The influence of direct current distribution networks on the formation of stray currents

Abstract

In this paper, I focus on the research of the generation or occurrence of stray currents due to the installation of a direct current (DC) distribution system in urban areas. From the technical point of view, the DC distribution systems possess high applicability in smart distribution systems by increasing efficiency and reliability. This is achieved by reducing energy conversions in power systems. Also, the installation of DC systems in residential and commercial buildings in the future is another aspect of integrating distributed generation, smart battery systems and power supply for an increasing number of electrical vehicles. For analysis and simulations of the generation of stray currents in DC distribution systems caused by earth faults, we implemented the programming platform Matlab/Simulink. The simulated cases of DC distribution such as bipolar and unipolar systems are afterwards compared to choose the most reliable DC system in which the generation of stray current is minimized and find out the worst-case scenario for each system. In the end, the DC distribution systems provide a path for the integration of many smart grid techniques and technologies that can improve the efficiency, reliability and economical aspect of the power system. Although it brings some disadvantages such as the formation of stray currents that can cause electrochemical corrosion in metals and infrastructure.