AC طراحي و ساخت فيلتراكتيو وفقي براي تخمين دقيق و حذف اغتشاشات شبكه هاي

Design And Implementation of Adaptive Active Filters for Exact Estimation And Elimination of AC Network Distortions

In recent years, active filters have been considered and developed for elimation of harmonics in power networks. Comparing with passive, they are smaller and have better compensating characteristics and resistance to line distootions. In this paper, a novel idea based on adaptive filter theory in presented to develop an acrive filter to eliminate the distortions of an arbitrary signal, Using this idea, new methods of active power filters, are introduced to remove harmonic distortions in single phase power networks. Stability of these methods are analysed and the simulation results are shown. Design and implementation of this adaptive active filter are done and the performance and advantages of this technich are affirmed by the practical results. Exact estimation of amplitude, frequency and phase of input signal first harmonic is the most important advantage of this adaptive technich. Furthermore, this method is for canceling the harmonics of any arbitary signal and can easily be modified for other systems, and three phase networks. Due to its adaptive nature, this technich can adapt itself with variations in environment and system parameters and be adjusted for optimal behaviour.