Abstract
In recent, DC-based power system is being paid attention as the solution for improving the energy efficiency as distributed generations based on renewable energy and digital devices increase. The interest is gradually extended to Low Voltage DC (LVDC) distribution system. To establish the standards for LVDC distribution system, the studies on various aspects based on the comparative analysis between AC system and DC system have conducted. Protection schemes for LVDC distribution system are also included, but most researches have focused on transient characteristics under DC faults so far. This paper, therefore, analyzes the transient characteristics in LVDC distribution system resulted from the operation of protective device by AC fault. Furthermore, it is proposed the considerations to construct the reliable protection schemes. For this purpose, theoretical analysis with the equivalent circuits of LVDC distribution system is performed, and then the analysis results are verified through simulations with ElectroMagnetic Transients Program.
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