Droopless Active and Reactive Power Sharing in Parallel Operated Inverters in Islanded Microgrids

Alireza Askarian, Mayank Baranwa, Srinivasa M. Salapaka

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


Microgrids have emerged as viable alternatives for supporting the utility grid, reducing feeder losses and improving power quality by enabling integration of growing deployments of distributed energy resources (DERs) with local loads. They can operate in both grid-tied as well as islanded modes. There are two primary objectives in the islanded mode - (a) ensuring system stability by regulating the voltage and frequency at the point-of-common-coupling (PCC), and (b) load power sharing among multiple DERs connected in parallel. While droop based schemes enjoy the advantages of fully decentralized implementation (no communication) and plug-and-play capabilities, such schemes often fail to address the issue of precise active and reactive power sharing, primarily due to unmatched impedances. In this paper, we overcome this limitation by proposing a novel, droopless control scheme for accurate active and reactive power sharing among DERs in an islanded microgrid, while simultaneously regulating output voltage and frequency at the PCC. Similar to droop based schemes, the proposed method too facilitates fully decentralized implementation. This is achieved by smart choice of control design enabled by - (a) disturbance rejection viewpoint, (b) decoupling of d-q control loops through appropriate feedforward blocks, and (c) extension of the network control scheme proposed in our prior work [1]. A system consisting of three parallel inverters is simulated in MATLAB Simscape for various challenging scenarios and the results corroborate the effectiveness of the proposed approach.

Original languageEnglish (US)
Title of host publication2018 IEEE Conference on Decision and Control, CDC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781538613955
StatePublished - Jul 2 2018
Event57th IEEE Conference on Decision and Control, CDC 2018 - Miami, United States
Duration: Dec 17 2018Dec 19 2018

Publication series

NameProceedings of the IEEE Conference on Decision and Control
ISSN (Print)0743-1546
ISSN (Electronic)2576-2370


Conference57th IEEE Conference on Decision and Control, CDC 2018
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Modeling and Simulation
  • Control and Optimization


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