Power management and power flow control with back-to-back converters in a utility connected microgrid

Majumder, Ritwik, Ghosh, Arindam, Ledwich, Gerard and Zare, Firuz (2010) Power management and power flow control with back-to-back converters in a utility connected microgrid. IEEE Transactions On Power Systems, 25 2: 821-834. doi:10.1109/TPWRS.2009.2034666

Author Majumder, Ritwik
Ghosh, Arindam
Ledwich, Gerard
Zare, Firuz
Title Power management and power flow control with back-to-back converters in a utility connected microgrid
Journal name IEEE Transactions On Power Systems   Check publisher's open access policy
ISSN 0885-8950
Publication date 2010-05-01
Sub-type Article (original research)
DOI 10.1109/TPWRS.2009.2034666
Open Access Status Not yet assessed
Volume 25
Issue 2
Start page 821
End page 834
Total pages 14
Place of publication Piscataway, NJ, United States
Publisher Institute of Electrical and Electronics Engineers
Language eng
Abstract This paper proposes a method for power flow control between utility and microgrid through back-to-back converters, which facilitates desired real and reactive power flow between utility and microgrid. In the proposed control strategy, the system can run in two different modes depending on the power requirement in the microgrid. In mode-1, specified amount of real and reactive power are shared between the utility and the microgrid through the back-to-back converters. Mode-2 is invoked when the power that can be supplied by the distributed generators (DGs) in the microgrid reaches its maximum limit. In such a case, the rest of the power demand of the microgrid has to be supplied by the utility. An arrangement between DGs in the microgrid is proposed to achieve load sharing in both grid connected and islanded modes. The back-to-back converters also provide total frequency isolation between the utility and the microgrid. It is shown that the voltage or frequency fluctuation in the utility side has no impact on voltage or power in microgrid side. Proper relay-breaker operation coordination is proposed during fault along with the blocking of the back-to-back converters for seamless resynchronization. Both impedance and motor type loads are considered to verify the system stability. The impact of dc side voltage fluctuation of the DGs and DG tripping on power sharing is also investigated. The efficacy of the proposed control arrangement has been validated through simulation for various operating conditions. The model of the microgrid power system is simulated in PSCAD.
Keyword Active and reactive power sharing
Back-to-back converters
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Information Technology and Electrical Engineering Publications
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Created: Fri, 12 May 2017, 11:32:43 EST by Firuz Zare on behalf of Learning and Research Services (UQ Library)