Configuration of Protection System for Low Voltage DC Distribution System with Photovoltaic System including Tie Switch

DC power distribution is attracting attention due to the increase in renewable energy and DC load. Due to the characteristics of the DC distribution system configuration such as DC/DC converters, the new protection system are essential for stable operation of the low voltage DC (LVDC) distribution system. This paper proposes a new protection method in the LVDC distribution system with photovoltaic (PV) system connected by tie switch. In the system configuration of the proposed method, circuit breaker(CB)s are installed at both ends of the line. The proposed protection system includes both the fault detection and the recovery procedure. The proposed method is modeled using EMTP/ATPDraw, and the various simulations are performed according to the fault location and fault clearing time.