Analytical Modeling and Experimental Validation of Common Mode Impedance in a Low- Voltage DC Micro-Grid

Currently, electrical networks contain more and more electrical devices interconnected by power, ground, and control cables, which are generally propagation paths of conducted electromagnetic interference (EMI).It is interesting to focus specifically on mode disturbances common.This paper proposes an effective method to recognize low voltage direct current micro-grids (LVDCMG), through common mode impedance identification.For this purpose, a direct current micro-grid (DCMG) can be modeled, it consisted from three converters connected in parallel, including the connectors; the model consists in calculating the common mode impedance of the DCMG.It should be noted that a good knowledge of impedance helps engineers to perform filter optimization, prognostic algorithms, and the protection of electrical installations.The analytical models have been tested by numerical simulation and validated by experimental measurements over a wide frequency range up to 30MHz.