Authors : Abdul-Jabbar Fathel Ali, Wael Hussein Zayer and Samhar Saeed. Shukir
Abstract: Recently a large interest has been focused on power quality domain due to: disturbances caused by the non-linear loads, increase in the number of electronic devices and growth of renewable energy sources. Power quality measures the efficiency of electric power transmitted from generation to the industrial, domestic and commercial consumers. At least 50% of power quality problems are of voltage quality type. In a power system voltage sags and voltage distortion introduced by harmonics are considered to be the most severe affecting power quality because of both utilities and consumers are affected by these disturbances. These problems could be solved by: design equipments and electrical systems to prevent electrical disturbances from causing equipments or systems to malfunction, analyze the symptoms of a power quality problems to determine its causes and solutions, study the medium that is transmitting the electrical disturbance and eliminate or reduce the effect of that medium, treat the symptoms of the power quality problems by using the power conditioning device and custom power device. This study, presents the power quality problems such as sags, swells, harmonics, voltage interruptions and transient and presents power quality enhancement techniques which are two categories power conditioning devices and custom power devices the second method is the most efficient and effective method to solve the power quality problems and protective the sensitive loads from power disturbances. The modeling and simulation of a power distribution system was achieved using MATLAB/Simulink. Three phase fault and double line to ground fault are created with the proposed system and the faults are initiated at a duration of 0.8 sec and keep till 0.95 sec. Dynamic Voltage Restorer (DVR) is used to treat the power quality problems.
Abdul-Jabbar Fathel Ali, Wael Hussein Zayer and Samhar Saeed. Shukir, 2019. Power Quality Prolems and Improvement Techniques. Journal of Engineering and Applied Sciences, 14: 5888-5898.