Performance prediction of a multi-MW wind turbine adopting an advanced hydrostatic transmission

Silva, Paolo; Giuffrida, Antonio; Fergnani, Nicola; Macchi, Ennio; Cantù, Matteo; Suffredini, Roberto; Schiavetti, M.; Gigliucci, G.

doi:10.1016/j.energy.2013.11.034

Cited by 39 publications

(28 citation statements)

References 23 publications

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“…From a modeling perspective, the mechanical rather than volumetric efficiency is dependent on the current displacement of the pump. This is discussed by Silva et al [17], who attribute this change in behavior to the fact that inactive pistons induce negligible volumetric losses, since their chamber pressure is approximately equal to the inlet pressure. On the other hand, the mechanical efficiency is affected since inactive pistons still induce frictional losses, and without contributing anything to the power conversion process, they inevitably reduce the efficiency.…”

Section: (3)mentioning

confidence: 88%

See 1 more Smart Citation

Control of an Open-Loop Hydraulic Offshore Wind Turbine Using a Variable-Area Orifice

Buhagiar

Sant

Bugeja

2015

Volume 9: Ocean Renewable Energy

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The viability of offshore wind turbines is presently affected by a number of technical issues pertaining to the gearbox and power electronic components. Current work is considering the possibility of replacing the generator, gearbox and electrical transmission with a hydraulic system. Efficiency of the hydraulic transmission is around 90% for the selected geometries, which is comparable to the 94% expected for conventional wind turbines. A rotor-driven pump pressurises seawater that is transmitted across a large pipeline to a centralised generator platform. Hydroelectric energy conversion takes place in Pelton turbine. However, unlike conventional hydro-energy plants, the head available at the nozzle entry is highly unsteady. Adequate active control at the nozzle is therefore crucial in maintaining a fixed line pressure and an optimum Pelton turbine operation at synchronous speed. This paper presents a novel control scheme that is based on the combination of proportional feedback control and feed forward compensation on a variable area nozzle. Transient domain simulation results are presented for a Pelton wheel supplied by sea water from an offshore wind turbine-driven pump across a 10 km pipeline. NOMENCLATURE

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Section: (3)mentioning

confidence: 88%

“…The loss coefficients are shown in Table 1, they are obtained from a study by Silva et al [17], for a multi-megawatt DD transmission coupled to a wind turbine rotor. A fundamental aspect of the lumped model technique is that these three terms are taken to remain constant throughout the operation of the pump [18].…”

Section: (3)mentioning

confidence: 99%

Control of an Open-Loop Hydraulic Offshore Wind Turbine Using a Variable-Area Orifice

Buhagiar

Sant

Bugeja

2015

Volume 9: Ocean Renewable Energy

View full text Add to dashboard Cite

show abstract

“…In addition, as the generator can be moved to the ground, only the hydraulic pump is installed in the nacelle, making it possible to reduce the head mass by 20-40% and tower mass by up to 50%, as well as to significantly save on maintenance costs [10]. However, as hydraulic transmission has a lower overall system efficiency compared to mechanical transmission, a detailed study on power generation efficiency is required for system development [11,12].…”

Section: Research Backgroundmentioning

confidence: 99%

Wind Turbine Generator Efficiency Based on Powertrain Combination and Annual Power Generation Prediction

2018

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Featured Application: SimulationX is graphical-user-interface-based commercial software that is considerably useful for developing and analyzing a mechanical system as a single simulation environment because it can be easily applied in various research fields such as structural analysis, flow analysis, controllers, and dynamics.Abstract: Wind turbine generators are eco-friendly generators that produce electric energy using wind energy. In this study, wind turbine generator efficiency is examined using a powertrain combination and annual power generation prediction, by employing an analysis model. Performance testing was conducted in order to analyze the efficiency of a hydraulic pump and a motor, which are key components, and so as to verify the analysis model. The annual wind speed occurrence frequency for the expected installation areas was used to predict the annual power generation of the wind turbine generators. It was found that the parallel combination of the induction motors exhibited a higher efficiency when the wind speed was low and the serial combination showed higher efficiency when wind speed was high. The results of predicting the annual power generation considering the regional characteristics showed that the power generation was the highest when the hydraulic motors were designed in parallel and the induction motors were designed in series.

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“…Since the generation device can be separated from the wind turbine and installed at the ground level, the system requires less maintenance and makes installation more convenient in comparison with traditional gearbox transmission systems [5,6]. With the help of hydrostatic [5,6]. With the help of hydrostatic accumulators, short-term energy storage can be achieved to capture more energy and smooth output power [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…It allows mechanically-decoupled operation of the wind turbine and the generator over a wide range of wind speeds without the need of mechanical gearboxes. Since the generation device can be separated from the wind turbine and installed at the ground level, the system requires less maintenance and makes installation more convenient in comparison with traditional gearbox transmission systems [5,6]. With the help of hydrostatic [5,6].…”

Section: Introductionmentioning

confidence: 99%

Research on an Integrated Hydrostatic-Driven Electric Generator with Controllable Load for Renewable Energy Applications

Wang

2017

Energies

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Abstract:A hydrostatic transmission is a promising technology in renewable energy harvesting, such as wind energy and wave energy, where the hydrostatic-driven electric generator is a key energy conversion component. By using analytical and experimental methods, this paper investigates the performance of a novel hydrostatic-driven electric generator which integrates the functions of an axial piston hydrostatic motor and a permanent magnet electric generator together. The experimental platform consists of a prototype, an adjustable hydrostatic power source, a controllable electrical load, and various sensors. Energy conversions between hydrostatic and electrical forms are evaluated under different operating velocities and control signals. Power loss distributions are presented by combining measured data and analytical calculation. Thermal experiments are implemented under both of natural and oil-forced cooling conditions and it is found that the temperature rise is much lower when the machine is cooled by hydraulic oil. The experiments validate the energy conversion efficiency, steady controllability, and cooling capability of the integrated hydrostatic-driven electric generator. The results can provide references for further efficiency optimization, dynamic control, as well as practical application.

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Performance prediction of a multi-MW wind turbine adopting an advanced hydrostatic transmission

Cited by 39 publications

References 23 publications

Control of an Open-Loop Hydraulic Offshore Wind Turbine Using a Variable-Area Orifice

Control of an Open-Loop Hydraulic Offshore Wind Turbine Using a Variable-Area Orifice

Wind Turbine Generator Efficiency Based on Powertrain Combination and Annual Power Generation Prediction

Research on an Integrated Hydrostatic-Driven Electric Generator with Controllable Load for Renewable Energy Applications

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