A Nonlinear Controller for Liquid Level Control System

IJSER © 2013 http://www.ijser.org Abstract— The aim of this paper is to investigate the coupled tank system that is supplied with a photovoltaic generator. Controlling variables in any process is very important so as to achieve the desired output A nonlinear control of an induction motor (IM) supplied with a photovoltaic generator to assure the level control of two coupled tanks. The proposed systems are separated into two independent models so that the coupled tanks are assured by discontinuous command by using the proposed methods. In the first step, we propose a sliding mode technique to make the speed and the flux control of the IM robust to parameter variations. Thus, the aim is to assure the stability of the system autonomously towards a desired region of water level, by varying the speed of the induction motor. The use of the nonlinear sliding mode provides a very good performance for motor operation and robustness of the control law despite the external and internal perturbation. Simulation results are given to highlight the performance of the proposed control method for load disturbances and parameter variation. A nonlinear control of an induction motor (IM) supplied with a photovoltaic generator to assure the level control of two coupled tanks is designed with sliding mode and fuzzy logic.