Knowledge structure and research progress in wind power generation (WPG) from 2005 to 2020 using CiteSpace based scientometric analysis

Tidal current energy has received extensive attention from both academia and industry in the past decade due to its high power density and strong predictability. Besides Europe and the United States, China has also made tremendous efforts in tidal current energy development, as this abundant ocean renewable resource is expected to provide consistent and clean power for highly-populated coastal cities or remote islands. To evaluate the tidal current resource potential in China, both national assessments and regional investigations have been conducted with different methods and resolutions. However, these evaluation results have not been systematically collected, which are poorly informed to researchers, developers, and investors. At the same time, the conducted assessments sometimes show discrepancies, indicating the necessity of analysing data uncertainty and improving data quality. Under the circumstances, this work presents a review of tidal current resource assessment studies in China, and most existing evaluations for tidal current energy hotspots have been included, classified and compared. Particularly, these regions of interest are further categorised with their exploitability, based on not only theoretical energy reserve estimation, but also local conditions of bathymetry, transportation, policy, etc. According to the assessment results, Zhoushan Archipelago has been considered the most suitable area for large-scale tidal current energy development in China, and the waters nearby Chengshan Cape and Qiongzhou Strait are also with great potential. Furthermore, assessment result uncertainties are analysed, and suggestions on scientific research, technology innovation, and business investment are also proposed for future China tidal current energy development.

A review of tidal current energy resource assessment in China

As an abundant, clean, and predictable source of renewable energy, tidal current energy provides a cost-effective alternative to fossil fuels. Tidal current energy harvesting technologies are still at their early stages of development. Even some advanced demonstration projects with full-scale tidal current energy converters (TCECs) still face considerable technical barriers, and their environmental impacts are unclear. This study presents a comprehensive overview of the state-of-the-art of tidal current energy harvesting schemes and life cycle assessment (LCA) studies of TCECs. By reviewing the state-of-the-art of research and development efforts of tidal current energy harvesting technologies, key advancements required for their successful commercialization at the utility scale in the tidal current energy industry are identified. Detailed LCA studies of TCECs are presented to indicate their energy consumption and environmental impacts. Additionally, some comprehensive comments of development of TCECs and LCA are presented, which can be used to guide decision making towards more sustainable energy practices. 

Tidal current energy harvesting technologies: A review of current status and life cycle assessment

Influence of C groove on suppressing vortex and cavitation for a NACA0009 hydrofoil with tip clearance in tidal energy

Design, modeling and experiments of a novel biaxial-pendulum vibration energy harvester

Design and test of a 600-kW horizontal-axis tidal current turbine

Integrated design and implementation of 120-kW horizontal-axis tidal current energy conversion system

Indirect load measurements for large floating horizontal-axis tidal current turbines

Load reduction for two-bladed horizontal-axis tidal current turbines based on individual pitch control

Wave energy is one of the most important potential sustainable energy resources. To enhance the performance of the pendulum hydraulic wave energy converter (WEC) system in various wave conditions, this article proposes a digital controlled hydraulic cylinders group to replace the single traditional hydraulic cylinder in a hydraulic power take-off (PTO) system based on the concept of previous study. The cylinders group, whose structure is designed with high extendability, consists of several pairs of subsidiary cylinders. The extraction energy maximizing for pendulum WEC is theoretically analyzed in the frequency domain based on a linear wave assumption, which indicates demand for damping regulation. The proposed cylinders group is able to provide variable damping for the PTO system by changing its working area. So as to demonstrate the better performance of the proposed cylinders group compared with a single traditional hydraulic cylinder, a simulation in AMESim software and a fundamental semiphysical test have been carried out. Both results illustrated that the WEC was endowed with high performance by using cylinders group in various wave conditions. In addition, a transmission efficiency test indicated that the application of the cylinders group did not cause much more extra energy loss during the transmission process compared with the single traditional cylinder. The further study of cylinders group with more subsidiary cylinders and the control strategy remains to be conducted.

The Application of the Digital Controlled Hydraulic Cylinders Group in Pendulum Wave Energy

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