Closed-loop impedance calculation of grid-tied three-phase inverters/rectifiers in bus signaling strategy-controlled DC microgrids

Eggenschwiler, Loïc (School of Engineering and Architecture (HEIA-FR), HES-SO // University of Applied Sciences Western Switzerland) ; Favre-Perrod, Patrick (School of Engineering and Architecture (HEIA-FR), HES-SO // University of Applied Sciences Western Switzerland) ; Adly, M. (Technische Universität Berlin, Berlin, Germany) ; Strunz, Kai (Technische Universität Berlin, Berlin, Germany)

The closed-loop (CL) impedances of each connected microgrid device (generator, sto rage or load) are key elements in stability studies of DC microgrids from the point of view of the DC common bus. The calculation of the CL impedance of standard DC/DC converters is widely described in the literature. The application of this method to a three-phase AC/DC converter connecting DC microgrids to the utility grid, when harmonic filters are required, is studied in this work. Four possible CL impedance types are established, depending on the operation mode of the converter (power flow direction through the interface and on the control applied to the interface at the DC-side), taking the filter into account. To calculate the four possible CL impedances of the three-phase AC/DC interface, a method used in sensitivity analysis is applied. Firstly, three voltage loops are described in the time domain. Secondly, the system is linearized around its operating point and thus the resulting dynamic system can be expressed. Finally, an existing method to close the loop gain is used to take the interface control into account and to determine the resulting CL impedance.


Keywords:
Conference Type:
published full paper
Faculty:
Ingénierie et Architecture
School:
HEIA-FR
Institute:
Energy - Institut de recherche appliquée en systèmes énergétiques
Publisher:
Nuremburg, Germany, 27-29 June 2017
Date:
2017-06
Nuremburg, Germany
27-29 June 2017
Pagination:
7 p.
Published in:
Proceedings of 2017 IEEE Second International Conference on DC Microgrids (ICDCM), 27-29 June 2017, Nuremburg, Germany
DOI:
ISBN:
978-1-5090-4479-5
Appears in Collection:

Note: The status of this file is: restricted


 Record created 2021-05-21, last modified 2021-05-28

Fulltext:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)