Coupling Analysis for the Design of Industrial DC Microgrids

Society is chasing for a sustainable electric power supply. A successful transition requires efficient conversion of electric power and carbon neutral power generation by renewable sources. Low voltage direct current microgrids (DC MG) provide a solution in both scopes. Often a droop control is used...

Full description

Saved in:
Bibliographic Details
Published in2021 International Conference on Smart Energy Systems and Technologies (SEST) pp. 1 - 6
Main Authors Schaab, Darian Andreas, Knapp, Jonas, Sauer, Alexander
Format Conference Proceeding
LanguageEnglish
Published IEEE 06.09.2021
Subjects
Control design
Couplings
DC microgrids
industrial power systems
Microgrids
Power system stability
Renewable energy sources
Resonant frequency
stability analysis
Stability criteria
Online AccessGet full text

Cover

More Information
Summary:Society is chasing for a sustainable electric power supply. A successful transition requires efficient conversion of electric power and carbon neutral power generation by renewable sources. Low voltage direct current microgrids (DC MG) provide a solution in both scopes. Often a droop control is used as the control strategy for DC microgrids. Droop control is a decentralized strategy to balance power flow of multiple infeed converters. While this approach avoids communication between converters, it results in a strong coupling of all control loops in the grid. The question arises, how to select control parameters of a droop controlled DC MG with respect to coupling of all control loops. This paper investigates on a solution to this topic using direct nyquist array (DNA) design for a droop controlled DC MG. The analysis shows, that there is a high coupling in the low frequency area and in the range of network resonances. Due to some limitations, the Gershgorin method used in this paper is not suitable for controller design in strongly coupled grids. However, the new study shows the influence of various parameters on the coupling of the single control loops in the grid as well as on the stability. The question remains, how to proof stability with respect to interaction at these frequencies.
DOI:10.1109/SEST50973.2021.9543240