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

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

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 interac...

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Bibliographic Details
Published in:ISGT 2014 pp. 1 - 5
Main Authors: Rykov, K., Duarte, J. L., Szpek, M., Olsson, J., Zeltner, S., Ott, L.
Format: Conference Proceeding
Language:English
Published: IEEE 01-02-2014
Subjects:
Analytical models
Impedance
Inverters
Load modeling
Multichip modules
Power system stability
Stability analysis
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Summary: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.
DOI:10.1109/ISGT.2014.6816385