Techno-economic analysis of a hydraulic transmission for floating offshore wind turbines

Roggenburg, Michael; Esquivel-Puentes, Helber Antonio; Vacca, Andrea; Evans, Humberto Bocanegra; Garcia-Bravo, José; Warsinger, David M.; Ivantysynova, Monika; Castillo, Luciano

doi:10.1016/j.renene.2020.02.060

Cited by 21 publications

(14 citation statements)

References 22 publications

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“…Fig. 5 demonstrates the relationship between the reactive power of the generator and the direct component of the rotor and stator current, which is calculated based on (7) and (15). To inject the reactive power to the grid the direct component of the rotor current should be increased further to compensate for the magnetizing current of the generator.…”

Section: Cmentioning

confidence: 99%

“…Then, by using an analytical technique and investigating natural frequencies of the tower for a 5-MW hydraulic wind powertrain, the weight of the tower itself compared with the conventional wind turbine can be cut to 50%, and the capital cost of the wind energy reduced by 4%. The result of [15] demonstrates the reduction of 35.5% in mass of the nacelle due to employing a hydraulic drivetrain and an average installed cost saving of 5.36-24.0% can occur for offshore wind. Despite the lower efficiency of HTS, which is about 85-88% [16,17], the HTS could reduce the overall cost of the system and lower the Levelized Cost of Energy (LCOE) by 3.92-18.8% [15], and improve the Capacity Factor (CF) of the wind turbine [18].…”

Section: Introductionmentioning

confidence: 99%

“…The result of [15] demonstrates the reduction of 35.5% in mass of the nacelle due to employing a hydraulic drivetrain and an average installed cost saving of 5.36-24.0% can occur for offshore wind. Despite the lower efficiency of HTS, which is about 85-88% [16,17], the HTS could reduce the overall cost of the system and lower the Levelized Cost of Energy (LCOE) by 3.92-18.8% [15], and improve the Capacity Factor (CF) of the wind turbine [18]. Given a tower structure, the rotor speed of a wind turbine with HTS could be restricted at a higher speed that results in harvesting about 17% more energy and can compensate for its losses [19].…”

Section: Introductionmentioning

confidence: 99%

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Quasi Self-Excited DFIG-Based Wind Energy Conversion System

Akbari

Izadian

Weissbach

2021

IEEE Trans. on Ind. Applicat.

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This paper introduces a new configuration of the DFIG-based wind energy conversion system (WECS) employing only a reduced-size Rotor Side Converter (RSC) in tandem with a supercapacitor. In the proposed structure, the Grid Side Converter (GSC) utilized in conventional DFIG-based WECSs is successfully eliminated. This is accomplished by employing the hydraulic transmission system (HTS) as a continuously variable and shaft decoupling transmission unit. This transforms the conventional constant-ratio drives by providing an opportunity to control the power flow through the generator's rotor circuit regardless of the wind turbine's shaft speed. This feature of HTS can be utilized to control the RSC power and ultimately regulate the supercapacitor voltage without a need for GSC. The proposed system is investigated and simulated in MATLAB Simulink at various wind speeds to validate the results and demonstrate the dynamic performance of the system.

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Section: Cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quasi Self-Excited DFIG-Based Wind Energy Conversion System

Akbari

Izadian

Weissbach

2021

IEEE Trans. on Ind. Applicat.

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“…The blade surface lift force is calculated by utilizing the vortex method in [27]. In [28] and [29], the scholars develop an aeroelastic fatigue, aerodynamics, structures, and turbulence (FAST) model of a wind turbine and offshore wind farm application (OWFA) model combined with an actuation model considering the influence of blade deformation on wind turbine wakes. An improved k-ε turbulence model is presented for the numerical simulation of wind turbine wakes.…”

Section: Semi-empirical Modelmentioning

confidence: 99%

A Modified Reynolds-Averaged Navier–Stokes-Based Wind Turbine Wake Model Considering Correction Modules

Xing

et al. 2020

Energies

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Increasing wind power generation has been introduced into power systems to meet the renewable energy targets in power generation. The output efficiency and output power stability are of great importance for wind turbines to be integrated into power systems. The wake effect influences the power generation efficiency and stability of wind turbines. However, few studies consider comprehensive corrections in an aerodynamic model and a turbulence model, which challenges the calculation accuracy of the velocity field and turbulence field in the wind turbine wake model, thus affecting wind power integration into power systems. To tackle this challenge, this paper proposes a modified Reynolds-averaged Navier–Stokes (MRANS)-based wind turbine wake model to simulate the wake effects. Our main aim is to add correction modules in a 3D aerodynamic model and a shear-stress transport (SST) k-ω turbulence model, which are converted into a volume source term and a Reynolds stress term for the MRANS-based wake model, respectively. A correction module including blade tip loss, hub loss, and attack angle deviation is considered in the 3D aerodynamic model, which is established by blade element momentum aerodynamic theory and an improved Cauchy fuzzy distribution. Meanwhile, another correction module, including a hold source term, regulating parameters and reducing the dissipation term, is added into the SST k-ω turbulence model. Furthermore, a structured hexahedron mesh with variable size is developed to significantly improve computational efficiency and make results smoother. Simulation results of the velocity field and turbulent field with the proposed approach are consistent with the data of real wind turbines, which verifies the effectiveness of the proposed approach. The variation law of the expansion effect and the double-hump effect are also given.

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“…Therefore, any and all information that can help to make a decision in advance, is crucial and has a significant economic impact [8]. Furthermore, offshore installed power is increasing year after year [9] and the general tendency of the wind turbine sizes is to grow [10]. In offshore wind energy, the atmospheric conditions that may be present, with factors such as high winds and the seawaves [11], complicate the work and the crane cost multiplies compared to onshore wind energy [12], so predictive maintenance is even more important [13].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Gearbox Oil Maintenance Procedures in Wind Energy II

Salgado¹,

Martínez

Gutierrez

et al. 2021

Energies

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Recent works have addressed the analysis of some situations that alter the gearbox oil results in wind energy conversion systems (WECS). This work contributes by completing the analysis of additional situations, based on key operational data collected from 10 different multi-megawatt wind turbines at two different locations with two top-tier technologies, and has demonstrated that the oil analysis results can be altered in practice. As important as detecting these situations is to verify how the data collected by the different operators and transferred to the laboratories, this relevant information is not included in most cases. The issues that can stem from this lack of valuable data can be mitigated with a new and more complete template. This paper proposes a detailed template that is ready for an industrial use and contributes to standardizing the information handled by all actors. The suggested template, which is designed based on extensive experimental results and an in-depth analysis, provides detailed information for laboratories to improve conclusions, recommendations and action plans. The investigation provides a high archival value for researchers whose investigation deals with gearbox oil maintenance. Furthermore, the global impact of the proposal on the wind industry can be very relevant in terms of benefits and it will ultimately be an advance in the evolution of the operation and maintenance of wind farms.

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Techno-economic analysis of a hydraulic transmission for floating offshore wind turbines

Cited by 21 publications

References 22 publications

Quasi Self-Excited DFIG-Based Wind Energy Conversion System

Quasi Self-Excited DFIG-Based Wind Energy Conversion System

A Modified Reynolds-Averaged Navier–Stokes-Based Wind Turbine Wake Model Considering Correction Modules

Analysis of the Gearbox Oil Maintenance Procedures in Wind Energy II

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