Modeling of multi-rotor wind farms

The recurred idea of developing multi-rotor wind turbines has led to the need of more accurate surrogate wake models which allow for a fast annual energy production (AEP) calculation and further understanding of the aerodynamic power losses of multi-rotor wind turbines.<br/><br/>The present thesis develops a surrogate wake model of a multi-rotor...

Analytical solution for the cumulative wake of yawed wind turbines

This thesis sets out to improve the physical grounding and predictive accuracy of cumulative wake effect modelling within wind farms with yawed turbines. It derives an analytical solution for the lateral velocity field within a wind farm and compares its predictions to those of computational fluid dynamics.<br/><br/>A parametric study is...

PIV Experimental Comparison of Vertical Axis Wind Turbine Wake with Theoretical Models

Vertical Axis Wind Turbine (VAWT) operation is characterized by complex and unsteady three-dimensional fluid dynamics, which presents considerable challenges. One of the crucial points to understand is the complex interaction between rotor, inflow, and wake systems. If we can demonstrate its effectiveness in the complex flow/inflow conditions,...

The effects of atmospheric stability on wind farm layout optimization

The power production of downstream wind turbines in a wind farm is significantly impacted by wake effects of upstream turbines. Improving the layout optimization process could reduce these wake losses and therefore result in more efficient wind farms. The wakes are also affected by atmospheric stability conditions, as stable conditions lead to a...

Site-specific validation of turbulence models on large offshore wind farms for improving fatigue assessment

Wind turbines installed in a wind farm are typically subject to increased turbulence because they are in the wake of upstream wind turbines that generate additional turbulence. Accurate prediction of turbulence in wind farms is critical as it is proportional to wind turbine fatigue loads, power losses and prediction of wind farm lifetime. IEC...

Effect of wind speed gradients on AEP in a wind farm cluster

The engineering flow models used to estimate annual energy production (AEP) in offshore wind farm layout optimization typically assume inflow homogeneity over the model domain. This assumption lies in contrast with observations of horizontal wind speed gradients in coastal regions where many offshore wind farms are being constructed. Accounting...

Jensen-Gaussian wake model extension considering the Atmospheric Boundary Layer effects for the Wind Farm Layout Optimization

To increase the total wind farm power output, the wind farm layout needs to be optimized. The power output of a wind turbine depends on the incoming velocity, while the velocity is influenced by the wake of the upstream wind turbines. Wind Farm Layout Optimization (WFLO) problems makes use of the so called low fidelity wake models, which...

The Effect of Wake Models, and Environmental Conditions on Wind Farm Layout Optimization

The purpose of this research is to broaden current knowledge of Wind Farm Layout Optimization (WFLO). Until now, there are many research conducted on different optimization methods, annual energy yield calculation processes, and wake modeling methods. But, few papers have addressed the effect of different modeling parameters on WFLO in a form of...

Design of a Simple Wake Model for the Wind Farm Layout Optimization Considering the Wake Meandering Effect

The design of the optimal layout of the wind farm is crucial to minimize the cost of energy produced by the wind farm. This requires an accurate wake model to simulate the wake effect on the annual energy yield of the wind farm. On the other hand, the wake model must be very simple in order to limit the duration of the layout optimisation...

Development of a design tool for offshore wind farm layout optimization: Consideration of wake effects and electrical infrastructure costs and losses

A design tool has been developed with the aim of helping in the wind farm design process. The tool is able to handle rectangular layouts with any number of turbines. Wind farm power, as well as wind and site conditions can be specified by the user. The main tool models are described and the developing steps have been detailed. Results of tool...