SYNCHRONISED FILTERING OF THE FUNDAMENTAL COMPONENT OF VOLTAGE ANDCURRENT IN POWER LINE

Abstract

Power system has witnessed increase in power electronics load which operates on switching of the devices. This has brought the increase in undesirable frequency component in the power lines in the form of current and in the voltage. Analysis, measurement, compensation and operation control becomes difficult amidst such conditions. Filter as the name suggests, filters out the undesirable frequency component of a signal. Filtering of noise from signal is being used for signal processing applications. The synchronised extraction of fundamental frequency signal component has always been considered a daunting task for application engineers to advocate application of signal processing and power apparatus to Electrical systems. The main goal of this work is to develop a synchronised and adaptive filter that can track the fundamental component of current and voltage received from the power line, amidst high and low frequency components without delay. The current or voltage signal obtained from the power line feeding power to power electronics converters is distorted with harmonics and or loss of frequency component, besides this the uncertainties in power line; change of frequency, phase and dynamics of load makes the filtering process very complex and difficult. The proposed work aims at extraction of the fundamental component of source current and voltage amidst harmonic distortion through a tunable synchronized filter scheme. The input voltage waveform is filtered through tunable adaptive filter to produce delay less fundamental frequency component. Analysis design and development of new filter system is presented in this thesis. Simulation, as well as the generation of the test signals, is realized in the Matlab Simulink environment.