POWER QUALITY ISSUES IN AC MICROGRID

Abstract

The rising number of distributed energy systems and the ongoing changes in operating requirements generally have a negative impact on power systems. In order to improve power transmission, this research suggests a novel idea for power-control techniques for a micro grid generating system. The micro grids are created using common renewable energy sources, and this idea offers the highest possible power usage in pollution-free circumstances with minimal losses, which also increases system efficiency. By applying control techniques created for shunt active hybrid filters, such as series and shunt converters, distortions in the power system caused by changes in load or the use of non-linear loads may be prevented. The microgrid system essentially consists of a number of loads and several micro sources working together to generate power. A microgrid system's structure is made up of several components, including interface control, control and protection devices for each micro source, microgrid voltage management, power flow regulating devices, load sharing during islanding situations, protection, and stability. Another crucial feature is the Microgrid's capacity to work when linked to the grid and its ability to smoothly switch between island and grid mode. The influence of power quality issues on the entire power systems is the primary factor for microgrid connections to the distribution system. These power quality issues are often categorized as harmonic contents in load current and voltage and frequency abnormalities in grid voltage. This research suggests a flexible ac distribution system for microgrid as a solution to these kinds of power quality issues. This thesis’s major goal is to clarify the issues with power quality in a micro grid system. In order to increase the dependability and power quality of the microgrid connected distributed system, an UPQC with fuzzy controller is used in simulation model in this work. A new control algorithm is created for the FACTS devices in order to enhance the system's power quality. In this study, the fuzzy controller is also used along with unified power quality conditioner (UPQC) to improve the power quality in a micro grid. Using MATLAB/Simulink, the design concept is examined in various situations of power quality disturbances.