Output Impedance Measurement of Digitally Controlled Power Converters in LVDC-Grids

Due to the increase in possible sector couplings to local low voltage DC grids, the amount of controlled infeed converters connected to the grids increases. For these grids to remain stable, proper system analysis is required. While simulation of these systems is possible, the final setup requires m...

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Bibliographic Details
Published in2024 IEEE Sixth International Conference on DC Microgrids (ICDCM) pp. 1 - 8
Main Authors Schwanninger, Raffael, Schmitt, Daniel, Lavery, Melanie, Wunder, Bernd, Maerz, Martin
Format Conference Proceeding
LanguageEnglish
Published IEEE 05.08.2024
Subjects
Bandwidth
control
Couplings
DC grids
Digital control
Impedance measurement
Low voltage
Microgrids
Power measurement
PRBS
simulation
stability
system analysis
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Summary:Due to the increase in possible sector couplings to local low voltage DC grids, the amount of controlled infeed converters connected to the grids increases. For these grids to remain stable, proper system analysis is required. While simulation of these systems is possible, the final setup requires measurements. In this paper, the problem of output impedance measurement of digitally controlled power converters, which make up the majority of infeed converters in medium to high power LVDC grids, is discussed. Digital control leads to several requirements regarding the test signals used to measure the converters. Due to the nonlinearity of certain power converter types, the measurements required for a full description of the power converter typically need to be taken for a variety of loads and grid voltages. Wide bandwidth measurements can be used to reduce the overall measurement time. These wide bandwidth measurements require further investigation regarding signal amplitude, which is presented in this paper.
DOI:10.1109/ICDCM60322.2024.10664837