Vereinfachte Kurzschlussstromberechnung für Mittel- und Niederspannungsgleichstromnetze; 1. Auflage [book]

Raphael Bleilevens, Antonello Monti, Albert Moser
2020
Medium- and low-voltage direct current (DC) distribution networks are focus of current research. As in today's three-phase alternating current (AC) networks, currents in DC distribution networks generally cause the greatest stresses for current-carrying equipment in terms of their thermal and mechanical load in case of short circuits. Therefore, the knowledge of possible short-circuit currents in DC distribution systems is absolutely essential for the safe and yet economically appropriate
more » ... y appropriate design of current-carrying equipment. For AC systems, simplified approximation approaches for short-circuit current calculation are available today. In practice, such simplified approximation approaches for the calculation of possible short-circuit currents are desired, since the data requirements and the computation time can be significantly reduced compared to transient calculations. For this reason, a simplified short-circuit current calculation based on an approximation approach is also desirable for DC distribution networks. The aim of this research project is therefore to derive a method for simplified short-circuit current calculation for DC distribution networks. For the simplified short-circuit current calculation, we focus on the calculation approach of superposition of approximated current courses. In this calculation approach, the current courses of all feeding short-circuit current sources are approximated in the first step without taking into account the feedback effects from other short-circuit current sources. Then, the current courses of the individual short-circuit current sources are superposed, taking the DC system into account. Finally, short-circuit current characteristics of the current-carrying equipment are determined. To evaluate the simplified short-circuit current calculation method, a comparison of the calculated short-circuit currents with comparative data is required. Due to the lack of realized DC distribution networks in practice, realistic comparison data is generated by transient calculations i [...]
doi:10.18154/rwth-2020-12198 fatcat:rygy5wy255drdbodoaurj5rjhu