Impact of Transformer Topology on Short-Circuit Analysis in Distribution Systems with Inverter-Based Distributed Generations

Distributed energy resources (DERs), recently introduced into distribution systems, are mainly inverter-based distributed generations (IBDGs), which have different short-circuit behaviors from conventional synchronous-based (SBDGs). Hence, this study presents a comprehensive analysis of the systems with IBDGs, based on sequence networks and superposition, perspectives interconnected transformers, observes flow zero-sequence fault currents transformer topologies. Moreover, two- three-winding transformers various bank connection types groundings investigated. It was concluded that topology its grounding influence current contribution in networks, high penetration IBDGs alters magnitude phase angles.