Investigation of Technologies and Parameters Influencing the Short-Circuit Current Level of Low-Voltage Distribution Networks

Conference: NEIS 2018 - Conference on Sustainable Energy Supply and Energy Storage Systems
09/20/2018 - 09/21/2018 at Hamburg, Deutschland

Proceedings: NEIS 2018

Pages: 8Language: englishTyp: PDF

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Grumm, Florian; Plenz, Maik; Meyer, Marc Florian; Schulz, Detlef (Electrical Power Systems, Helmut-Schmidt-University, Hamburg, Germany)
Lehmann, Kathrin (BTU Cottbus-Senftenberg, Germany)

This contribution investigates the influence of technologies and parameters influencing the short-circuit level of low-voltage distribution networks. The focus is on the conditions at the low-voltage bus bar of the distribution substation. Four aspects are analyzed: the influence of upstream networks, the influence of voltage regulating distribution trans-formers, the influence of distributed power generation, and the influence of network operations scenarios. For each aspect a different investigation method is used. An equivalent circuit including impedance variation due to the tap-position of the voltage distribution transformer is developed and compared to measurement results. Case studies of referential networks are done to evaluate the influence of distributed generation. Finally, to investigate the network operations scenarios a case study of an actual occurred islanding grid in Germany is used.