| Title |
A Study on Fault Analysis of ±35kV MVDC Hybrid Distribution System Using PSCAD/EMTDC |
| Authors |
강성현(Seong-Hyun Kang) ; 이후동(Hu-Dong Lee) ; 이성두(Seong-Doo Lee) ; 노대석(Dae-Seok Rho) |
| DOI |
https://doi.org/10.5370/KIEE.2021.70.8.1117 |
| Keywords |
±35kV MVDC Hybrid Distribution System; Contingency Fault Analysis; Converter Station; PV system; PSCAD/EMTDC |
| Abstract |
Based on ±35kV-scale MVDC hybrid distribution system to demonstrate MVDC distribution technology, this paper presents scenarios of contingency fault analysis and modeling for impact evaluation on MVDC hybrid distribution system in order to examine the operation characteristics of MVDC facilities and customers. And also, this paper proposes a modeling of the ±35kV-scale MVDC hybrid distribution system using PSCAD/EMTDC, which is composed of distribution substation, MVDC distribution feeder, converter station and PV system. From the simulation results of fault analysis in MVDC distribution system based on the modeling for impact evaluation on distribution system with the fault scenarios, it is confirmed that tremendous fault current can be momentarily occurred due to discharging of DC link capacitor in converter station regardless of fault type. Furthermore, it is found that the faults in MVDC feeder can cause the phenomenon of under-voltage at customers in other feeder of the main transformer. In addition, it is clear that the malfunction of recloser in other feeder can be prevented due to ungrounded system of MVDC system, and also the voltages of AC 22.9kV bus and MVDC feeder are maintained in a stable manner even if ground fault is occurred in AC 22.9kV feeder. |