012 Copyright Taylor and Francis Group, LLC.

Chemical Engineering Communications

AN IMPROVED RELAY AUTO TUNING OF PID CONTROLLERS FOR CRITICALLY DAMPED SOPTD SYSTEMS

A simple method is proposed to design PI/PID controllers for stable first-order plus time delay (FOPTD) systems. The method is based on matching the coefficient of corresponding powers of s in the numerator and that in the denominator of the closed loop transfer function for a servo problem. This method gives simple equations for the controller settings in terms of the FOPTD model parameters. Simulation results show that the method gives a similar response as that of Ziegler-Nichols (Z-N) method and better response than that of IMC method. Controllers are also designed by using two tuning parameters and the performance is best when compared to that of Z-N [ASME Trans. 64 (1942) 759] and Abbas [ISA Trans. 36 (1997) 183]. The controller settings give a robust performance for uncertainty in the process model parameters. The method is also extended to design PI/PID controllers for an unstable FOPTD system. Simulation results show that the present method gives improved performances: (i) for PID controllers over that of the controllers designed by Huang and Chen [J. Chem. Eng. Jpn. 32 (1999) 579], IMC method and that proposed by Visioli [IEE Proc. CTA 148 (2001) 180] and (ii) for PI controllers over the method of Jung et al. [J. Process Contr. 9 (1999) 265]. Theoretical analysis of stability and robustness of the proposed controller are also provided. © 2004 Elsevier Ltd. All rights reserved.

Computers and Chemical Engineering

A simple method of tuning PID controllers for stable and unstable FOPTD systems

Journal	Data powered by Typeset2015 International Conference on Control, Instrumentation, Communication and Computational Technologies (ICCICCT)
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