Ideal Scheme of Protection in Micro-Grid System
This review establishes two major protection issues that must be dealt with to ensure stable operation of a Micro grid during any contingency. To determine at what instant the Micro grid should be islanded under a specific contingency To sectionalize the stand-alone Micro grid and provide the sections with sufficiently co-ordinate fault protection. Although the characteristics and performance of most protection elements of a Micro grid are consistent with those present in the utility distribution systems, it is not the same for the micro source power electronic inverter systems because of the following reasons. Characteristics of inverters may not be consistent with the existing conventional protection equipment. Different inverter designs have different constants and therefore, do not have any uniform characteristic that would represent inverters as a class of equipment. Basic characteristics of the inverter unit as seen by the system can change markedly depending on design and application.