Integration of fuzzy logic controlled UPQC to micro grid with seamless reconnection and islanding mode.

Abstract

Unified power quality conditioners (UPQCs) allow the mitigation of voltage and current disturbances that could affect sensitive electrical loads while compensating the load reactive power. Installation of minor power generation equipment at load facilities in power distribution system called distributed generation (DG) has become trendy these days. This paper illustrates the UPQC connected to DG micro-grid. DG system operating in grid connected mode and islanding mode were described. The paper mainly focuses the micro-grid seamless reconnection technique from islanding mode to grid connected mode using fuzzy controller. Algorithm for islanding detection in micro-grid for islanding reconnection (IR) is depicted. 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 algorithm with proposed system was validated with results obtained using MATLAB/SIMULINK software.