Volume : 4, Issue : 4, April - 2015

Comparison of various Wavelet Tranforms Families available in MATLAB for Locating Power Quality Disturbances.

Tushar A Patel, Mudassir A Maniar

Abstract :

<p>&nbsp;Modern electric power system consists of highly non linear load due to introduction of highly sophisticated electronic&nbsp;</p> <div>control at almost all the level power utilization. This modern electrical equipments and machineries along with solid&nbsp;</div> <div>state control are highly efficient, flexible has large number of advantages; however they have created a serious power&nbsp;</div> <div>quality issues like voltage sag, voltage swell and flicker etc. Wavelet transform allows the detection and localisation of disturbances in the&nbsp;</div> <div>voltage waveform. It is possible to use several tools, such as the MATLAB that includes basic commands and a graphic environment. Various&nbsp;</div> <div>wavelet transform methods are available in MATLAB. The most important is to select appropriate wavelet for particular application which is&nbsp;</div> <div>dictated by signal and its characteristics. If we understand the properties of the analysis and synthesis wavelet, we can choose a wavelet that is&nbsp;</div> <div>optimized for our application. This paper presents wavelet transform as tool for location of PQ disturbance. In this paper voltage sag, swell and&nbsp;</div> <div>impulse are simulated using MATLAB code, various wavelet decomposition techniques are applied, compared and reported.&nbsp;</div>