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Converter impedance characterization for stability analysis of low-voltage DC-grids

: Rykov, K.; Duarte, J.L.; Szpek, M.; Olsson, J.; Zeltner, S.; Ott, L.


Institute of Electrical and Electronics Engineers -IEEE-; Institute of Electrical and Electronics Engineers -IEEE-, Power & Energy Society -PES-:
IEEE PES Innovative Smart Grid Technologies Conference, ISGT 2014 : Washington, DC, USA, 19 - 22 February 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-3654-0
ISBN: 978-1-4799-3653-3
ISBN: 978-1-4799-3652-6
Innovative Smart Grid Technologies Conference (ISGT) <2014, Washington/DC>
Conference Paper
Fraunhofer IISB ()

The paper discusses aspects of modelling and operation of low-voltage DC-grids with aggregated power and load modules in terms of small-signal stability. Multiple power modules connected to the common DC-bus potentially may become a reason of voltage instabilities due to background harmonics interactions. Unfortunately, in a practical grid implementation, usually the internal structure of the converters including control algorithms and parameters is not fully known for the users. A technique of experimental impedance identification, applied to each module and which consequently enables for the relatively simple and effective analysis of the aggregated system, is described.