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Analogy between conventional grid control and Islanded microgrid control based on a global dc-link voltage droop

Tine Vandoorn UGent, Bart Meersman UGent, Jeroen De Kooning UGent and Lieven Vandevelde UGent (2012) IEEE TRANSACTIONS ON POWER DELIVERY. 27(3). p.1405-1414
abstract
For islanded microgrids, droop-based control methods are often used to achieve a reliable energy supply. However, in case of resistive microgrids, these control strategies can be rather different to what conventional grid control is accustomed to. Therefore, in this paper, the theoretical analogy between conventional grid control by means of synchronous generators (SGs) and the control of converter-interfaced distributed generation (CIDG) units in microgrids is studied. The conventional grid control is based on the frequency as a global parameter showing differences between mechanical power and ac power. The SGs act on changes of frequency through their P/f droop controller, without interunit communication. For CIDG units, a difference between dc-side power and ac-side power is visible in the dc-link voltage of each unit. Opposed to grid frequency, this is not a global parameter. Thus, in order to make a theoretical analogy, a global measure of the dc-link voltages is required. A control strategy based on this global voltage is presented and the analogy with the conventional grid control is studied, with the emphasis on the need for interunit communication to achieve this analogy. A known control strategy in resistive microgrids, called the voltage-based droop control for CIDG units, approximates this analogy closely, but avoids interunit communication. Therefore, this control strategy is straightforward for implementation since it is close to what control engineers are used to. Also, it has some specific advantages for the integration of renewables in the network.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
PARALLEL INVERTERS, SUPPLY-SYSTEMS, LOAD-SHARING CONTROL, DISTRIBUTED-GENERATION INVERTERS, POWER-SYSTEMS, IMPEDANCE, OPERATION, MANAGEMENT, DESIGN, Conventional grid control, distributed generation, droop control, microgrid, voltage-source inverter
journal title
IEEE TRANSACTIONS ON POWER DELIVERY
IEEE Trans. Power Deliv.
volume
27
issue
3
pages
1405 - 1414
Web of Science type
Article
Web of Science id
000305751400043
JCR category
ENGINEERING, ELECTRICAL & ELECTRONIC
JCR impact factor
1.519 (2012)
JCR rank
83/242 (2012)
JCR quartile
2 (2012)
ISSN
0885-8977
DOI
10.1109/TPWRD.2012.2193904
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2079142
handle
http://hdl.handle.net/1854/LU-2079142
date created
2012-04-02 13:15:46
date last changed
2012-10-29 10:56:12
@article{2079142,
  abstract     = {For islanded microgrids, droop-based control methods are often used to achieve a reliable energy supply. However, in case of resistive microgrids, these control strategies can be rather different to what conventional grid control is accustomed to. Therefore, in this paper, the theoretical analogy between conventional grid control by means of synchronous generators (SGs) and the control of converter-interfaced distributed generation (CIDG) units in microgrids is studied. The conventional grid control is based on the frequency as a global parameter showing differences between mechanical power and ac power. The SGs act on changes of frequency through their P/f droop controller, without interunit communication. For CIDG units, a difference between dc-side power and ac-side power is visible in the dc-link voltage of each unit. Opposed to grid frequency, this is not a global parameter. Thus, in order to make a theoretical analogy, a global measure of the dc-link voltages is required. A control strategy based on this global voltage is presented and the analogy with the conventional grid control is studied, with the emphasis on the need for interunit communication to achieve this analogy. A known control strategy in resistive microgrids, called the voltage-based droop control for CIDG units, approximates this analogy closely, but avoids interunit communication. Therefore, this control strategy is straightforward for implementation since it is close to what control engineers are used to. Also, it has some specific advantages for the integration of renewables in the network.},
  author       = {Vandoorn, Tine and Meersman, Bart and De Kooning, Jeroen and Vandevelde, Lieven},
  issn         = {0885-8977},
  journal      = {IEEE TRANSACTIONS ON POWER DELIVERY},
  keyword      = {PARALLEL INVERTERS,SUPPLY-SYSTEMS,LOAD-SHARING CONTROL,DISTRIBUTED-GENERATION INVERTERS,POWER-SYSTEMS,IMPEDANCE,OPERATION,MANAGEMENT,DESIGN,Conventional grid control,distributed generation,droop control,microgrid,voltage-source inverter},
  language     = {eng},
  number       = {3},
  pages        = {1405--1414},
  title        = {Analogy between conventional grid control and Islanded microgrid control based on a global dc-link voltage droop},
  url          = {http://dx.doi.org/10.1109/TPWRD.2012.2193904},
  volume       = {27},
  year         = {2012},
}

Chicago
Vandoorn, Tine, Bart Meersman, Jeroen De Kooning, and Lieven Vandevelde. 2012. “Analogy Between Conventional Grid Control and Islanded Microgrid Control Based on a Global Dc-link Voltage Droop.” Ieee Transactions on Power Delivery 27 (3): 1405–1414.
APA
Vandoorn, T., Meersman, B., De Kooning, J., & Vandevelde, L. (2012). Analogy between conventional grid control and Islanded microgrid control based on a global dc-link voltage droop. IEEE TRANSACTIONS ON POWER DELIVERY, 27(3), 1405–1414.
Vancouver
1.
Vandoorn T, Meersman B, De Kooning J, Vandevelde L. Analogy between conventional grid control and Islanded microgrid control based on a global dc-link voltage droop. IEEE TRANSACTIONS ON POWER DELIVERY. 2012;27(3):1405–14.
MLA
Vandoorn, Tine, Bart Meersman, Jeroen De Kooning, et al. “Analogy Between Conventional Grid Control and Islanded Microgrid Control Based on a Global Dc-link Voltage Droop.” IEEE TRANSACTIONS ON POWER DELIVERY 27.3 (2012): 1405–1414. Print.