An efficient method for small-signal stability assessment of P - /Q - v droop control in an isolated micro-grid

Mohanraj Bellie Subramani, Srinivas Gude, Kuan Chu Lin, Chia Chi Chu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

An efficient method for small-signal stability assessment of P - /Q - V droop control methods for multiple converters in an isolated micro-grid (MG) is proposed in this paper. A MG model described with arbitrary number of converters is explored first. If there are more number of converters in a chosen MG, only dominant eigenvalues related to droop control are of primary interest. Therefore, constructing a reduced-order model to speed up the small-signal stability assessment becomes necessary. By extending the previous work of MG with P - /Q - V droop control, a reduced-order model of MG with P - /Q - V droop control is investigated under mild assumptions. Such a simplified model will facilitate to compute the poles and zeros of the closed-loop systems and provide more physical insight to examine the relationship between dominant eigenvalues and each droop control gain. As the mathematical analysis of conventional P - /Q - V droop control provides the characteristic polynomials contributed by P - and Q - V droop controls, the P - /Q - V droop control also provides a similar characteristic polynomials contributed by P - and Q - V droop controls. These characteristic polynomials of the system helps MG operators for better tuning of each droop gain for stable operation of MG. A detailed study of actual plant model and the reduced-order plant model are investigated. Both simulation and experimental results are presented to validate the proposed method.

Original languageEnglish
Title of host publicationIEEE Industry Application Society, 52nd Annual Meeting
Subtitle of host publicationIAS 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781467386715
DOIs
StatePublished - 02 11 2016
Externally publishedYes
Event52nd Annual Meeting on IEEE Industry Application Society, IAS 2016 - Portland, United States
Duration: 02 10 201606 10 2016

Publication series

NameIEEE Industry Application Society, 52nd Annual Meeting: IAS 2016

Conference

Conference52nd Annual Meeting on IEEE Industry Application Society, IAS 2016
Country/TerritoryUnited States
CityPortland
Period02/10/1606/10/16

Bibliographical note

Publisher Copyright:
© 2016 IEEE.

Keywords

  • Characteristic Polynomials
  • Droop control
  • Micro-Grid (MG)
  • Power Converters
  • Small-Signal Stability

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