Capability constraints to mitigate voltage fluctuations from DFIG wind farms when delivering ancillary services to the network

Meegahapola, L and Perera, S 2014, 'Capability constraints to mitigate voltage fluctuations from DFIG wind farms when delivering ancillary services to the network', International Journal of Electrical Power and Energy Systems, vol. 62, pp. 152-162.


Document type: Journal Article
Collection: Journal Articles

Title Capability constraints to mitigate voltage fluctuations from DFIG wind farms when delivering ancillary services to the network
Author(s) Meegahapola, L
Perera, S
Year 2014
Journal name International Journal of Electrical Power and Energy Systems
Volume number 62
Start page 152
End page 162
Total pages 11
Publisher Elsevier
Abstract Majority of the wind power resources are typically sited at remote locations in power networks and generated power is transmitted through rural transmission corridors to load centres. With increased penetration level of the wind generation there is an increased requirement to provide ancillary services from distributed wind power resources, hence they are operated under different control strategies to provide ancillary services to the network. The control strategies and capability characteristics will significant impact on voltage fluctuations in distribution networks. This paper presents a comparative analysis between different wind generator control strategies (i.e. power factor control strategy, voltage control strategy and reactive power dispatch strategy) on network voltage fluctuations during variable wind conditions while considering extended reactive power capability (i.e. with both generator and power electronic converter reactive power capabilities) for the doubly-fed induction generator (DFIG). Voltage fluctuations are analysed using real wind data measured at a DFIG based wind farm, and the wind farm model was verified against real measurements. Study has shown that voltage fluctuations are exacerbated when wind generator is at mode transition (i.e. from power optimisation mode to power limitation mode). A sensitivity analysis has shown that voltage fluctuations are exacerbated due to the limitations of the reactive power capability of the DFIG, and the operating point of the DFIG power curve irrespective of the control strategy implemented at the wind generator. Furthermore, a mitigation strategy was developed as an integrated control scheme to the main control scheme in order to reduce voltage fluctuations due to wind power variations. However, effectiveness of the mitigation strategy is greatly affected by the reactive power capability of the DFIG, in particular during high wind turbulences.
Subject Electrical and Electronic Engineering not elsewhere classified
Keyword(s) Capability chart
Doubly-fed induction generator (DFIG)
Flicker emission
Flicker mitigation
Power factor control
Voltage control
DOI - identifier 10.1016/j.ijepes.2014.04.032
Copyright notice © 2014 Elsevier Ltd. All rights reserved.
ISSN 0142-0615
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Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 7 times in Scopus Article | Citations
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