Design of voltage sag compensator with transformer inrush current mitigation technique

The power system survey results recommend that, voltage sag is the chief contributor in about 92% of manufacturing industries. Voltage sag results in decrease in competence of the systems which affect the manufacturers in terms of losses related to money and reliability. The transformer-coupled arrangement associated voltage-source inverter, called voltage sag compensator is among the most savvy arrangement against voltage sags. Transformers are mostly installed in front of critical loads for electrical separation purposes. When voltage dip occurs, the transformers are presented to the improper voltages and a dc offset occurs in its flux linkage. The flux linkage will be reach to the level of magnetic saturation at the time of compensator restores the load voltage and this cause's serious inrush current. The compensator may be interrupted because of its own over current protection, hence, the compensation gets failed, and the critical loads are interrupted by the voltage sag. This paper brings together a method for inrush current relief for voltage dip compensator with fuzzy logic controller. Voltage sag compensator along with additional parts of the distribution system is simulated using Matlab/Simulink.