Research on individual pitch control below rated wind speed

Abstract

The structure of the modern wind turbine is becoming larger and more complex, with the wind rotor exceeding hundreds of meters in diameter. The blade shear force is also becoming increasingly serious below the rated wind speed, which leads to structure fatigue loads and instability of the generator power. For improving the dynamic performance of large wind turbines, it was proposed that individual pitch control (IPC) method was operated below the rated wind speed. In this paper, we analyze the relationship between the aerodynamic characteristics of blades and the nonlinear time-varying pitch control system based on wind shear and the tower shadow effect. The combination of IPC and torque control is used to optimize the control mode of the wind turbine. By fine-tuning the pitch angle, the unbalanced force on the wind rotor was relieved to achieve the purpose of mitigating fatigue loads. Finally, our experimental results prove the validity of the proposed IPC method below the rated wind speed by showing that it can improve power quality and reduce fatigue loads of the key components without reducing the generator output power.

Study of Tower Clearance Safety Protection during Extreme Gust Based on Wind Turbine Monitoring Data

“…In order to control the adverse impact of extreme gust on tower clearance during the operation of large-scale wind turbine, researchers have also completed numerous studies. Applying a novel fine pitch strategy that varies the fine pitch setting according to the shaft power does not only increase the tower clearance during extreme gust but also reduces fatigue loads [8,9]. This method is actually a kind of power de-rating strategy; thus, its disadvantage is that it will also reduce the power generation of wind turbines under normal operating conditions.…”

LIDAR‐assisted radial basis function neural network optimization for wind turbines

“…Inadequate energy sources and serious environmental pollution are restricting our lives and economic development, which drive the research on green energy technology [1,2]. Wind energy has been of increasing interest among green energies due to the high energy efficiency and lower power costs.…”