Fault Current Limiter Parameter Selection on DC Distribution System Side in MVDC System

Abstract

The MVDC system has many advantages as it can link the renewable distributed power system with the existing AC distribution network, but research on the protection scheme is required because the standard for the DC distribution system has not been established. In general, the energy of a DC power system increases rapidly when a fault occurs. Therefore, it is possible to reduce the stress on the circuit breaker that occurs during interrupting by applying the fault current limiter. However, research on fault current limiter for DC distributed system application have not been conducted, and fault current limiter design considering transient characteristics in MVDC system is required. In this paper, MVDC system was connecting by linking 22.9kV AC power system with ±35kV DC Link. Line-to-line short circuit fault is simulated in ±35kV DC link, fault current is reduced using resistive superconducting fault current limiter(R-SFCL), and fault current is interrupted through Hybrid Circuit Breaker. Accordingly, a short circuit fault was simulated in the ±35kV dc Link, and a protective scheme was proposed that utilizes a fault current limiter to limit the fault current. © The Institution of Engineering & Technology 2023.