Cause Based Analysis of Power Quality Disturbances in a Three Phase System

The massive increment towards the activities in the area of power quality (PQ) is due to switching events, faults, nonlinear loads and increased usage of power electronic converters. These are causing PQ disturbances like voltage sag, voltage swell, interruption, harmonics, and waveform distortion etc. Overheating of electronic components, corrupted data and equipment failure are some of the common symptoms of poor PQ in the distribution system. The various types of the voltage sags are the main PQ disturbances which need attention and their respective mitigation. Different types of voltage sags have been investigated on the transmission side and as well on the distribution side due to occurring of the various types of line faults. All these voltage sags has been simulated and analyzed with MATLAB software. Furthermore, underlying causes of this PQ disturbance analysis has been simulated and discussed with the need of linking these with the respective PQ disturbances.