A decentralized scalable control architecture for islanded operation of parallel DC/AC inverters with prescribed power sharing

Mayank Baranwal, Alireza Askarian, Srinivasa M. Salapaka

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

Abstract

This paper addresses the problem of output voltage regulation at the point of common coupling (PCC) for multiple single-phase DC/AC inverters connected to a microgrid in islanded mode, and prescribes a robust decentralized scheme for sharing power among different sources. The problem of regulating voltage at PCC is posed as a disturbance-rejection problem, where the load current is regarded as an unknown disturbance signal and thus no assumptions are made regarding the power demanded by the load at the PCC. The disturbance-rejection controller has an inner-outer cascaded structure, where inner-current controller is parameterized by coupling inductance of the inverter, and is such that the inner-loop seen by the outer-voltage controller is identical for all the parallel inverters. This favors scalability by allowing multiple inverters to be added to the PCC without the need to separately design outer-loop controllers for individual inverters. A significant feature of the proposed control architecture is that the stability and performance analysis of the multi-inverter network is tractable; in fact, analysis can be done in terms of an equivalent single-inverter system. Case studies presented in this paper demonstrate the effectiveness of the proposed design in terms of voltage regulation, power sharing and robustness to parametric and modeling uncertainties.

Original languageEnglish (US)
Title of host publication2017 American Control Conference, ACC 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1419-1424
Number of pages6
ISBN (Electronic)9781509059928
DOIs
StatePublished - Jun 29 2017
Event2017 American Control Conference, ACC 2017 - Seattle, United States
Duration: May 24 2017May 26 2017

Publication series

NameProceedings of the American Control Conference
ISSN (Print)0743-1619

Other

Other2017 American Control Conference, ACC 2017
CountryUnited States
CitySeattle
Period5/24/175/26/17

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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