Power Quality Improvement of Grid Connected PV System Using DFACTS Devices

Abstract

Abstract : This thesis aims to improve the power quality of a distribution network integrated with renewable energy sources by using Distribution Flexible Alternating Current Transmission Systems (DFACTS) devices. Renewable energy sources such as PV and wind power can distort the power quality, leading to fluctuated voltage, large frequency variations, reverse power flow, and many other issues concerning the stability of the grid. Moreover, the improvement of the DFACTS devices in this thesis will focus on designing a controller that will improve the network power quality by maintaining the voltage within the prescribed range. Various models of a network embedded with DFACTS devices will be designed and simulated simultaneously to compare and show the performance of each model. The tests will cover the reaction of the DFACTS device during multiple disturbance scenarios such as voltage drop, voltage rise, renewables trip, load variation, and unbalanced faults. The designed models will incorporate various controllers, such as the PI controller, Fuzzy controller, and Negative sequence controller, to mitigate different types of network disturbances. The results will show which model has a faster response time, better transient stability, and unbalanced fault detection and mitigation, as well as stating the thesis limitations and recommendations to further improve the project for future research.