| Title |
Operation Characteristics and Implementation of Fault Current Clamping Device in Radial-type MVDC Distribution System |
| Authors |
한병길(Byeong-Gill Han) ; 이후동(Hu-Dong Lee) ; 태동현(Dong-Hyun Tae) ; 노대석(Dae-Seok Rho) |
| DOI |
https://doi.org/10.5370/KIEE.2021.70.8.1146 |
| Keywords |
MVDC Distribution System; Protection Coordination; Fault Current Clamping Device; Main/Section Converter; Operation Modes |
| Abstract |
When a fault in secondary feeder is occurred in MVDC distribution system, the operation method of protection coordination is required to minimize interruption region in primary feeder, which can operate the protection devices in secondary feeder before the shut-down of the main converter. Therefore, this paper presents fault current clamping devices to limit the fault current in order to prevent shut down of main converter in radial-type MVDC distribution system. The proposed device, which is composed of main path, current clamping path and so on, has functions to rapidly clamp the fault-current within few micro-seconds using semiconductor switches. And also, the proposed device is installed in both main converter and section converter, its operation mechanism is categorized into 4 operation modes such as initial mode, auxiliary mode, main mode and restoration mode. From the simulation results based on modeling of fault current clamping devices using PSCAD/EMTDC, it is confirmed that the proposed fault-current clamping device is a useful tool to isolate fault section by preventing shut-down of main converter and securing operation time for protection devices in secondary feeder |