Abstract
This paper aims to investigate the drivetrain load response caused by induction and wake steering control on two floating wind turbines (FWTs) in a wind farm. In this study, two DTU 10 MW turbines, supported on the nautilus floater, are modelled using FAST.Farm. The downstream turbine is placed at the distance of seven rotor diameters (D) from the upstream turbine in the positive wind direction. Partial wake shading is considered for wake steering control and full wake shading is considered for induction control. An ambient wind speed of 8m/s is used and a representative sea state is selected. The test cases are defined based on different blade pitch and yaw angles of the upstream turbine. Power generation of the offshore wind farm is studied under different test cases. A decouped analysis approach is used to investigate drivetrain response. Global responses are obtained from FAST.Farm. These loads are used as input of the 10 MW wind turbine drivetrain model for the gears and bearings load response analysis. Results show that both induction and wake steering control lead to a limited increase in power generation of the wind farm. Additionally, both control methods affect the drivetrain response statistics, while the features are different. This study facilitates a better understanding on drivetrain dynamic behaviour in a wind farm perspective, which serves as a reference for the wind farm optimizaton in the future.
Highlights
Wind farm control has received significant attention in recent years
This paper aims to investigate the drivetrain load response caused by induction and wake steering control on two floating wind turbines (FWTs) in a wind farm
Effects on power generation The power production, thrust, torque and bending moment of each test case are compared between the two turbines
Summary
Wind turbine wakes, characterized by a velocity deficit and added turbulence, could significantly affect the total power production and fatigue life of turbines within a farm. The velocity deficit behind the upstream turbine results in a power loss of downstream turbines, whereas the added turbulence causes the increase in structural loads of downstream turbines leading to the increase in fatigue damage [1]. Many studies have been conducted to investigate the dynamic behaviour of wakes or wake effects on wind turbines [1]-[3] and some studies have been carried out on the wind farm control [4]-[12], while studies on the load effect analysis of the drivetrains in wind farms have not yet been conducted. Reducing the drivetrain loads and improving its working life should be taken into account when performing wind farm optimization
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