A novel permanent magnet tubular linear generator for ocean wave energy

Prudell, Joe; Stoddard, M.W.; Brekken, Ted K. A.; Jouanne, Annette von

doi:10.1109/ecce.2009.5316224

Cited by 19 publications

(7 citation statements)

References 8 publications

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“…The spar was a central cylindrical design housing a bobbin wound with a three-phase armature, and the float was an outside cylinder that consisted of 960 magnets. The float's inner surface faced the spar's outer surface, and when the float moved up and down due to the wave motion, the voltage was directly produced inside the armature [27]. The device was around 3.3 m high and 1.2 m wide, with 10 kW of rated power [28].…”

Section: Single-body Heaving Buoy Systemmentioning

confidence: 99%

A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems

2022

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The traditional wave energy converters (WECs) use hydraulic or turbine-type power take-off (PTO) mechanisms which consist of many moving parts, creating mechanical complexity and increasing the installation and maintenance costs. Linear generator-based direct-drive WECs could be a solution to overcome this problem, but the efficiency of the single conventional linear generator is not high enough, and it cannot work satisfactorily in the low-frequency range. This article reviews the recent research developments of the linear permanent magnet (PM) generator-based WEC to harness maximum energy from ocean waves. It starts with a brief introduction and background of wave energy converters using linear generators. Following this, the working principle of the WECs with linear PM generators is briefly outlined. Subsequently, the analytical model of the linear PM generator-based WEC is studied. After that, the up-to-date developments of the linear PM generator-based PTO systems are studied. Despite some modifications resulting in complexity in the linear PM generator’s structure and a rise in manufacturing costs, the study shows the systems’ efficiencies increased by increasing magnetic flux and reducing cogging force. The key parameters and improvement issues that can increase the performances and efficiencies of the PTO systems are identified to help future researchers for further development. Moreover, the review discusses the numerical and experimental analysis tools, the typical control systems used by the researchers and the challenges of the linear generator-based wave energy conversion system. Finally, conclusions about the significant beneficial characteristics and design choice of the WEC linear generator structure are provided and related to the application conditions.

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Section: Single-body Heaving Buoy Systemmentioning

confidence: 99%

A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems

2022

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“…The spar was of the central cylindrical three-phase armature design, and connected to the float was the outside cylinder, housing 960 magnets. This arrangement enabled electromagnetic flux to be induced in the armature winding by the up-and-down motion of the waves, producing electromotive force [67]. A wave research site was established in 2002 by the Uppsala University, where around 14 prototypes of WEC were installed and tested [66,[68][69][70][71][72].…”

Section: Direct Linear Electrical Output-based Pto Systemsmentioning

confidence: 99%

A Critical Review of Power Take-Off Wave Energy Technology Leading to the Conceptual Design of a Novel Wave-Plus-Photon Energy Harvester for Island/Coastal Communities’ Energy Needs

et al. 2022

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As the global interest in renewable energy generation continues, the need to develop new and innovative solutions is being explored every day throughout the world by researchers and innovators. Hybrid renewable energy innovations are gaining progressive interest not only because of the threat of climate change but also due to the technological advancements seen in renewables. Ocean waves have immense potential as a renewable energy source, and related technologies have advanced continuously over the past few decades. In response, this paper extensively studies wave energy converters (WECs) based on the power take-off (PTO) technique, and presents a novel hybrid wave-plus-photon energy (HWPE) harvester called Wavevoltaics, based on wave and solar energy capture systems for coastal communities’ power needs, in line with decarbonization measures. The HWPE harvester uses a simple rack-and-pinion mechanism in combination with solar cell technology to convert the wave energy into usable electrical energy in a water column structural design. This novel HWPE device can be used to provide power for lighting and gadgets for coastal communities that rely heavily on fossil fuels for their lighting and electrical needs. Later in the paper, the challenges faced in hybrid wave energy development are presented.

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“…The direct drive PTO model presented in this paper is based on [17]. The generator stator consists of three-phase armature windings in 4 slots per phase for a total of 12 slots.…”

Section: Direct Drive Ptomentioning

confidence: 99%

“…Figures 16 and 17 show voltage and current in the external load. It should be noted that the magnitude of the voltage and current depends on the wave climate, and the WEC design parameters [17]. The absorbed and electric power are shown in Fig.…”

Section: Direct Drive Ptomentioning

confidence: 99%

Development of PTO-Sim: A Power Performance Module for the Open-Source Wave Energy Converter Code WEC-Sim

Simmons

Brekken

et al. 2015

Volume 9: Ocean Renewable Energy

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WEC-Sim (Wave Energy Converter-SIMulator) is an opensource wave energy converter (WEC) code capable of simulating WECs of arbitrary device geometry subject to operational waves. The code is developed in MATLAB/Simulink using the multi-body dynamics solver SimMechanics, and relies on Boundary Element Method (BEM) codes to obtain hydrodynamic coefficients such as added mass, radiation damping, and wave excitation. WEC-Sim Version 1.0, released in Summer 2014, models WECs as a combination of rigid bodies, joints, linear power take-offs (PTOs), and mooring systems. This paper outlines the development of PTO-Sim (Power Take Off-SIMulator), the WEC-Sim module responsible for accurately modeling a WEC's conversion of mechanical power to electrical power through its PTO system. PTO-Sim consists of a Simulink library of PTO component blocks that can be linked together to model different PTO systems. Two different applications of PTO-Sim will be given in this paper: a hydraulic power take-off system model, and a direct drive power take-off system model. ators, pistons, and accumulators. Two different applications of PTO-Sim will be given in this paper: a hydraulic power take-off system model, and a linear direct drive power take-off system model.

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A novel permanent magnet tubular linear generator for ocean wave energy

Cited by 19 publications

References 8 publications

A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems

A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems

A Critical Review of Power Take-Off Wave Energy Technology Leading to the Conceptual Design of a Novel Wave-Plus-Photon Energy Harvester for Island/Coastal Communities’ Energy Needs

Development of PTO-Sim: A Power Performance Module for the Open-Source Wave Energy Converter Code WEC-Sim

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