Reactive power sharing improvement of droop-controlled DFIG wind turbines in a microgrid
- Author(s): Mohammad Saleh Marhaba 1 ; Shahrokh Farhangi 1 ; Hossein Iman-Eini 1 ; Reza Iravani 2
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View affiliations
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Affiliations:
1:
The School of Electrical and Computer Engineering, College of Engineering , University of Tehran , Tehran 14395-515 , Iran ;
2: The Department of Electrical and Computer Engineering , University of Toronto , Toronto, ON M5S 3G4 , Canada
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Affiliations:
1:
The School of Electrical and Computer Engineering, College of Engineering , University of Tehran , Tehran 14395-515 , Iran ;
- Source:
Volume 12, Issue 4,
27
February
2018,
p.
842 – 849
DOI: 10.1049/iet-gtd.2016.2086 , Print ISSN 1751-8687, Online ISSN 1751-8695
This study presents an innovative control scheme to improve the power sharing among doubly-fed induction generator (DFIG) wind units in a medium-voltage (MV) microgrid. The control objectives of DFIGs in an islanded mode of microgrid operation are to achieve: (i) stabilisation of the microgrid voltage amplitude and frequency, (ii) proper active/reactive power sharing among wind units. To satisfy these requirements, the DFIG control loop based on the traditional droop control is designed. This method, however, cannot satisfactorily operate in a MV microgrid with dominantly resistive line impedances from power sharing point of view. To overcome this problem, a modified control strategy is proposed in this study. The mathematical modelling is developed, and time-domain simulations are presented to verify the novel control scheme in a typical microgrid case study.
Inspec keywords: machine control; asynchronous generators; distributed power generation; wind turbines; reactive power control; power generation control; voltage control; time-domain analysis; frequency control
Other keywords: microgrid operation; proper active power sharing; modified control strategy; mathematical modelling; proper reactive power sharing; droop-controlled DFIG wind turbines; microgrid voltage frequency stabilisation; doubly-fed induction generator wind units; medium-voltage microgrid; microgrid voltage amplitude stabilisation; innovative control scheme; reactive power sharing improvement; time-domain simulations; islanded mode
Subjects: Asynchronous machines; Voltage control; Wind power plants; Distributed power generation; Mathematical analysis; Control of electric power systems; Power and energy control; Power system control; Mathematical analysis
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