Robust PI Control of a Laboratory Time-Delay Process

The chapter presents robust control of a laboratory process with a transport delay using the industrial control system SIMATIC. The controlled process is identified in the form of a transfer function of a higher order with a transport delay at first and then the transport delay is approximated by the first order Taylor series expansion of the numerator or the denominator. Because the transport delay can vary, the controlled laboratory process is modelled in the form of a transfer function with interval parametric uncertainty. Robust PI controllers are designed for the laboratory process. The method for synthesis of robust controllers is based on plotting the stability boundary locus in the (kp, ki) - plane and the subsequent choice of a stabilizing PI controller using the pole-placement method so that the prescribed behavior of the closed-loop is achieved.Z(MSM7088352102

Robust Proportional-Integral control of a laboratory model using Programmable Logic Controller SIMATIC S7-300

The main aim of the contribution is to present a possible approach to design of simple Proportional-Integral (PI) robust controllers and subsequently to demonstrate their applicability during control of a laboratory model with uncertain parameters through the Programmable Logic Controller (PLC) SIMATIC S7-300 by Siemens Company. The proposed and utilized synthesis consists of two steps - the former one is a determination of controller parameters area, which ensures the robustly stable control loop and which is based on the computing/plotting the stability boundary locus while the latter one lies in the final choice of the controller itself relying on algebraic techniques. The basic theoretical parts are followed by laboratory experiments in which the 3rd order nonlinear electronic model has been successfully controlled in various working points. © 2009 IFAC

Design of robust PI controllers and their application to a nonlinear electronic system

Článek se zabývá návrhem robustních PI regulátorů a jejich aplikací na nelineární elektronický systém.The principal aim of the paper is to present a possible approach to design of simple Proportional-Integral (PI) robust controllers and subsequently to demonstrate their applicability during control of a laboratory model with uncertain parameters through the Programmable Logic Controller (PLC) SIMATIC S7-300 by Siemens Company. The proposed and utilized synthesis consists of two steps. The former one is a determination of controller parameters area which ensures the robustly stable control loop and which is based on the computing/plotting the stability boundary locus while the latter one lies in the final choice of the controller itself relying on algebraic techniques. The basic theoretical parts are followed by laboratory experiments in which the 3rd order nonlinear electronic model has been successfully controlled in various working points

Robust PI controller design for a laboratory time delay process

The paper presents an approach to robust PI controller design for systems with interval parametric uncertainty and time delay. It is supposed that the controlled system is described by a transfer function with parameters lying in certain intervals and with a time delay term. The transfer function of the controlled system is modified by approximation of the time delay term by its Pade expansion. The area of all PI controller parameters kp, k i, that are able to assure the robust stability of the feedback closed loop, is found by the method, which is based on plotting the stability boundary locus in the (kp, ki)-plane. Then the pole-placement method is used to specify those controller parameters from the robust stability area, which assure quality of the control performance prescribed by a choice of closed loop poles or relative damping or natural undamped frequency of the control response. The contribution presents theoretical results confirmed by practical experiments in laboratory conditions. Robust PI controllers are found using designed approach for control of an electronic equipment with varying time delay. Designed robust PI controllers are realized using the PLC SIMATIC S7-300. © 2010 IEEE

Synthesis of novel chiral 1,4-dihydropyridinyl Schiff-base ligands, with characterization and evaluation of calcium channel blocker activity

International audienc

Synthesis of novel chiral 1,4-dihydropyridinyl Schiff-base ligands, with characterization and evaluation of calcium channel blocker activity

International audienc