A control-oriented dynamic wind farm flow model

A control-oriented dynamic wind farm flow model: "WFSim"

Boersma, S. (TU Delft Team Raf Van de Plas)
Gebraad, P.M.O. (Siemens Wind Power)
Vali, M. (University of Oldenburg)
Doekemeijer, B.M. (TU Delft Team Raf Van de Plas)
van Wingerden, J.W. (TU Delft Team Raf Van de Plas)

2016

In this paper, we present and extend the dynamic medium fidelity control-oriented Wind Farm Simulator (WFSim) model. WFSim resolves flow fields in wind farms in a horizontal, two dimensional plane. It is based on the spatially and temporally discretised two dimensional Navier-Stokes equations and the continuity equation and solves for a predefined grid and wind farm topology. The force on the flow field generated by turbines is modelled using actuator disk theory. Sparsity in system matrices is exploited in WFSim, which enables a relatively fast flow field computation. The extensions to WFSim we present in this paper are the inclusion of a wake redirection model, a turbulence model and a linearisation of the nonlinear WFSim model equations. The first is important because it allows us to carry out wake redirection control and simulate situations with an inflow that is misaligned with the rotor plane. The wake redirection model is validated against a theoretical wake centreline known from literature. The second extension makes WFSim more realistic because it accounts for wake recovery. The amount of recovery is validated using a high fidelity simulation model Simulator fOr Wind Farm Applications (SOWFA) for a two turbine test case. Finally, a linearisation is important since it allows the application of more standard analysis, observer and control techniques.

http://resolver.tudelft.nl/uuid:87703001-378e-4b5d-8489-31ad9240dd92

https://doi.org/10.1088/1742-6596/753/3/032005

IOP Publishing, Bristol, UK

Journal of Physics - Conference Series: The Science of Making Torque from Wind (TORQUE 2016), 753 ( B. Wind, wakes, turbulence and wind farms)

TORQUE 2016: 6th International Conference "The Science of Making Torque from Wind", 2016-10-05 → 2016-10-07, Technische Universität München (TUM), Campus Garching, Munich, Germany

Journal of Physics - Conference Series, 1742-6588, 753 (B. Wind, wakes, turbulence and wind farms)

Institutional Repository

conference paper

© 2016 S. Boersma, P.M.O. Gebraad, M. Vali, B.M. Doekemeijer, J.W. van Wingerden