Design & Analysis of an Unipolar DC-Microgrid System under Variable Loading Condition

The use of power electronics-based instruments has increased the harmonics in the AC distribution system, which is very tedious to control. They are for the DC distribution system may be adopted to avoid such a harmonics problem. The advantages of the DC system over the AC system have made it possible to design the DC micro grid system where the point of generation and the point of utilization are closer to each other. However, the protection of DC micro grid is and very critical issue from a control and operation point of view as there is no zero-crossing. A substantial increase in the DC fault current may lead to a permanent shutdown of DC lines. To address these issues in this paper a research work has been carried out for checking the variation of load on the performance of protection features in a DC micro grid system. The system has been investigated with a Matlab Simulink model.