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

Volume : IV, Issue : IV, April - 2015

Tushar A Patel, Mudassir A Maniar

Modern electric power system consists of highly non linear load due to introduction of highly sophisticated electronic

control at almost all the level power utilization. This modern electrical equipments and machineries along with solid

state control are highly efficient, flexible has large number of advantages; however they have created a serious power

quality issues like voltage sag, voltage swell and flicker etc. Wavelet transform allows the detection and localisation of disturbances in the

voltage waveform. It is possible to use several tools, such as the MATLAB that includes basic commands and a graphic environment. Various

wavelet transform methods are available in MATLAB. The most important is to select appropriate wavelet for particular application which is

dictated by signal and its characteristics. If we understand the properties of the analysis and synthesis wavelet, we can choose a wavelet that is

optimized for our application. This paper presents wavelet transform as tool for location of PQ disturbance. In this paper voltage sag, swell and

impulse are simulated using MATLAB code, various wavelet decomposition techniques are applied, compared and reported.