Fault Interruption and Protection Coordination in Converter Interfaced Distribution Systems

Today and future distribution systems have converters connecting various sources and loads to distribution networks. The converters have great impacts on fault protection. Protection of power electronics converters requires fast fault current interruption for protecting semiconductor switches. If fault currents are limited by converters in some cases, the traditional distribution protection based on high fault current and energy may be revised. Protection coordination among fast and slow protective devices of different tripping criteria at different fault conditions should be ensured for selectivity.