Active control for multi-degree-of-freedom wave energy converters with load limiting

Hillis, Andrew; Whitlam, Craig; Brask, Annette; Chapman, John; Plummer, Andrew

doi:10.1016/j.renene.2020.05.073

Cited by 19 publications

(19 citation statements)

References 24 publications

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“…PTO and mooring forces have been simplified with a spring-damper and a spring respectively to reduce the computational time and the complexity involved in the optimisation. However, a more realistic PTO should take in account the designed hydraulic PTO system of the WaveSub device (Hillis et al, 2020). The PTO force of an hydraulic system was obtained using a Coulomb damping model in (Babarit et al, 2012) to approximate the force given by the high and the low pressure accumulators.…”

Section: Discussionmentioning

confidence: 99%

Genetic based optimisation of the design parameters for an array-on-device orbital motion wave energy converter

et al. 2020

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Section: Discussionmentioning

confidence: 99%

Genetic based optimisation of the design parameters for an array-on-device orbital motion wave energy converter

et al. 2020

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“…The AC/DC/AC converter [23], [46], [55]- [64], [47]- [54], a combination of an AC/DC converter, a DC link capacitor, or battery storage, followed by a DC/AC converter, is the most commonly used topology for WEC technologies today. This combination is due to the fact that the generator used in most WEC devices is a rotary-type generator with a fixed output frequency.…”

Section: Power Conversion Technologymentioning

confidence: 99%

A Review of Power Electronics for Nearshore Wave Energy Converter Applications

et al. 2022

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In compliance with the green energy policy, mitigation from high fossil fuel dependency is becoming a new objective for most countries, including Malaysia. Wave energy is among extensively explored renewable energy relatively clean, sustainable, and inexhaustible resources. To this day, neither definite wave energy technology nor widely available commercial wave farm supplying the grid has existed. Therefore, wave energy harvesting is the most compelling solution, especially in regions where the possibility of grid connection is low in the nearest future. Like other renewable energy, the voltage amplitude and frequency generated from waves are unstable and may vary continuously. This uncertainty has created energy transfer challenges since the grid requires a stable and uninterrupted energy supply. Therefore, power electronics devices are employed to modulate the controller circuits' pulse width. Further understanding of the relationship between wave energy conversion technology and its power conversion, particularly for nearshore applications, is summarized. This work also discussed selected wave energy conversion research and power conversion system implemented and studied in Malaysia. Finally, this review can provide extensive overview and broad understanding into power conversion system for Wave Energy Conversion, especially for nearshore applications.

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“…The three degrees of a freedom model of a WEC is presented in [25], where the capture performance of various PTO systems is investigated for a linear plant model. An active control strategy based on the optimal velocity trajectory tracking for a multi-DoF submerged point absorber WEC is presented in [26], where a linearized dynamic system model is considered along with an ideal PTO mechanism. A nonlinear MPC design and implementation based on differential flatness parameterization has been proposed in [27].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Nonlinear Model Predictive Controller for Multiple Degrees of Freedom Wave Energy Converters with Non-Ideal Power Take-Off

Haider

Brekken

McCall³

2021

JMSE

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An increase in wave energy converter (WEC) efficiency requires not only consideration of the nonlinear effects in the WEC dynamics and the power take-off (PTO) mechanisms, but also more integrated treatment of the whole system, i.e., the buoy dynamics, the PTO system, and the control strategy. It results in an optimization formulation that has a nonquadratic and nonstandard cost functional. This article presents the application of real-time nonlinear model predictive controller (NMPC) to two degrees of freedom point absorber type WEC with highly nonlinear PTO characteristics. The nonlinear effects, such as the fluid viscous drag, are also included in the plant dynamics. The controller is implemented on a real-time target machine, and the WEC device is emulated in real-time using the WECSIM toolbox. The results for the successful performance of the design are presented for irregular waves under linear and nonlinear hydrodynamic conditions.

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Active control for multi-degree-of-freedom wave energy converters with load limiting

Cited by 19 publications

References 24 publications

Genetic based optimisation of the design parameters for an array-on-device orbital motion wave energy converter

Genetic based optimisation of the design parameters for an array-on-device orbital motion wave energy converter

A Review of Power Electronics for Nearshore Wave Energy Converter Applications

Real-Time Nonlinear Model Predictive Controller for Multiple Degrees of Freedom Wave Energy Converters with Non-Ideal Power Take-Off

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