Generation Of Electrical Power From The Florida Current Of The Gulf Stream

Davis, B.V.; Farrell, James; Swan, David H.; Jeffers, Karen

doi:10.4043/5120-ms

Cited by 9 publications

(4 citation statements)

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“…In fact, the only OCT ever successfully tested in the Gulf Stream was tested for less than a day more than two decades ago [4]. Significant public and private investment during the past decade has since helped revitalize this industry so that prototype OCT's will likely be ready for offshore testing within the next few years.…”

Section: Introductionmentioning

confidence: 98%

Design and analysis of an ocean current turbine performance assessment system

2012

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To quantify the performance of experimental ocean current turbines (OCTs) during offshore testing, important performance metrics are presented along with a proposed sensor suite and the mathematical relationships that can be used to calculate them. A numerical simulation of an OCT and numeric models of the selected sensors are utilized to synthesize measurements which are used to calculate relative free stream flow velocity, electric power output, total system efficiency, shaft power, and rotor efficiency. By evaluating the calculated performance metrics, both with and without sensor limitations, the impact of the sensor limitations on the calculated performance metrics are evaluated. The impact of averaging times on the repeatability of performance calculations are also evaluated for several operating conditions to guide offshore testing requirements. It is found that for a 2 m significant wave height the selected sensor system increases the standard deviation of the calculated performance metrics for 1 min averages and an operating depth of 10 m by 5-20%. For a depth of 20 m the OCT performance is more consistent and the sensors increase the variability of the calculated performance metrics by between 30-50% for 1 min averages. For the same significant wave height and a depth of 10 m the standard deviation of the 1 min averaged sensor measured system and rotor efficiencies for are shown to range from 0.9 and 3.3% of their mean value. However this can be decreased to a 0.13 and 0.52% if the operating depth is decreased to 10 m and the averaging time is increased to 10 min.

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Section: Introductionmentioning

confidence: 98%

Design and analysis of an ocean current turbine performance assessment system

2012

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“…Previous published works on energy harvesting from some of the most promising ocean current systems describe projects using the Agulhas current, off the south coast of Africa [10,11], the Kuroshio current near the coasts of Japan and Taiwan [12,13] and the Gulf Stream [14,15] off the north American east coast [16], and a small part of southern Mexico [17].…”

Section: Introductionmentioning

confidence: 99%

“…Several theoretical assessments have been carried out for the Gulf Stream, off the coasts of USA, including a general assessment by [30,31] and others that focused on the coast of Florida [16,[32][33][34] and off the coast of North Carolina [35]. A small part of the Gulf Stream system also affects the south of the Mexican Caribbean, particularly the state of Quintana Roo.…”

Section: Introductionmentioning

confidence: 99%

Assessing Hydrokinetic Energy in the Mexican Caribbean: A Case Study in the Cozumel Channel

et al. 2021

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This paper presents a techno-economic assessment of hydrokinetic energy of Cozumel Island, where ocean currents have been detected, but tourist activities are paramount. The main objective of this research is to identify devices that have been used to harvest hydrokinetic power elsewhere and perform an economic analysis as to their implementation in the Mexican Caribbean. First, the energy potential of the area was evaluated using simulated data available through the HYCOM consortium. Then, for four pre-commercial and commercial turbines, technical and economic analyses of their deployments were performed. Socio-environmental constraints were reviewed and discussed. Three optimal sites were identified, with an average annual hydrokinetic energy density of 3–6 MWh/m2-year. These sites meet the socio-environmental requirements for marine kinetic energy harvesting. Of the turbines considered in the analysis, the best energy price/cost ratio is that of SeaGen device, with a maximum theoretical energy extraction of 1319 MWh/year with a Capacity Factor of 12.5% and a Levelised Cost of Energy (LCOE) of 1148 USD/MWh. Using this device, but assuming a site-specific design that achieves at least 25% of Capacity Factor, 20-year useful life, and a discount rate of 0.125, the LCOE would be 685.6 USD/MWh. The approach presented here can be applied for techno-economic analyses of marine turbines in other regions.

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“…The technical design and in-water testing of moored OCT systems has been conducted by both industry and academia. The first on-site prototype testing for turbines designed to operate in deep water offshore currents was the Vertical Axis Hydro Turbine, which was developed by Nova Energy Limited and the National Research Council of Canada [24], [25]. This OCT was successfully tested from an anchored vessel in the Gulf Stream during a one-day mission in April, 1985.…”

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confidence: 99%

Modeling and Numerical Simulation of a Buoyancy Controlled Ocean Current Turbine

Hasankhani

VanZwieten²,

Tang³

et al. 2021

Int. J. Mar. Ene.

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Increased global renewable power demands and the high energy density of ocean currents have motivated the development of ocean current turbines (OCTs). These compliantly mooring systems will maintain desired near-surface operating depths using variable buoyancy, lifting surface, sub-sea winches, and/or surface buoys. This paper presents a complete numerical simulation of a 700 kW variable buoyancy controlled OCT that includes detailed turbine system, inflow, actuator (i.e., generator and variable buoyancy), sensor, and fault models. Simulation predictions of OCT performance are made for normal, hurricane, and fault scenarios. Results suggest this OCT can operate between depths of 38 m to 329 m for all homogeneous flow speeds between 1.0-2.5 m/s. Fault scenarios show that rotor braking results in a rapid vertical OCT system assent and that blade pitch faults create power fluctuations apparent in the frequency domain. Finally, simulated OCT operations in measured ocean currents (i.e., normal and hurricane conditions) quantify power statistics and system behavior typical and extreme conditions.

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Generation Of Electrical Power From The Florida Current Of The Gulf Stream

Cited by 9 publications

References 0 publications

Design and analysis of an ocean current turbine performance assessment system

Design and analysis of an ocean current turbine performance assessment system

Assessing Hydrokinetic Energy in the Mexican Caribbean: A Case Study in the Cozumel Channel

Modeling and Numerical Simulation of a Buoyancy Controlled Ocean Current Turbine

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