Stochastic Response Analysis for a Floating Offshore Wind Turbine Integrated with a Steel Fish Farming Cage

Zheng, Xiang Yuan; Lei, Yu

doi:10.3390/app8081229

Cited by 44 publications

(22 citation statements)

References 26 publications

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“…The figures have also shown that the response of the testbed to short circuit satisfies requirements of high speed, selectivity and sensitivity. Dynamic response of the testbed to the short circuits is therefore verified to be valid and consistent with established short circuit theory [18]- [21].…”

Section: Discussion Of Resultssupporting

confidence: 73%

Islanded Mode Response Verification of AC Microgrid under Symmetrical and Non-symmetrical Short Circuits

Aminu

2019

E3S Web Conf.

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The assumptions and parameters required in modeling a microgrid depend on the platform, among other variables. It is therefore pertinent to verify the response of a modeled testbed to establish its validity. This work reports on verification of the response of a wind turbines-based microgrid to symmetrical and non-symmetrical short circuits. The testbed consists of 2 units of 5.5 kW 400 V wind turbines capable of connecting to the utility. Short circuits are introduced at 6.00 second and withdrawn at 8.00 second, measuring the dynamic response of the testbed while the microgrid is in islanded mode alternately under voltage and reactive power control strategies. The response is shown to be consistent, symptomatic of the type of short circuit and therefore suitable for short circuit detection and diagnosis, verifying validity of the microgrid testbed. The testbed can therefore be used for short circuit related studies, design optimization and performance prediction.

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Section: Discussion Of Resultssupporting

confidence: 73%

Islanded Mode Response Verification of AC Microgrid under Symmetrical and Non-symmetrical Short Circuits

Aminu

2019

E3S Web Conf.

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“…However, the added damping matrix B from WAMIT only considers the radiation damping resulting from the oscillation of the steel cage in waves. Due to the fact that there are fish nets and a large number of slender members in the substructure of the WSA, the viscous drag damping induced by flow separation [14] is more significant than the radiation damping and must be taken into account for the hydrodynamic analysis. Therefore, an external liner damping matrix, B E , is introduced into WAMIT.…”

Section: Response Amplitude Operators and Natural Periods Of Wsamentioning

confidence: 99%

“…Site metocean conditions, fabrication, towing, and installation are all important factors that determine the foundation type. Although TLP was widely developed in oil and gas industry for many years, it has great challenges in terms of tendon installation, higher marine operation cost, and the change in tendon tension resulting from tidal variations [14]. The semi-submersible foundation is characterized by a large displacement and a large water plane area contributing to good hydrostatic stability.…”

Section: Introductionmentioning

confidence: 99%

An Offshore Floating Wind–Solar–Aquaculture System: Concept Design and Extreme Response in Survival Conditions

Zheng

Lei

et al. 2020

Energies

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This study presents a new concept design combining multiple megawatt (MW) vertical-axis wind turbines (VAWTs) and a solar array with a floating steel fish-farming cage. This combined wind–solar–aquaculture (WSA) system is intended to utilize the ocean space and water resources more effectively and more economically, while greatly shortening the payback period of investment in offshore power generation. The details of this WSA design are described, showing that a square-shaped fishing cage serves as a floating foundation for the 7600 m2 solar array and four multi MW VAWTs. The WAMIT program based on potential-flow theory is employed to obtain the WSA’s motion response amplitude operators (RAOs) in sinusoidal waves of varying periods. The motion RAOs indicated that the proposed concept possesses better hydrodynamic seakeeping performances than its OC3Hywind spar and OC4DeepCwind semi-submersible counterparts. A potential site located in the northwest South China Sea is selected to deploy the WSA. Its feasibility is then examined in terms of the hydrodynamic motions and structural dynamic response driven by wind, waves, and current. Fully coupled time-domain simulations are carried out for 50-year survival conditions. The whole structure exhibits outstanding performance for its small motions in random wind and seas. Moreover, under these survival conditions, the top accelerations and tower base stresses of the VAWTs and mooring line tensions readily meet the design requirements. Technically, the WSA has strong competitiveness and wide prospects in the offshore industry for both power exploitation and marine aquaculture in intermediate and deep waters.

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“…The numerical results indicated that the motions of the modified spar-type floating offshore wind turbine (FOWT) in all of the modes were smaller than those of the OC3 Hywind FOWT, except in heave mode over 0.3 rad/s. Zheng et al [32] suggested a state-of-the-art concept integrating a deep-water floating offshore wind turbine with a steel fish-farming cage (FOWT-SFFC). Aero-hydro-servo-elastic modeling and time domain simulations were carried out by FAST to examine the dynamic response of FOWT-SFFC for several environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of a Catenary Mooring System Attached by Clump Masses for Improving the Wave-Resistance Ability of a Spar Buoy-Type Floating Offshore Wind Turbine

Liu

Wang

et al. 2019

Applied Sciences

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The International Energy Agency (IEA), under the auspices of their Offshore Code Comparison Collaboration (OC3) initiative, has completed high-level design OC-3 Hywind system. In this system the wind turbine is supported by a spar buoy platform, showing good wave-resistance performance. However, there are still large values in the motion of surge degree of freedom (DOF). Addition of clump masses on the mooring lines is an effective way of reducing the surge motion. However, the optimization of the locations where the clump masses are added is still not clear. In this study, therefore, an in-house developed code is verified by comparing the results of the original OC3 model with those by FAST. The improvement of the performance of this modified platform as a function of the location of the clump masses has been examined under three regular waves and three irregular waves. In the findings of these examination, it was apparent that attaching clump masses with only one-tenth of the mass of the total mooring-line effectively reduces the wave-induced response. Moreover, there is an obvious improvement as the depth of the location where the clump masses mounted is increased.

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Stochastic Response Analysis for a Floating Offshore Wind Turbine Integrated with a Steel Fish Farming Cage

Cited by 44 publications

References 26 publications

Islanded Mode Response Verification of AC Microgrid under Symmetrical and Non-symmetrical Short Circuits

Islanded Mode Response Verification of AC Microgrid under Symmetrical and Non-symmetrical Short Circuits

An Offshore Floating Wind–Solar–Aquaculture System: Concept Design and Extreme Response in Survival Conditions

Numerical Analysis of a Catenary Mooring System Attached by Clump Masses for Improving the Wave-Resistance Ability of a Spar Buoy-Type Floating Offshore Wind Turbine

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