INTERNATIONAL CONFERENCE ON APPLIED RESEARCH IN COMPUTER, ELECTRICAL AND INFORMATION TECHNOLOGY | Year:2020 | دوره:5 |Papers Count:2

Due to increase in application of nonlinear load, sensitive equipment, electronic power control in industrial area and power quality of internal region achieves significance of increasing utilities and users. But nonlinear loads and non-zero impedance of the system might generate a lot of disturbance in the system. Most common disturbances include voltage sag, voltage swell, voltage difference, harmonic and etc. When the aforementioned disturbances stop generation process, lots of economic losses occur. Such problems can be solved using an equipment with series connection called dynamic voltage restorer (DVR). Modeling and simulation of the proposed DVR is performed using MATLAB/SIMULINK. In this paper, fuzzy logic is used to improve DVR behavior in compensating voltage flash in the network. Simulations show that performance of DVR in balancing voltage sag/swell is efficient and satisfactory. DVR controls both balanced and unbalanced situations with sufficient efficiency/precision and injects proper voltage component so that any deviation in source voltage for preserving load voltage is modified. Results of this paper are compared with other articles which have used PI controller and comparison results show that the present method outperforms others. Main advantages of the proposed DVR include simple, efficient and fast matching control.

Color image can provide more information than gray image, so it is used more widely in the field of the communication. Protecting this image from unauthorized users, has become critical issue nowadays. In recent years, the chaos-based image encryption algorithms have attracted a lot of attention because of their dynamic behaviors. This paper introduces a new color image encryption algorithm based on three-dimensional chaotic economic map. It encrypts three channels of the image Simultaneously, in which, every channel has its own initial key. Also every initial key affects on other two channels. Therefore, in the decryption process, even an invalid initial key makes the decrypted image obscure from original image. An implementation of the proposed encryption and decryption algorithms is performed and the obtained results show that the algorithm can successfully encrypt and decrypt the color image with the same keys. The security of proposed algorithm has been verified by experimental evaluations and security analysis and shown by implementing on different types of color images.