Analysis of Power Quality Disturbances in IEEE 14 Bus Test System

摘要

In recent times, the wavelet-based methodologies have been developed as suitable alternatives for the analysis of power quality (PQ) disturbance signals. Power quality monitoring is an essential service that many utilities maintain it for their industrial and larger commercial customers. The improvement in quality of power requires proper identification of source and cause the disturbances. So the detection of the different electrical disturbances which can cause PQ problems is a difficult task that requires a high level of engineering knowledge. The majority of the disturbances are non-stationary and transient in nature subsequently it requires advanced instruments and procedures for the examination analysis of PQ disturbances. In this work wavelet transform has been implemented for analysis of PQ disturbances. PQ disturbances have been generated by changing load in IEEE-14 bus system and decomposed utilizing wavelet decomposition algorithm for localization of disturbances. Two types of PQ events such as voltage sag and swell are analysed using Discrete Wavelet Transform (DWT) along with the normal sinusoidal signal. Each signal is decomposed up to four finer levels using DWT.