| Title |
An Operation Characteristics of Intelligent Protection Coordination Device Considering Fault Current Slope in LVDC System |
| Authors |
김윤호(Yun-Ho Kim) ; 이민행(Min-Haeng Lee) ; 김경화(Kyung-Hwa Kim) ; 장형안(Hyeong-An Jang) ; 최성문(Sung-Moon Choi) ; 노대석(Dae-Seok Rho) |
| DOI |
https://doi.org/10.5370/KIEE.2025.74.4.547 |
| Keywords |
Formulation; Line Constants; Customer Load; Internal Impedance; Control Algorithm; LVDC Distribution System; Slope Characteristics of Fault Current |
| Abstract |
The research on the LVDC distribution system is being conducted as the renewable energy resources and DC load has been rapidly increased. The LVDC distribution system has advantage of utilization of DC energy resources and reduction of power loss, but the research on stable operation and protection coordination methods are being required. In particular, when the fault is occurred in the LVDC distribution system, the interruption may be extended due to shutdown of main converter. Therefore, This paper deals with the formulation of slope characteristics of fault current considering line constants, customer load, internal impedance of section converter and presents the control method to detect and evaluate the fault in accurate manner in intelligent protection coordination device(IPCD). And also, this paper performs the modeling of the IPCD using PSCAD/EMTDC and then implements the IPCD which is composed of H/W power section and S/W control section. From the simulation and test results based on the proposed formulation of fault current, the control method of IPCD is expected to be effective tool because the slope characteristics of PSCAD/EMTDC modeling is nearly equivalent with one of H/W device. And also, it is found that the proposed IPCD with the slope characteristic of fault current can evaluate the fault conditions and limit the fault current in fast and accurate manner compared to the existing method with the magnitude of fault current only. Therefore, it is confirmed that the proposed IPCD can minimize the outage area in LVDC distribution system by preventing the shutdown of main converter. |