Abstract
Coastal waves are an abundant nonpolluting and renewable energy source. A wave energy converter (WEC) must be designed for efficient and steady operation in highly energetic ocean environments. A direct-drive wave energy conversion (D-DWEC) system with a tubular permanent magnet linear generator (TPMLG) on a wind and solar photovoltaic complementary energy generation platform is proposed to improve the conversion efficiency and reduce the complexity and device volume of WECs. The operating principle of D-DWECs is introduced, and detailed analyses of the proposed D-DWEC’s floater system, wave force characteristics, and conversion efficiency conducted using computational fluid dynamics are presented. A TPMLG with an asymmetric slot structure is designed to increase the output electric power, and detailed analyses of the magnetic field distribution, detent force characteristics, and no-load and load performances conducted using finite element analysis are discussed. The TPMLG with an asymmetric slot, which produces the same power as the TPMLG with a symmetric slot, has one fifth detent force of the latter. An experiment system with a prototype of the TPMLG with a symmetric slot is used to test the simulation results. The experiment and analysis results agree well. Therefore, the proposed D-DWEC fulfills the requirements of WEC systems.
Highlights
Sea wave energy is a nonpolluting, renewable, and abundant ocean energy source
This study presents a direct-drive wave energy conversion (D-DWEC) system that comprises a hollow floater and a tubular permanent magnet linear generator (TPMLG) with an asymmetric slot structure, which are installed on a wind and solar photovoltaic complementary energy generation platform
Detent force is an important parameter in linear generators, and its amplitude affects the stability and conversion efficiency of D-DWEC systems, especially at low speeds
Summary
Sea wave energy is a nonpolluting, renewable, and abundant ocean energy source. Since the. Presented a linear magnetic-geared interior PM generator that aims to achieve high power density, high efficiency, and reduced costs in WECs. wave power density is low, and certain problems are encountered with the generators adopted in present WEC systems, such as high volume, low conversion efficiency, and the need for special mechanical structures to match the energy conversion systems. This study presents a D-DWEC system that comprises a hollow floater and a TPMLG with an asymmetric slot structure, which are installed on a wind and solar photovoltaic complementary energy generation platform. Such complementary platforms produce higher power quality and density than single energy power generation systems. The TPMLG with an asymmetric slot structure can better satisfy the demands for sufficient air-gap flux density, low detent force ripple, low total harmonic distortion of the air gap field, and flexible structure than traditional linear generators can
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