Parameterized Disturbance Observer Based Controller to Reduce Cyclic Loads of Wind Turbine

Imran, Raja Muhammad; Hussain, Dil Muhammad Akbar; Chowdhry, Bhawani Shankar

doi:10.3390/en11051296

Cited by 10 publications

(9 citation statements)

References 27 publications

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“…Disturbance accommodating-based control was also used in [28] to regulate rotor speed at above-rated wind speeds, mitigating at the same time cyclic blade root loads. Similarly, a parameterized disturbance observer-based controller with an individual pitch control strategy was designed in [29] to reduce cyclic loads generated due to wind shear and tower shadow effects. The proposed controller was able to reduce "output power fluctuation, tower oscillation and drive-train torsion" [29].…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, a parameterized disturbance observer-based controller with an individual pitch control strategy was designed in [29] to reduce cyclic loads generated due to wind shear and tower shadow effects. The proposed controller was able to reduce "output power fluctuation, tower oscillation and drive-train torsion" [29]. An approach to estimate the fatigue loads based on the reconstruction of data series of the stochastic properties measured at wind turbines was discussed in [30,31].…”

Section: Introductionmentioning

confidence: 99%

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Reduction of Structural Loads in Wind Turbines Based on an Adapted Control Strategy Concerning Online Fatigue Damage Evaluation Models

2018

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In recent years, the rapidly-increasing demand for energy generation from renewable resources has been noticeable. Additional requirements are consequently set on Wind Turbine (WT) systems, primarily reflected in WT size and power rating increases. With the size increase of WT, structural loads/fatigue stress on the wind turbine become larger, simultaneously leading to its accelerated aging and the shortening of its lifetime. The primary goal of this contribution is to establish an approach for structural load reduction while retaining or slightly sacrificing the power production requirements. The approach/control strategy includes knowledge about current fatigue damage and/or damage increments and consists of multi-input multi-output controllers with variable control parameters. By the appropriate selection of the designed Multi-Input Multi-Output (MIMO) controllers, the mitigation of structural loads in accordance with a predefined range of accumulated fatigue damage or damage increments, exactly to the extent required to provide a predefined service lifetime, is obtained. The validation of the aforementioned control strategy is based on the simulation results and the WT model developed by National Renewable Energy Laboratory (NREL). The obtained results prove the efficiency of the proposed control strategy with respect to the reduction of rotor blade bending moments, simultaneously exhibiting no significant impact on the resulting power generation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reduction of Structural Loads in Wind Turbines Based on an Adapted Control Strategy Concerning Online Fatigue Damage Evaluation Models

2018

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“…One of the inputs to the testbed is the wind speed profile. At first, the wind speed is set to 10 m/s, which is below the rated wind speed (11.4 m/s) for 60 s. After that, the wind speed increases abruptly to 12 and 14 m/s at 60 and 90 s, respectively, to activate the pitch control mode [23]. After 300 s, the wind speed is rapidly decreased to 12 m/s.…”

Section: Test Resultsmentioning

confidence: 99%

Development of Hardware-in-the-Loop-Simulation Testbed for Pitch Control System Performance Test

et al. 2019

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This paper deals with the development of a wind turbine pitch control system and the construction of a Hardware-in-the-Loop-Simulation (HILS) testbed for the performance test of the pitch control system. When the wind speed exceeds the rated wind speed, the wind turbine pitch controller adjusts the blade pitch angles collectively to ensure that the rotor speed maintains the rated rotor speed. The pitch controller with the individual pitch control function can add individual pitch angles into the collective pitch angles to reduce the mechanical load applied to the blade periodically due to wind shear. Large wind turbines often experience mechanical loads caused by wind shear phenomena. To verify the performance of the pitch control system before applying it to an actual wind turbine, the pitch control system is tested on the HILS testbed, which acts like an actual wind turbine system. The testbed for evaluating the developed pitch control system consists of the pitch control system, a real-time unit for simulating the wind and the operations of the wind turbine, an operational computer with a human–machine interface, a load system for simulating the actual wind load applied to each blade, and a real pitch bearing. Through the several tests based on HILS test bed, how well the pitch controller performed the given roles for each area in the entire wind speed area from cut-in to cut-out wind speed can be shown.

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“…where ρ is the air density, r v represents the effective wind speed on the turbine rotor [30], R is the rotor radius of VSWT, r w is the VSWT rotor angular speed, ( ( , ), ) p r r C λ v w β is the aerodynamic power coefficient, and β is the blade pitch angle. The tip speed ratio λ is defined as [30]:…”

Section: Rotor Aerodynamicsmentioning

confidence: 99%

“…y. Thus, the effective (relative) wind speed v r on the turbine rotor can be expressed with the normal wind speed w and the tower deflection as follows [30]:…”

Section: Tower Dynamicsmentioning

confidence: 99%

Wind Turbine Control Using Nonlinear Economic Model Predictive Control over All Operating Regions

Kong

Liu

et al. 2020

Energies

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With the gradual increase in the installed capacity of wind turbines, more and more attention has been paid to the economy of wind power. Economic model-predictive control (EMPC) has been developed as an effective advanced control strategy, which can improve the dynamic economy performance of the system. However, the variable-speed wind turbine (VSWT) system widely used is generally nonlinear and highly coupled nonaffine systems, containing multiple economic terms. Therefore, a nonlinear EMPC strategy considering power maximization and mechanical load minimization is proposed based on the comprehensive VSWT model, including the dynamics of the tower and the gearbox in this paper. Three groups of simulations verify the effectiveness and reliability/practicability of the proposed nonlinear EMPC strategy.

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Parameterized Disturbance Observer Based Controller to Reduce Cyclic Loads of Wind Turbine

Cited by 10 publications

References 27 publications

Reduction of Structural Loads in Wind Turbines Based on an Adapted Control Strategy Concerning Online Fatigue Damage Evaluation Models

Reduction of Structural Loads in Wind Turbines Based on an Adapted Control Strategy Concerning Online Fatigue Damage Evaluation Models

Development of Hardware-in-the-Loop-Simulation Testbed for Pitch Control System Performance Test

Wind Turbine Control Using Nonlinear Economic Model Predictive Control over All Operating Regions

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