In this paper, a novel control scheme is proposed on the basis of the well-known Smith predictor for the control of integrating processes with long time delay. It can provide one and half degree-of-freedom for the closed loop system tuning. Systematic design procedure is developed by employing optimal control theory, and simple and efficient tuning rules are derived analytically. It is shown th...

Finding good controller settings that satisfy complex design criteria is not trivial. This is also the case for the simple three parameter pid controller. One strategy is to formulate the design problem into an optimization problem. However, when using gradient-based optimization, the algorithm often fails to converge to the optimal solution. In many cases this is a result of inaccuracies in th...

The main aim of the paper is to present a Matlab program for control of time-delay systems using three various modifications of Smith predictor. The software implementation includes the modification for unstable and integrating processes, PI-PD modification for systems with long dead time, and modification applying control design by Coefficient Diagram Method (CDM). The freely downloadable prog...

This paper examines the inverse control problem of nonlinear systems with stable dynamics using a fuzzy modeling approach. Indeed, based on the ability of fuzzy systems to approximate any nonlinear mapping, the nonlinear system is represented by a Takagi-Sugeno (TS) fuzzy system, which is then inverted for designing a fuzzy controller. As an application of the proposed inverse control methodolo...

with Communication Delays ASHU AHUJA, S. K. AGGARWAL 2 Electrical Engineering Department, Maharishi Markandeshwar University, Mullana, INDIA [email protected], [email protected] Abstract:The presence of communication delay in modern load frequency control (LFC) systems complicates the design and implementation of the controller to achieve robust performance of the system. In th...

A modiÞcation of the Smith Predictor Control schemes is introduced. This modiÞcation consists in a periodical resetting of the initial condition of the predictor. It allows to extend the use of these control laws to unstable linear systems with delay. The continuous and discrete implantation of this scheme is considered. The stability of the scheme is proved and sufficient conditions for robust...

Aiming at the uncertainty of model parameters and dominate time delay of the controlled object in feed water system of boiler, combined with improved Smith predictor control method and fuzzy immune PID control method, improved Smith predicting controller based on fuzzy immune is designed. Fuzzy Immune PID controller can self-tune parameters, and has adaptive capacity to the diversification of c...

Abstract: This paper presents a new method for a PID-control design in which the PID-control loop is represented as an equivalent one to a control loop operating with an optimized PI-controller and a Smith predictor. It requires the nearest approximation of the power plant process description and the dead-time transfer function. The presented method is based on the PID-controller transfer funct...

In this paper, a new approach to design a robust gain scheduled linear parameter varying (LPV) PID controller with pole placement constraints (through LMI regions) is proposed for LPV systems with second order structure and time-varying delay. The controller structure includes a Smith predictor, real time estimated parameters that schedule the controller and Smith predictor (using the known par...

Networked control system is essentially a closed loop system with a plant and controller, with the plant located in a remote area and controlling done through data communication networks. This depicts a nonlinear plant with stochastic time delay. This paper offers comparison of three models one of which is a novel method. Fuzzy logic controller is the best option amongst the conventional contro...