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

Namhun Cho, Myungseok Yoon and Sungyun Choi ()
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Namhun Cho: Korea Electric Power Research Institute, Daejeon 34056, Korea
Myungseok Yoon: School of Electric Engineering, Korea University, Seoul 02841, Korea
Sungyun Choi: School of Electric Engineering, Korea University, Seoul 02841, Korea

Sustainability, 2022, vol. 14, issue 15, 1-23

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

Keywords: distributed energy resource; fault current; interconnection transformer; inverter-based distributed generation; short-circuit analysis; transformer topology (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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