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Improving performance of droop-controlled microgrids through distributed PI-control

Tegling, Emma LU ; Andreasson, Martin ; Simpson-Porco, John W. and Sandberg, Henrik LU (2016) 2016 American Control Conference, ACC 2016 In Proceedings of the American Control Conference 2016-July. p.2321-2327
Abstract

This paper investigates transient performance of inverter-based microgrids in terms of the resistive power losses incurred in regulating frequency under persistent stochastic disturbances. We model the inverters as second-order oscillators and compare two algorithms for frequency regulation: the standard frequency droop controller and a distributed proportional-integral (PI) controller. The transient power losses can be quantified using an input-output H2 norm. We show that the distributed PI-controller, which has previously been proposed for secondary frequency control (the elimination of static errors), also has the potential to significantly improve performance by reducing transient power losses. This loss reduction is shown to be... (More)

This paper investigates transient performance of inverter-based microgrids in terms of the resistive power losses incurred in regulating frequency under persistent stochastic disturbances. We model the inverters as second-order oscillators and compare two algorithms for frequency regulation: the standard frequency droop controller and a distributed proportional-integral (PI) controller. The transient power losses can be quantified using an input-output H2 norm. We show that the distributed PI-controller, which has previously been proposed for secondary frequency control (the elimination of static errors), also has the potential to significantly improve performance by reducing transient power losses. This loss reduction is shown to be larger in a loosely interconnected network than in a highly interconnected one, whereas losses do not depend on connectivity if standard droop control is employed. Moreover, our results indicate that there is an optimal tuning of the distributed PI-controller for loss reduction. Overall, our results provide an additional argument in favor of distributed algorithms for secondary frequency control in microgrids.

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Please use this url to cite or link to this publication:
author
; ; and
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
2016 American Control Conference, ACC 2016
series title
Proceedings of the American Control Conference
volume
2016-July
article number
7525264
pages
7 pages
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
conference name
2016 American Control Conference, ACC 2016
conference location
Boston, United States
conference dates
2016-07-06 - 2016-07-08
external identifiers
  • scopus:84992128617
ISSN
0743-1619
ISBN
9781467386821
DOI
10.1109/ACC.2016.7525264
language
English
LU publication?
no
additional info
Publisher Copyright: © 2016 American Automatic Control Council (AACC).
id
5c901cf9-f4ca-4a1c-aa17-5b7bb4b3ccc9
date added to LUP
2021-11-24 09:56:59
date last changed
2022-04-27 06:11:12
@inproceedings{5c901cf9-f4ca-4a1c-aa17-5b7bb4b3ccc9,
  abstract     = {{<p>This paper investigates transient performance of inverter-based microgrids in terms of the resistive power losses incurred in regulating frequency under persistent stochastic disturbances. We model the inverters as second-order oscillators and compare two algorithms for frequency regulation: the standard frequency droop controller and a distributed proportional-integral (PI) controller. The transient power losses can be quantified using an input-output H2 norm. We show that the distributed PI-controller, which has previously been proposed for secondary frequency control (the elimination of static errors), also has the potential to significantly improve performance by reducing transient power losses. This loss reduction is shown to be larger in a loosely interconnected network than in a highly interconnected one, whereas losses do not depend on connectivity if standard droop control is employed. Moreover, our results indicate that there is an optimal tuning of the distributed PI-controller for loss reduction. Overall, our results provide an additional argument in favor of distributed algorithms for secondary frequency control in microgrids.</p>}},
  author       = {{Tegling, Emma and Andreasson, Martin and Simpson-Porco, John W. and Sandberg, Henrik}},
  booktitle    = {{2016 American Control Conference, ACC 2016}},
  isbn         = {{9781467386821}},
  issn         = {{0743-1619}},
  language     = {{eng}},
  month        = {{07}},
  pages        = {{2321--2327}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  series       = {{Proceedings of the American Control Conference}},
  title        = {{Improving performance of droop-controlled microgrids through distributed PI-control}},
  url          = {{http://dx.doi.org/10.1109/ACC.2016.7525264}},
  doi          = {{10.1109/ACC.2016.7525264}},
  volume       = {{2016-July}},
  year         = {{2016}},
}