Phase-Locked Loop Controller for Three-Phase Unified Power Quality Conditioner for Non-linear and Voltage Sensitive Loads

In this study, a new efficient control system for a unified power quality conditioner is developed, which can reduce voltage variations such as sag and swell conditions, as well as current and voltage harmonic isolation in distribution systems.  The suggested control approach is utilised to model and simulate the UPQC that can be used at the PCC to improve power quality, and the results are compared by applying it to a distribution system that has and does not have UPQC. UPQC can be installed to protect the sensitive load inside the plant as well as to restrict entry of any distortion on the load side. The UPQC's performance was assessed using a typical industrial load and realistic characteristics supplied by a polluted distribution network. In the MATLAB/SIMULINK environment, a dynamic model of the UPQC is created, and simulation results proving system power quality improvement are provided for various supply and load circumstances.