An Aggregated Model of a Large Wind Farm with Variable-Speed Wind Turbines Equipped with Doubly-Fed Induction Generators

Abstract

One of the main concerns of grid-integration of large wind farms with variable-speed wind turbines equipped with doubly-fed induction generators controlled by back-to-back converters is a possible risk of mutual interaction between the control systems of the converters. This topic is discussed and illustrated by simulations on a large wind farm model consisting of eighty wind turbines, when subjected to a short-circuit fault. At no mutual interaction, the wind turbines show coherent response at the grid fault. In such a case, large wind farms can be represented by one-machine equivalent, e.g. one wind turbine model with re-scaled power capacity. This simplification can be applied for voltage stability investigations carried out on detailed models of large power systems.

Keywords

wind farm wind turbine doubly-fed induction generator back-to-back converter control models

References

Grud

, State of the art offshore wind technology, Workshop Offshore-Windenergienutzung Technik, Naturschutz, Planung, Deutsches Windenergie- Institut GmbH, Wilhelmshafen, Germany, 27 June 2000.

Ackermann

Leutz

Hobohm

, World-wide offshore potential and European projects, Proc Power Engineering Society Summer Meeting, June 2001, Vancouver, Canada, vol. 1, pp. 4–9.

Slootweg

J G

Kling

W L

, Modelling of large wind farms in power system simulations”, Proc IEEE PES Summer Meeting, July 2002, Chicago, USA, 6 pp.

Akhmatov

Knudsen

Nielsen

A H

Poulsen

N K

Pedersen

J K

, Short-term stability of large-scale wind farms, Proc European Wind Energy Conf EWEC, Copenhagen, Denmark, July 2001, Paper PG 3.56.

Akhmatov

Knudsen

Nielsen

A H

Pedersen

J K

Poulsen

N K

, Modelling and transient stability of large wind farms, Electrical Power & Energy Systems, 2003, Vol. 25, Issue 2, pp. 123–144.

Akhmatov

Knudsen

, An aggregate model of a grid-connected, large-scale, offshore wind farm for power stability investigations — importance of windmill mechanical system, Electrical Power & Energy Systems, 2002, Vol. 24, Issue 9, pp. 709–717.

Akhmatov

, Modelling of variable-speed wind turbines with doubly-fed induction generators in short-term stability investigations, 3rd International Workshop on Transmission Networks for Offshore Wind Farms, April 2002, Stockholm, Sweden, 23 p.

Akhmatov

, Variable-speed wind turbines with doubly-fed induction generators. Part III: Model with the back-to-back converters, Wind Engineering, 2003, Vol. 27, Issue 2, pp 79–91.

Ekanayake

J.B.

Holdsworth

X.G.

Jenkins

, Dynamic modelling of doubly fed induction generator wind turbines, IEEE Transactions on Power Systems, 2003, Vol. 18, No. 2, pp. 803–809.

10.

Røstøen

H Ø

Undeland

T M

Gjengedal

, Doubly-fed induction generator in a wind turbine, Proc IEEE/Cigre Workshop Wind Power and the Impacts on Power Systems, June 2002, Oslo, Norway, 6 p.

11.

Pena

R S

Cardenas

R J

Asher

G M

Clare

J C

, Vector controlled induction machines for stand-alone wind energy applications, Conference Record of the 2000 IEEE Industry Applications Conference, Oct. 2000, Vol. 3, pp. 1409–1415.

12.

Akhmatov

, Variable-speed wind turbines with doubly-fed induction generators. Part IV: Not-interrupted operation features at grid faults with converter control co-ordination, submitted to Wind Engineering.

13.

Yamamoto

Motoyoshi

, Active and reactive power control for doubly-fed wound rotor induction generators, IEEE Transactions Power Electronics, 1991, Vol. 6, No. 4, pp. 624–629.

14.

Schauder

Mehta

, Vector analysis and control of advanced static VAR compensators, IEE Proceedings-C, 1999, Vol. 140, No. 4, pp. 299–306.