Design optimization of linear permanent magnet generator for wave energy conversion

Memon, Aamir Hussain; Ibrahim, Taib; Nallagowden, Perumal

doi:10.1109/cencon.2015.7409561

Cited by 15 publications

(4 citation statements)

References 18 publications

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“…The dynamic changes in the topological structure of the linear PM generator with time can be very complicated, so it is difficult to get accurate design optimisation using the traditional parametric equations. Hence, numerical analysis of the field distribution has been used to facilitate performance valuation [112]. Numerical analysis, such as the finite element method (FEM), provides accurate magnetic field distribution.…”

Section: Design Optimisation To Maximize the Performancementioning

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: Design Optimisation To Maximize the Performancementioning

confidence: 99%

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

2022

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“…Wave energy is converted into electricity by using various power take-off (PTO) technologies, of which direct drive wave energy converter (DD-WEC) has simpler configuration, higher efficiency and better development prospect [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A Stator-PM Transverse Flux Permanent Magnet Linear Generator for Direct Drive Wave Energy Converter

et al. 2021

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Transverse flux permanent magnet linear generator (TF-PMLG) is widely used in direct drive wave energy converter (DD-WEC) because of its high power density. Traditional transverse flux machine (TFM) is designed and built in form of translator-PM. But translator-PM configuration needs a large amount of PM and the cost is high in long stroke application, like DD-WEC. Recently, the stator-PM linear machines have gained more attention for reducing the PM volume and improving the generator performances under low-speed conditions. In this paper, a novel stator-PM TF-PMLG for DD-WEC has been proposed. The fundamental configuration and operation principle of the generator are illustrated. Then, the expressions of the back EMF and the electromagnetic thrust are derived by magnetic circuit analysis. Main dimension parameters, such as PM thickness, central angle of the outer stator shoe and pole pitch are determined and optimized based on finite element analysis (FEA). This topology has advantages of low PM consumption and high power density, and is a suitable candidate for long stroke applications, like DD-WEC, in which a high power per PM volume is usually needed to reduce the amount of permanent magnet and ensure high power density.

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“…The permanent magnet linear generator (PMLG) translator can be driven directly by the buoy heave motion. However, slow wave motions and excessive required control force will demand a high force density on the PMLG system [7]. The PMLG design study, which aims to improve the power generation efficiency on WECs, has been discussed in many studies.…”

Section: Introductionmentioning

confidence: 99%

Power Take-Off and Energy Storage System Static Modeling and Sizing for Direct Drive Wave Energy Converter to Support Ocean Sensing Applications

Zhou

Abdelkhalik

Weaver

2020

JMSE

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This paper addresses the sizing and design problem of a permanent magnet electrical machine power take-off system for a two-body wave energy converter, which is designed to support ocean sensing applications with sustained power. The design is based upon ground truth ocean data bi-spectrums (swell and wind waves) from Martha’s Vineyard Coastal Observatory in the year 2015. According to the ground truth ocean data, the paper presents the optimal harvesting power time series of the whole year. The electrical machine and energy storage static modeling are introduced in the paper. The paper uses the ground truth ocean data in March to discuss the model integration of the buoy dynamic model, the power take-off model, and the energy storage model. Electrical machine operation constraints are applied to ensure the designed machine can fulfill the buoy control requirements. The electrical machine and energy storage systems operation status is presented as well. Furthermore, rule-based control strategies are applied to the electrical machine for fulfilling specific design demands, such as improving power generating efficiency and downsizing the electrical machine scale. The corresponding required capacities of the energy storage system are discussed. This paper relates results to the wave data sets (different combinations of significant wave heights and periods of both swell and wind waves). In this way, the power take-off system rule-based control strategy determinations can rely on current ocean wave measurements instead of a large historical ocean wave database.

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Design optimization of linear permanent magnet generator for wave energy conversion

Cited by 15 publications

References 18 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 Stator-PM Transverse Flux Permanent Magnet Linear Generator for Direct Drive Wave Energy Converter

Power Take-Off and Energy Storage System Static Modeling and Sizing for Direct Drive Wave Energy Converter to Support Ocean Sensing Applications

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