The Steady-State Characteristic Analysis of 2MW PMSG based Direct-Drive Offshore Wind Turbine

This paper presents steady-state performance modeling and analysis of a novel wind powered system that concurrently exploits thermocline thermal energy through deep sea water extraction in conjunction with offshore wind energy for combined power and thermal energy production. A single offshore wind turbine rotor directly coupled to a large positive displacement pump is modeled to supply deep sea water at high pressure to a land-based plant, the latter consisting of a hydro-electric generator coupled to a heat exchanger. The steady-state power-wind speed characteristics for the system are derived from a numerical thermofluid model. The latter integrates the hydraulic characteristics of the wind turbine-pump combination and a numerical code to simulate the heat gained/lost by deep sea water as it flows through a pipeline to shore. The model was applied to a hypothetical megawatt-scale wind turbine installed at a deep offshore low wind site in the vicinity of the Central Mediterranean island of Malta. One year of wind speed and ambient measurements were used in conjunction with marine thermocline data to estimate the time series electricity and thermal energy yields. The total energy yield from the system was found to be significantly higher than that from a conventional offshore wind turbine generator (OWTG) that only produces electricity. It could be shown that at sites having less energetic wind behavior and high ambient temperatures as a result of a hotter climate, the cooling energy component that can be delivered from such a system is relatively high even at periods of low wind speeds.

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Demonstration of Next-Generation Floating Offshore Wind Turbine

JOURNAL OF THE JAPAN WELDING SOCIETY ◽

10.2207/jjws.88.45 ◽

2019 ◽

Vol 88 (1) ◽

pp. 45-49

Author(s):

Fuminori HIOKI

Keyword(s):

Wind Turbine ◽

Offshore Wind ◽

Offshore Wind Turbine ◽

Next Generation ◽

Floating Offshore Wind Turbine

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JOINT PROBABILITY DISTRIBUTION MODEL OF WIND AND WAVES FOR OFFSHORE WIND TURBINE IN JAPAN SEA AREA

Journal of Japan Society of Civil Engineers Ser B3 (Ocean Engineering) ◽

10.2208/jscejoe.75.i_31 ◽

2019 ◽

Vol 75 (2) ◽

pp. I_31-I_36

Author(s):

Yoji TANAKA ◽

Takeshi YOSHIOKA ◽

Keiji NAKAI ◽

Toshihiko NAGAI

Keyword(s):

Probability Distribution ◽

Wind Turbine ◽

Joint Probability ◽

Japan Sea ◽

Offshore Wind ◽

Distribution Model ◽

Offshore Wind Turbine ◽

Joint Probability Distribution ◽

Sea Area

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Experimental Study for SPAR Type Floating Offshore Wind Turbine With Blade-Pitch Control

Volume 8: Ocean Renewable Energy ◽

10.1115/omae2013-10649 ◽

2013 ◽

Cited By ~ 6

Author(s):

Toshiki Chujo ◽

Yoshimasa Minami ◽

Tadashi Nimura ◽

Shigesuke Ishida

Keyword(s):

Wind Turbine ◽

Wind Farm ◽

Offshore Wind ◽

Scale Model ◽

Offshore Wind Turbine ◽

Experimental Proof ◽

Pitch Control ◽

Model Experiments ◽

North Eastern ◽

North Eastern Part

The experimental proof of the floating wind turbine has been started off Goto Islands in Japan. Furthermore, the project of floating wind farm is afoot off Fukushima Prof. in north eastern part of Japan. It is essential for realization of the floating wind farm to comprehend its safety, electric generating property and motion in waves and wind. The scale model experiments are effective to catch the characteristic of floating wind turbines. Authors have mainly carried out scale model experiments with wind turbine models on SPAR buoy type floaters. The wind turbine models have blade-pitch control mechanism and authors focused attention on the effect of blade-pitch control on both the motion of floater and fluctuation of rotor speed. In this paper, the results of scale model experiments are discussed from the aspect of motion of floater and the effect of blade-pitch control.

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