scholarly journals An investigation on the impacts of passive and semiactive structural control on a fixed bottom and a floating offshore wind turbine

Wind Energy ◽  
2019 ◽  
Vol 22 (11) ◽  
pp. 1451-1471 ◽  
Author(s):  
Semyung Park ◽  
Matthew A. Lackner ◽  
Pariya Pourazarm ◽  
Arturo Rodríguez Tsouroukdissian ◽  
John Cross‐Whiter
Keyword(s):  
Wind Turbine ◽  
Structural Control ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Floating Offshore Wind Turbine

Structural Control of an Ultra-Large Semi-Submersible Floating Offshore Wind Turbine

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Zhixin Zhao ◽  
Wenhua Wang ◽  
Dongdong Han ◽  
Wei Shi ◽  
Yulin Si ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Dynamic Model ◽  
Structural Control ◽  
Degrees Of Freedom ◽  
Vibration Suppression ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Floating Platform ◽  
Floating Offshore Wind Turbine ◽  
Proposed Model

Abstract A braceless semi-submersible floating platform is proposed for a Technical University of Denmark (DTU) 10-MW wind turbine at moderate water depths with reference to an existing National Renewable Energy Laboratory (NREL) 5-MW braceless semi-submersible floating platform, and a servo control system for a 10-MW semi-submersible floating offshore wind turbine (FOWT) is introduced. To control the ultimate and fatigue loads of the FOWT, a fore-aft tuned mass damper (TMD) installed in the nacelle of the 10-MW semi-submersible FOWT was investigated for vibration alleviation and load reduction. Considering the hydrodynamic and mooring effect, a four degrees-of-freedom (DOFs) (platform surge and pitch motions, tower fore-aft bending, and TMD translation) simplified dynamic model for the 10-MW semi-submersible FOWT is established based on D’Alembert’s principle. Then, the parameter estimation is conducted based on the Levenberg–Marquardt (LM) algorithm, and the simplified dynamic model was further verified by comparing the output responses with FAST and the proposed model. Furthermore, the exhaustive search (ES) and genetic algorithm (GA) are embedded into the simplified dynamic model to optimize the TMD parameters. Finally, a fully coupled time-domain simulation for all the selected environmental conditions is conducted in FAST, and the vibration suppression performance of the optimized TMD design for the 10-W semi-submersible FOWT was further examined and analyzed.

Structural Control of the Ultra-Large Semi-Submersible Floating Offshore Wind Turbine

2020 ◽  
Author(s):  
Xin Li ◽  
Zhixin Zhao ◽  
Dongdong Han ◽  
Haisheng Zhao
Keyword(s):  
Wind Turbine ◽  
Structural Control ◽  
Degrees Of Freedom ◽  
Offshore Wind ◽  
Simplified Model ◽  
Offshore Wind Turbine ◽  
Unknown Parameters ◽  
Floating Offshore Wind Turbine ◽  
Lm Algorithm ◽  
Fully Coupled

Abstract Taking the DTU 10 MW braceless semi-submersible floating offshore wind turbine (FOWT) as the research object, an ideal tuned mass damper (TMD) installed in platform of the 10 MW semi-submersible FOWT is investigated to dynamically compensate the vibrations and reduce the structural loads. Considering the hydrodynamic and mooring effects, a simplified model of FOWT with four degrees of freedom (DOFs) including platform surge, pitch, tower fore-aft bending and TMD translation is established according to the D’Alembert’s principle. Then, based on the Levenberg-Marquardt (LM) algorithm, the unknown parameters related to the simplified model are estimated. Compared with results from FAST-SC, the simplified dynamic model is validated. Furthermore, the response surface method and genetic algorithm (GA) are used to determine the optimized TMD parameter. Finally, the fully coupled time-domain simulation of the FOWT with active TMD subjected to environmental loadings is conducted by using FAST-SC, and the effect of the TMD on the load reduction of the 10 MW braceless semi-submersible FOWT is analyzed. The study provides a feasible method for the structural control of the ultra-large semi-submersible FOWTs.

scholarly journals Resonance Avoidance Control Algorithm for Semi-Submersible Floating Offshore Wind Turbine

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4138
Author(s):  
Kwansu Kim ◽  
Hyunjong Kim ◽  
Hyungyu Kim ◽  
Jaehoon Son ◽  
Jungtae Kim ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Control Algorithm ◽  
Torque Control ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Resonance Problem ◽  
Exclusion Zone ◽  
Mean Power ◽  
Floating Offshore Wind Turbine ◽  
Avoidance Control

In this study, a resonance avoidance control algorithm was designed to address the tower resonance problem of a semi-submersible floating offshore wind turbine (FOWT) and the dynamic performance of the wind turbine, floater platform, and mooring lines at two exclusion zone ranges were evaluated. The simulations were performed using Bladed, a commercial software for wind turbine analysis. The length of simulation for the analysis of the dynamic response of the six degrees of freedom (DoF) motion of the floater platform under a specific load case was 3600 s. The simulation results are presented in terms of the time domain, frequency domain, and using statistical analysis. As a result of applying the resonance avoidance control algorithm, when the exclusion zone range was ±0.5 rpm from the resonance rpm, the overall performance of the wind turbine was negatively affected, and when the range was sufficiently wide at ±1 rpm, the mean power was reduced by 0.04%, and the damage equivalent load of the tower base side–side bending moment was reduced by 14.02%. The tower resonance problem of the FOWT caused by practical limitations in design and cost issues can be resolved by changing the torque control algorithm.

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