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Coordinated control of an HVDC link and doubly fed induction generators in a large offshore wind farm.

Xiang, D. W. and Ran, L. and Bumby, J. R. and Tavner, P. J. and Yang, S. C. (2006) 'Coordinated control of an HVDC link and doubly fed induction generators in a large offshore wind farm.', IEEE transactions on power delivery., 21 (1). pp. 463-471.


Doubly fed induction generators (DFIGs) are an economic variable-speed solution for large wind turbines while high-voltage dc (HVdc) transmission is being considered for the grid connection of some offshore wind farms. This paper analyzes the need for coordinating the control of the DFIGs and the HVdc link so that the two topologies can work together, giving system designers and operators a choice that may be useful in some applications. It is desired that individual generators be controlled for power tracking in a way similar to that used when they are connected directly to an ac grid, although a grid voltage reference for the DFIG control is no longer available as an independent source in this case. The study shows that machine control should explicitly maintain the flux level, which then allows the HVdc link to regulate the local system frequency and, indirectly, voltage amplitude. Interactions between DFIGs and the HVdc link are investigated and simulations performed to verify the proposed control strategy.

Item Type:Article
Keywords:Doubly fed induction generator, Frequency, High-voltage dc (HVdc) transmission, Real and reactive power, Voltage, Wind energy, Back PWM converters, Turbines.
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Publisher statement:©2006 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Record Created:27 May 2008
Last Modified:24 May 2011 09:24

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