Enhancing Power Quality Using Fuzzy Logic for Microgrid System

Abstract

In this project a powerful control and integration technique of the proposed UPQC in a distributed generation (DG)-based grid connected micro generation (μG) system is presented. The control technique of the presented UPQC μG is enhanced by implementing an intelligent islanding and novel reconnection technique with reduced number of switches that will ensure seamless operation of the μG without interruption. The shunt part of the UPQC Active Power Filter is placed at the Point of Common Coupling (PCC) and series part of the UPQC is connected before the PCC and in series with the grid. The dc link can also be integrated with the storage system. An intelligent islanding detection and reconnection technique (IR) are introduced in the UPQC as a secondary control. Hence, it is termed as UPQCµG−IR. The advantages of the proposed UPQCµG−IR over the normal UPQC are to compensate voltage interruption in addition to voltage sag/swell, harmonic, and reactive power compensation in the interconnected mode. During the interconnected and islanded mode, DG converter with storage will supply the active power only and the shunt part of the UPQC will compensate the reactive and harmonic power of the load. It also offers the DG converter to remain connected during the voltage disturbance including phase jump. An intelligent islanding detection and reconnection technique (IR) are introduced in the UPQC along with fuzzy logic as a secondary control. Hence, it is termed as UPQCµG−IR. During the interconnected and islanded mode, DG converter with storage will supply the active power only and the shunt part of the UPQC will compensate the reactive and harmonic power of the load. The simulation results are presented by using Matlab/Simulink software.

Key words:Distributed generation (DG), intelligent islanding detection (IsD), microgrid, power quality, smart grid, unified power quality compensator (UPQC), fuzzy logic controller.