POWER QUALITY IMPROVEMENT IN MICROGRID WITH FUZZY BASED UPQC

This paper considers the placement, integration, and control of Unified Power Quality Conditioner (UPQC) in Distributed Generation (DG)-based grid connected/autonomous micro grid/micro generation (µG) system with Fuzzy Logic Controller. The fuzzy controller is the most suitable for the human decision-making mechanism, providing the operation of an electronic system with decisions of experts. The DG converters (with storage) and the shunt part of the UPQC Active Power Filter (APFsh) are placed at the Point of Common Coupling (PCC). In this paper the UPQCµG−IR is used to compensate the voltage interruption along with voltage sag and swell, harmonic and reactive power compensation in the interconnected operation. The series part of the UPQC (APFse) 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. 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. The simulation was done by using MATLAB/Simulink software.