Improving performance of droop-controlled microgrids through distributed PI-control
(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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- author
- Tegling, Emma LU ; Andreasson, Martin ; Simpson-Porco, John W. and Sandberg, Henrik LU
- publishing date
- 2016-07-28
- 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}}, }