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ISSN 1392 – 124X INFORMATION TECHNOLOGY AND CONTROL, 2007, Vol.36, No.2 OPTIMIZATION OF PARAMETERS OF THE UNIFIED POWER QUALITY CONDITIONER USING GENETIC ALGORITHM METHOD Chellali Benachaiba, Ottmane Abdelkhalek, Samira Dib, Mohamed Haidas Bechar University Center BP 417 Bechar 08000, Algeria Abstract . This paper presents a novel technique of optimization of parameters of the UPQC using Genetic Algorithm (GA) method that takes curves of bode as a basis. The choice of the parameters of the shunt active filter is determined by the ratio of its generated current to the harmonic current, while the choice of the parameters of the series active filter is determined by the ratio of its generated voltage to the harmonic voltage. The total impedance of the whole system without load shows that a phenomenon of resonance could appear. To overcome the problem of reso- nance and widen the pass band, the Genetic Algorithm method was used. Simulation results are presented to validate the proposed method. Keywords: UPQC, Shunt Active Filter, Series Active Filter, Harmonic, THD, GA. 1. Introduction The main objective of this work is the improve- ment of the performances of UPQC with respect to the variation of the frequency. In order to achieve this goal, we present in this paper, a new method based on GA which allows the determination of the optimized parameters and consequently an optimal operating point of the system, a wide pass band with a unity gain of both the ratio of the compensating voltage to the voltage generated by the series PWM converter and the ratio of the compensating current to the current generated by the shunt PWM converter, and a no load normal total impedance, in other words without reso- nance. The results given by the GA method is com- pared with the results given by the classical method, which uses iterative calculations under certain condi- tions to find the optimal parameters that satisfy all constraints. The GA method seems to be more effi- cient and gives better results. Therefore, the following presented results are interesting and confirm the effi- ciency of the proposed new method. The electric power industry in the 21 st century will see dramatic changes in both its control and commu- nication infrastructure. These changes are the result of mainly three factors: 1) the push toward a deregulated industry, 2) the development of more efficient and/or less polluting energy resources that are cost competi- tive with traditional power generation sources, and 3) the continued electrification and integration of infor- mation technology into most facets of our everyday lives has resulted in a need for a better reliability and improved power quality than the existing power grid can supply. In this context and with the progress of electronics component technology some efficient solu- tions as the unified power quality conditioner (UPQC) [1] are used. It consists of combined series and shunt active filters [2-8] for simultaneous compensation of voltage and current.
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This note was uploaded on 09/28/2010 for the course EPS 090229 taught by Professor Nxhviet during the Winter '10 term at Hanoi University of Technology.

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