| Title |
A DC Fault Current Interruption Method of Inverter |
| DOI |
https://doi.org/10.5370/KIEE.2019.68.8.958 |
| Keywords |
DC fault current; inverter; microgrid; protection; renewable energies |
| Abstract |
Inverter based electrical devices are used for various applications in power system, such as renewable energy based generation, energy storage system (ESS), static compensator (STATCOM), high voltage direct current transmission (HVDC), etc. All of the inverter based devices can interrupt AC fault current much faster than mechanical AC circuit breakers by opening electronic switches, such as insulated gate bipolar transistor (IGBT) and metal oxide semiconductor field effect transistor (MOSFET). By contrast, DC fault current bypasses the electronic switches through anti-parallel diode regardless of the switch states. This paper describes a simple DC fault current interruption topology based on ultrafast disconnectors. The proposed topology can interrupt the DC fault current within at most one cycle. Its performance is verified based on electromagnetic transient (EMT) simulation using power system computer aided design /electromagnetic transients including direct current (PSCADTM/EMTDCTM). |