Recent progress in blue energy harvesting for powering distributed sensors in ocean

https://digitalcommons.mtu.edu/cgi/viewcontent.cgi?article=1767&context=etdr

Optimal control of wave energy converters

The level of awareness about ocean wave energy as a viable source of useful energy has been increasing recently. Different concepts and methods have been suggested by many researchers to harvest ocean wave energy. This paper reviews and compares the efficiencies and power performance of different wave energy converters. The types of analyses used in deriving the reported efficiencies are identified, and the stage of the power conversion processes at which the efficiencies were determined is also identified. In order to find a common way to compare the efficiencies of different technologies, the hydrodynamic efficiency in relation to the characteristic width of the wave energy converters and the wave resource potential are chosen in this paper. The results show that the oscillating body systems have the highest ratio in terms of the efficiency per characteristic width, and overtopping devices have the lowest. In addition, with better understanding of the devices’ dynamics, the efficiencies of the newer oscillating water column and body systems would increase as the potential wave energy level increases, which shows that those newer designs could be suitable for more potential locations with large variations in wave energy potentials. At last, discussion about the cost of ocean wave energy is presented as well.

https://www.mdpi.com/1996-1073/12/22/4329/pdf

Review on Power Performance and Efficiency of Wave Energy Converters

Even though ocean waves around the world are known to contain high and dense amounts of energy, wave energy harvesters are still not as mature as other forms of renewable energy harvesting devices, especially when it comes to commercialization, mass production, and grid integration, but with the recent studies and optimizations, the point absorber wave energy harvester might be a potential candidate to stand out as the best solution to harvest energy from highly energetic locations around the world’s oceans. This paper presents an extensive literature review on point absorber wave energy harvesters and covers their recent theoretical and experimental development. The paper focuses on three main parts: One-body point absorbers, two-body point absorbers, and power take-offs. This review showcases the high amount of work being done to push point absorbers towards technological maturity to eventually kick off commercialization and mass production. It should also provide a good background on the recent status of point absorber development for researchers in the field.

Point Absorber Wave Energy Harvesters: A Review of Recent Developments

As a renewable energy with immense development potential, ocean wave energy has abundant storage. The utilizations of wave energy technology to exploit wave energy resources have broad application prospects and an important realistic meaning. The researchers worldwide have designed many wave energy converters (WEC) with varied and structures based on different concepts. In this paper, the principle of wave energy power generation technology is reviewed and analyzed from basic structure and power take-off (PTO). Some typical WEC and multi-degree of freedom WEC (MDWEC) and their realization are introduced. The analytic hierarchy process (AHP) is employed to construct a comprehensive multi-index model and evaluate the present WEC from five perspectives: energy capture, technology cost economic, reliability, environmental friendliness and adaptability. Results show that in the field of wave energy utilization and development, the MDWEC has a good comprehensive performance and a wide application range. Qualitative and quantitative methods are adopted to find the optimal WEC technical scheme based on the review and analysis of technology principles of wave energy power generation and realization of devices, which can be used for the development of WEC.

Ocean wave energy converters: Technical principle, device realization, and performance evaluation

https://digital.library.adelaide.edu.au/dspace/bitstream/2440/106269/3/hdl_106269.pdf

Performance comparison of the floating and fully submerged quasi-point absorber wave energy converters

Feasibility study of the three-tether axisymmetric wave energy converter

Renewable forms of energy are becoming increasingly important to consider, as the global energy demand continues to grow. Wave energy is one of these widely available forms, but it is largely unexploited. A common design for a wave energy converter is called a point absorber or buoy. The buoy typically floats on the surface or just below the surface of the water, and captures energy from the movement of the waves. It can use the motion of the waves to drive a pump to generate electricity and to create potable water. Since a single buoy can only capture a limited amount of energy, large-scale wave energy production necessitates the deployment of buoys in large numbers called arrays. However, the efficiency of arrays of buoys is affected by highly complex intra-buoy interactions. The contributions of this article are two-fold. First, we present an approximation of the buoy interactions model that results in a 350-fold computational speed-up to enable the use inside of iterative optimisation algorithms, Second, we study arrays of fully submerged three-tether buoys, with and without shared mooring points.

Fast and Effective Optimisation of Arrays of Submerged Wave Energy Converters

https://digital.library.adelaide.edu.au/dspace/bitstream/2440/98332/3/hdl_98332.pdf

Nataliia Y. Sergiienko

Papers

Performance comparison of the floating and fully submerged quasi-point absorber wave energy converters

Feasibility study of the three-tether axisymmetric wave energy converter

Fast and Effective Optimisation of Arrays of Submerged Wave Energy Converters

An optimal arrangement of mooring lines for the three-tether submerged point-absorbing wave energy converter

Stochastic analysis of nonlinear wave energy converters via statistical linearization