Artificial Neural Network Model of Discharge Lamps in the Power Quality Context
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Artificial Neural Network Model of Discharge Lamps in the Power Quality Context André Luiz Andreoli · Denis Vinicius Coury · Mario Oleskovicz · Paulo José Amaral Serni
Received: 2 September 2011 / Revised: 16 April 2012 / Accepted: 13 August 2012 / Published online: 25 April 2013 © Brazilian Society for Automatics–SBA 2013
Abstract This paper presents a methodology for modeling high intensity discharge lamps based on artificial neural networks. The methodology provides a model which is able to represent the device operating in the frequency of distribution systems, facing events related to power quality. With the aid of a data acquisition system to monitor the laboratory experiment, and using MATLAB® software, data was obtained for the training of two neural networks. These neural networks, working together, were able to represent with high fidelity the behavior of a discharge lamp. The excellent performance obtained by these models allowed the simulation of a group of lamps in a distribution system with shorter simulation time when compared to mathematical models. This fact justified the application of this family of loads in electric power systems. The representation of the device facing power quality disturbances also proved to be a useful tool for more complex studies in distribution systems. Keywords Power quality · Discharge lamp · Computational model · Artificial neural networks · Electrical system simulation A. L. Andreoli · D. V. Coury · M. Oleskovicz (B) Department of Electrical and Computing Engineering, São Carlos School of Engineering, University of São Paulo, Av. Trabalhador São-Carlense, 400, São Carlos, São Paulo, CEP 13566-590, Brazil e-mail: [email protected] A. L. Andreoli e-mail: [email protected] D. V. Coury e-mail: [email protected] P. J. A. Serni Department of Electrical Engineering, São Paulo State University, Av. Eng. Luiz Edmundo Carrijo Coube, 14-01, Bauru, São Paulo, CEP 17033-360, Brazil e-mail: [email protected]
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1 Introduction The search for efficient lighting systems for many years led to the use of discharge lamps, which offer much greater efficiency compared with their incandescent equivalents of the same power. In contrast to their efficiency, it is known that the nonlinear aspect of discharge lamps contributes to the deterioration of power quality (PQ), especially considering the high current harmonic content required by these devices. In the same way that discharge lamps produce disturbances associated with PQ, they are also sensitive to disturbances in the quality. In particular, high intensity discharge lamps appear quite sensitive to voltage sags and become inoperative at certain voltage levels or when the supply is interrupted, for a short period. When these situations occur, a long period of time is necessary to restart the lamps. This aspect is particularly relevant when, for example, one considers the effect on the safety of illuminated places, whether this be a vehicle traffic thoroughfare, a street with pedestrian traffic or an industrial environment
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