Study of a Multicoil Electromagnetic Wave Power Takeoff System With Pneumatic Velocity Upconversion Mechanism Targeting Low-Frequency Input

IF 3.8 2区 工程技术 Q1 ENGINEERING, CIVIL
Hao Tian;Boyang Zhou;Yongjun Gong
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Abstract

To build efficient and portable wave energy conversion devices, energy-dense power takeoff (PTO) systems are required. Contemporary PTOs developed for wave power stations are focused on the year-round averaged sea condition, leading to undesirable performance under low wave frequencies. Facing the challenge, a multicoil electromagnetic wave power takeoff (ME-PTO) with a pneumatic velocity upconversion mechanism is introduced. The new architecture features a pneumatic cylinder connected to a coiled tube to house a reciprocating permanent magnet for electricity generation, and the designed cross-sectional area differential between the magnet and piston allows for boosting the magnet speed, to deliver more capturable power. Dynamic models for the ME-PTO were established, and a numerical solution from the wave–buoy interaction to the electricity output was developed. A compact 23-mm diameter by 190 mm long prototype was built in the lab and an experimental test platform was constructed for model validation. Initial results of operation between 0.2 and 1 Hz have shown that the power density of ME-PTO can reach 72.4 W/m 3 at 0.4 Hz, and is capable of extracting more wave energy compared to a baseline 50-W mechanical PTO when the incident wave is below 0.2 Hz. Under an incident wave with a peak frequency of 0.31 Hz and amplitude below 0.5 m, the cumulative work density of the ME-PTO can be three times higher than the baseline. Even at higher wave frequencies when the three-phase motor is more efficient, the ME-PTO can still exhibit comparable work density. In addition, performance indicators, such as the yearly energy output density of the prototype, have also been compared to contemporary devices, exhibiting advantages in decimeter-level wave energy extraction.
针对低频输入的多线圈电磁波功率吸收系统与气动速度上转换机制的研究
要建造高效、便携的波浪能转换装置,就需要能量密集的动力输出(PTO)系统。目前为波浪能发电站开发的 PTO 主要针对全年平均海况,导致在低波频率下性能不佳。面对这一挑战,我们推出了一种带有气动速度上变频机制的多线圈电磁波发电装置(ME-PTO)。新结构的特点是气动气缸与卷管相连,卷管内装有用于发电的往复式永磁体,磁体与活塞之间的截面积差设计可提高磁体速度,从而提供更多可捕获功率。为 ME-PTO 建立了动态模型,并开发了从波浪-浮标相互作用到电力输出的数值解决方案。在实验室中建造了一个直径 23 毫米、长 190 毫米的紧凑型原型,并搭建了一个实验测试平台用于模型验证。在 0.2 至 1 赫兹之间运行的初步结果表明,在 0.4 赫兹时,ME-PTO 的功率密度可达 72.4 W/m3,当入射波低于 0.2 赫兹时,与基线 50 W 机械 PTO 相比,能够提取更多的波能。在峰值频率为 0.31 赫兹、振幅低于 0.5 米的入射波中,ME-PTO 的累积功密度是基线的三倍。即使在三相电机效率更高的更高波峰频率下,ME-PTO 仍能表现出相当的工作密度。此外,原型机的年能量输出密度等性能指标也与当代设备进行了比较,显示出在分米级波能提取方面的优势。
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来源期刊
IEEE Journal of Oceanic Engineering
IEEE Journal of Oceanic Engineering 工程技术-工程:大洋
CiteScore
9.60
自引率
12.20%
发文量
86
审稿时长
12 months
期刊介绍: The IEEE Journal of Oceanic Engineering (ISSN 0364-9059) is the online-only quarterly publication of the IEEE Oceanic Engineering Society (IEEE OES). The scope of the Journal is the field of interest of the IEEE OES, which encompasses all aspects of science, engineering, and technology that address research, development, and operations pertaining to all bodies of water. This includes the creation of new capabilities and technologies from concept design through prototypes, testing, and operational systems to sense, explore, understand, develop, use, and responsibly manage natural resources.
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