DefinePK

Abstract

The increased use of power electronic controlled equipment, such as variable speed drives, automated production lines, personal computers and non-linear electronic devices in power systems has given rise of voltage and current waveform distortion called as ‘harmonics’. Harmonic disturbances is one of the major issue in the power system. The harmonic source effectively disturb the industrial and customer power utility by changing the property of power stability. In order to determine the causes and sources of harmonic disturbances, it must started with the ability to detect the location of these disturbances. The harmonic source detection by using modelling the equivalent electric network is difficult to get an accurate equivalent circuit model because of loads changing dynamically. Thus, an automated way is required to identify the harmonic source disturbances. The analysis of harmonic sources disturbances using periodogram is presented in this paper. The periodogram is used to analyze the signal and represented the parameter of signals in power spectrum. Hence, the parameter signal are used to calculate the location of harmonic sources disturbances. The signal parameters such as RMS voltage, RMS current and difference angle of current and voltage are estimated from the power spectrum to identify the characteristic of harmonic disturbances. As a result, the characteristic of harmonic disturbances such as harmonic at downstream, upstream and both sides are identified based on harmonic impedances are presented in power spectrum. The difference characteristic of these harmonic source such as the difference magnitude of harmonic impedances are presented in result section. The end of this section, the new technique to identify the harmonic sources disturbances are presented and this technique is suggested to create a system for identify the harmonic sources disturbances.