Linear electrical generator topologies for direct‐drive marine wave energy conversion‐ an overview

Faiz, Jawad; Saberi, Alireza

doi:10.1049/iet-rpg.2016.0726

Cited by 82 publications

(36 citation statements)

References 82 publications

(103 reference statements)

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“…An example is depicted in Figure 2, where the stator is sectioned in order to show the position of coils. A detailed classification of linear generators is reported in [41]. Considering the shape of the generator, the following definition are adopted:…”

Section: Background On Linear Generator Topologymentioning

confidence: 99%

A New Solution for Sea Wave Energy Harvesting, the Proposal of an Ironless Linear Generator

Curto¹,

Viola²,

Franzitta³

et al. 2020

JMSE

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The paper investigates an innovative ironless linear generator, installable inside a wave energy converter, in order to produce electricity from sea waves. This energy source is considered strategic for the future, especially in small islands; however, this technology is still far from the commercial phase. Considering the wave energy potential of the Mediterranean Sea, a first prototype of the electrical linear generator was realized at the Department of Engineering of Palermo University. This machine can be run by a two-floating buoys system, able to produce a linear vertical motion. The main goal of this paper is the investigation of the advantages and the disadvantages of the utilization of steel materials to realize the stator of linear generators. Thus, starting from the prototype, the authors analyzed the effects produced by the replacement of steel in the stator with a non-magnetic material. For comparison, the authors evaluated the amplitude of no-load voltages, using a three-phase connection scheme, and the amplitude of the magnetic force produced by the interaction of magnets with the stator. Both aspects were evaluated through numerical simulations and mathematical models.

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Section: Background On Linear Generator Topologymentioning

confidence: 99%

A New Solution for Sea Wave Energy Harvesting, the Proposal of an Ironless Linear Generator

Curto¹,

Viola²,

Franzitta³

et al. 2020

JMSE

View full text Add to dashboard Cite

show abstract

“…The energy flux, per unit-width, through a vertical plane that is perpendicular to the wave propagation direction is the average power density (2) per unit-width dl [Pw]. Then, the average power available Pw(Le) in a wave-train with T period and Le width, can be accounted for with (3).…”

Section: Introductionmentioning

confidence: 99%

“…Linear-oscillating magnetic transducers can be used for direct wave energy conversion to electricity. These transducers are usually made with a coil and a permanent magnet [2].Sea waves are generated when wind passes over the water surface. As the sea waves propagate slower than the wind speed causing them, the energy is transferred from the wind to the waves.…”

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confidence: 99%

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Analysis of Sliding-Mode Controlled Impedance Matching Circuits for Inductive Harvesting Devices

et al. 2019

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A sea-wave energy harvesting, articulated device is presented in this work. This hand-made, wooden device is made combining the coil windings of an array of three single transducers. Taking advantage of the sea waves sway, a linear oscillating motion is produced in each transducer generating an electric pulse. Magnetic fundamentals are used to deduce the electrical model of a single transducer, a solenoid-magnet device, and after the model of the whole harvesting array. The energy obtained is stored in a battery and is used to supply a stand-alone system pay-load, for instance a telecom relay or weather station. To maximize the harvested energy, an impedance matching circuit between the generator array and the system battery is required. Two dc-to-dc converters, a buck-boost hybrid cell and a Sepic converter are proposed as impedance adaptors. To achieve this purpose, sliding mode control laws are introduced to impose a loss free resistor behavior to the converters. Although some converters operating at discontinuous conduction mode, like the buck-boost converter, can exhibit also this loss free resistor behavior, they usually require a small input voltage variation range. By means of sliding mode control the loss free resistor behavior can be assured for any range of input voltage variation. After the theoretical analysis, several simulation and experimental results to compare both converters performance are given.

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“…PMLGs for single-body point absorbers were discussed in [20,21] and for two-body floating point absorbers in [22]. Various topologies for PMLG for wave power conversion were summarized in [23], and some generator designs were compared in [23][24][25][26]. The type of magnets in the LG affects the performance and sustainability of the WEC.…”

Section: Introductionmentioning

confidence: 99%

Study of an Altered Magnetic Circuit of a Permanent Magnet Linear Generator for Wave Power

et al. 2017

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The wave energy converter (WEC) studied and developed at Uppsala University in Sweden is a point absorbing buoy connected to a linear generator (LG) on the seabed. Previous studies have improved the sustainability of the generator, changing its magnets from Nd 2 Fe 14 B-magnets to ferrites. In this paper, the magnetic circuit of the linear generator is further studied. Ferrite magnets of two different types (Y30 and Y40) are studied along with different shapes of pole shoes for the system. The finite element method (FEM) simulations in a program called Ace are performed. The results show that a linear generator including both Y30 and Y40 magnets and shortened T-shaped pole shoes can generate a similar magnetic energy in the airgap as a linear generator only containing Y40 magnets and rectangular pole shoes. This shows that the magnetic circuit can be altered, opening up sizes and strengths of magnets for different retailers, and thereby possibly lowering magnet cost and transportation. This work was previously presented as a conference at the European Wave and Tidal Energy Conference (EWTEC) 2017 in Cork, Ireland; this manuscript has been carefully revised and some discussions, on magnet costs for example, have been added to this paper.

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Linear electrical generator topologies for direct‐drive marine wave energy conversion‐ an overview

Cited by 82 publications

References 82 publications

A New Solution for Sea Wave Energy Harvesting, the Proposal of an Ironless Linear Generator

A New Solution for Sea Wave Energy Harvesting, the Proposal of an Ironless Linear Generator

Analysis of Sliding-Mode Controlled Impedance Matching Circuits for Inductive Harvesting Devices

Study of an Altered Magnetic Circuit of a Permanent Magnet Linear Generator for Wave Power

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