Efficient Grounding Method for DC Microgrid with Multiple Grounding Points

DC microgrid (MG) is an important structure of future electrical power systems, with many advantages in off grid and application for grid connected operation. It is considered for its stability, safety, reliability, and optimum efficiency. Power produced with renewable energy sources or changes in different stages or for reliability issue is controlled by power electronic advices like converters and inverters. Although some researches could invent new methods for dealing with challenges in microgrid systems, some aspects are still under research. Meanwhile, grounding architectures impact on power electronic converters needed to investigate more. This research presents the grounding method acts as a high impedance grounding in normal condition to avoid DC stray currents flow, and for fault transients acts as solid grounding. Then ground fault current is limited through a limiter resistor, to the permissible value, resulted in protecting power electronic interfaces.