Virtual Impedance Shaping for low voltage Microgrids

Sourav Patel, Soham Chakraborty, Subhrajit Roychowdhury, Murti V. Salapaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


AC Microgrids, in presence of highly non-linear loads, require a tighter regulation of line voltage to maintain power quality. This article proposes an outer virtual impedance loop to shape the output voltage in such microgrids. In order to achieve this, a virtual impedance extracting and shaping filter is first proposed to extract and weigh selected frequency components of the line current. Secondly, design of impedances to weigh the extracted frequency components is obtained in order to achieve harmonic current sharing and reducing total harmonic distortion (THD) even in scenarios of asymmetric sharing of highly non-linear loads. An isochronous voltage-active power half droop architecture is also employed to achieve active, reactive power sharing and to keep circulating currents minimum in the low-voltage microgrid. Analytical results on designing virtual impedances and their dependence on network line parameters are obtained. Finally, MATLAB/SIMULINK-based simulations are performed on a 4.4 kVA microgrid and implemented on a low-cost controller in a controller-hardware-in-the-loop (CHIL) setup to validate the viability of implementation and efficacy of the proposed virtual impedance shaping method.

Original languageEnglish (US)
Title of host publicationAPEC 2020 - 35th Annual IEEE Applied Power Electronics Conference and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages8
ISBN (Electronic)9781728148298
StatePublished - Mar 2020
Event35th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2020 - New Orleans, United States
Duration: Mar 15 2020Mar 19 2020

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC


Conference35th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2020
Country/TerritoryUnited States
CityNew Orleans

Bibliographical note

Funding Information:
ACKNOWLEDGMENT The authors acknowledge Advanced Research Projects Agency-Energy (ARPA-E) NODES for supporting this research through the project titled ”A Robust Distributed Frame-work for Flexible Power Grids” via grant no. DE-AR0000701 and Xcel Energy’s Renewable Development Fund.

Publisher Copyright:
© 2020 IEEE.


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