Weighted Bandwidth Method for Stability Assessment of Complex DC Power Systems on Ships

Daniele Bosich, Giovanni Giadrossi, Stefano Pastore and Giorgio Sulligoi
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Daniele Bosich: Department of Engineering and Architecture, University of Trieste, 34127 Trieste, Italy
Giovanni Giadrossi: Department of Engineering and Architecture, University of Trieste, 34127 Trieste, Italy
Stefano Pastore: Department of Engineering and Architecture, University of Trieste, 34127 Trieste, Italy
Giorgio Sulligoi: Department of Engineering and Architecture, University of Trieste, 34127 Trieste, Italy

Energies, 2021, vol. 15, issue 1, 1-18

Abstract: In shipboard DC grids, tightly controlled load converters can impair the system stability, thus provoking the ship blackout. Conversely, load converters regulated by low control bandwidths are capable of inducing a stabilizing action. This compensation is verifiable if the loads are few. On the contrary, the balancing of control dynamics is hardly evaluated if the bus feeds multiple (i.e., hundreds or more) DC controlled loads. In this paper, the weighted bandwidth method (WBM) is presented to assess the small-signal stability of a complex shipboard power system by aggregating the multiple converters into two sets of controlled loads. Once the validity of the aggregation is proven, a stability study is performed on the two-loads system. As the last system is more inclined to instability than the initial multiple-loads system, the verification of the two-loads stability criterion guarantees that the shipboard DC grid also remains stable. Finally, emulations on HIL verify the proposed stability assessment thus providing the first unique verification of WBM.

Keywords: DC power system; LC filter; DC-DC power converter; control bandwidth; aggregated loads; stability; HIL (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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