Analysis of a Hybrid Field-Modulated Linear Generator For Wave Energy Conversion

Huang, Lei; Chen, Minshuo; Wang, Linlin; Fuchang, Yue; Guo, Rong; Fu, Xiangyun

doi:10.1109/tasc.2018.2796549

Cited by 31 publications

(13 citation statements)

References 12 publications

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“…Linear Electric Machines are ideal for this mode of operation; their main limitation in comparison with their hydraulic counterparts is their smaller total force capacity as well as the smaller force per unit mass. Different types of Linear Generators have been proposed for this application, [12]- [18] some of which are based on Self-Excited Machines using Permanent Magnets with different configurations while others are based on non Self-Excited solutions like the one chosen for the Sea Titan Project whose main goal is to develop a new configuration of Linear Switched Reluctance Machine (LSRM) aimed at achieving higher specific forces and efficiencies. The conceptual study of a Superconducting version of a LSRM is also included in the Project.…”

Section: Background: Heaving Point Absorbersmentioning

confidence: 99%

New Type of Linear Switched Reluctance Generator for Wave Energy Applications

García-Tabarés

Lafoz

Blanco

et al. 2020

IEEE Trans. Appl. Supercond.

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Wave energy conversion is a promising alternative to produce clean energy from the huge available resource at sea, but it is also a challenging mission because extraction conditions are difficult due to the harsh environment and also to the low frequency of the energy conversion process. In this regard, powerful Power TakeOffs are required, able to produce high forces at low frequencies, which also must be highly controllable to optimize the conversion process. This paper presents a new type of Linear Electric Generator based on a novel Switched Reluctance Machine, which is being developed in the framework of a H2020 Project called Sea Titan. The paper describes the calculation and the design processes of a 70 kN prototype which will also be manufactured and tested in the framework of Sea Titan, which also includes a feasibility study for a superconducting solution.

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Section: Background: Heaving Point Absorbersmentioning

confidence: 99%

New Type of Linear Switched Reluctance Generator for Wave Energy Applications

García-Tabarés

Lafoz

Blanco

et al. 2020

IEEE Trans. Appl. Supercond.

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“…Field-modulated tubular linear generators are designed to overcome the disadvantages of the heavy generator and low frequency of ocean waves [86,92,53]. Some new excitation winding configurations were used to improve power density [93] where Du et al proposed a direct-drive mutually coupled linear switched reluctance machine (MCLSRM) which had better utilized the magnetic and electric circuits and generated a higher voltage than the fieldmodulated tubular linear generators.…”

Section: Direct Drive and In-direct Drive Power Take-off Systemsmentioning

confidence: 99%

“…[52]. Slow speed direct drive electrical machines have been designed specifically for WECs[53], although demonstrators have always had the tight moorings to the sea bed to provide the reaction force. Linear machines have been proven to be capable of being tuned for power-take-off of WECs.…”

mentioning

confidence: 99%

A Survey of Power Take-off Systems of Ocean Wave Energy Converters

Z¹,

Zhang²,

Xiao³

et al. 2019

Preprint

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Ocean wave energy conversion as one of the renewable clean energy sources is attracting the research interests of many people. This review introduces different types of power take-off technology of wave energy converters. The main focus is the linear direct drive power take-off devices as they have the advantages for ocean wave energy conversion. The designs and optimizations of power take-off systems of ocean wave energy converters have been studied from reviewing the recently published literature. Also, the simple hydrodynamics of wave energy converters have been reviewed for design optimization of the wave energy converters at specific wave sites. The novel mechanical designs of the power take-off systems have been compared and investigated in order to increase the energy harvesting efficiency.

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“…In addition, field‐modulation hybrid excitation machines that utilise the magnetic gear effect and excitation winding to adjust the air‐gap flux have been studied. Notably, a dual‐stator hybrid field‐modulated linear generator [16] has been presented in which the phase angle of the AC excitation current is decided accurately by the mover position for regulating the air‐gap field. In addition, a linear Vernier PM machine using high‐temperature superconducting DC field excitation has been introduced [17] in which a cooling system and sophisticated control schemes are implemented.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field‐modulated linear permanent‐magnet generator for direct‐drive wave energy conversion

Feng

Zhao

et al. 2020

IET Electric Power Applications

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The linear permanent-magnet synchronous generator (LPMSG) for direct-drive wave energy conversion (WEC) suffers from many drawbacks that have not yet been overcome, such as a low power density and a bulky system volume. Therefore, a magnetic field-modulated linear permanent-magnet generator (FMLPMG) with a simple structure has been designed and manufactured. First, the operating principle of the FMLPMG is demonstrated by the equivalent magnetic circuit method, which explains the high power density of the FMLPMG. Second, at a constant speed and a sinusoidal speed, the electromagnetic characteristics of the FMLPMG under the no-load and load conditions are analysed by the finite-element method. Finally, a direct-drive WEC test platform is built to simulate the process of wave action on the FMLPMG. No-load and load experiments of the FMLPMG are conducted on the test platform, and the results are compared with those of an LPMSG with the same volume and operating conditions. The results show that the FMLPMG with a high power density converts wave energy effectively and solves the problem of low power density faced by the LPMSG in direct-drive WEC.

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Analysis of a Hybrid Field-Modulated Linear Generator For Wave Energy Conversion

Cited by 31 publications

References 12 publications

New Type of Linear Switched Reluctance Generator for Wave Energy Applications

New Type of Linear Switched Reluctance Generator for Wave Energy Applications

A Survey of Power Take-off Systems of Ocean Wave Energy Converters

Magnetic field‐modulated linear permanent‐magnet generator for direct‐drive wave energy conversion

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