Large eddy simulation of turbine loading and performance in a wind farm

Highlights

We present an aeroelastic code coupled to an LES solver for wind farm modelling.

Turbine control is included to allow transient above- and below-rated simulation.

Turbine wakes, loads, power fluctuation and control utitlisation are examined.

Wake meandering is observed and found to influence local onset wind directions.

A simulation including yaw control is also presented with significant actuation.

Abstract

We investigate multiple wind turbines operating in a small turbine array using a coupled LES/aero-elastic method. Wake interaction effects are assessed for multiple wind-speeds, with performance of the wind farm quantified, including measurement of efficiency, controller utilisation and loading effects. Power losses are shown to peak at over 40% for the full-wake case, with increased power fluctuation and control actuator usage noted at downwind turbine locations. Spectral analysis of the wake indicates a broad peak meandering frequency. Dynamic yaw control has also been included in the simulations – a first for LES simulation of wind farms – with significant yaw actuation observed due to local wind direction changes despite a constant global wind direction.

Keywords

  • Large eddy simulation;
  • Wind turbines;
  • Actuator methods;
  • Turbine loading;
  • Control

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