Rule extraction and optimization of fuzzy controllers in maximizing the captured power of wave energy converters

2021 ◽  
pp. 014233122110555
Author(s):  
Mohamad Jalali ◽  
Reihaneh Kardehi Moghaddam
Keyword(s):  
Fuzzy Control ◽  
Wave Energy ◽  
Control Process ◽  
Electrical Energy ◽  
Sea Waves ◽  
Mechanical Parts ◽  
Wave Energy Converters ◽  
Controller Performance ◽  
Energy Absorbers ◽  
First Time

In recent years, the extraction of electrical energy from sea waves has been considered by researchers due to its advantages such as renewability and high amount of extracted energy, and in recent research studies, several scientific solutions have been presented to maximize the energy obtained from these converters. One of the major problems that is ignored in most articles is the existence of several uncertainties that occur as an uncertain parameter in the proposed models for various types of wave energy absorbers, including mechanical parts erosion, limescale deposition and algae on buoyant which causes it to change weight. Ignoring these uncertainties will reduce the accuracy of the controller performance. Therefore, in this paper, for the first time, a fuzzy control process with optimized extracted rules and parameters is applied to control the damper and spring coefficients of the mechanical model describing a power takeoff system, which not only uses fuzzy control properties but also covers uncertainties. Optimizing the number of rules and structure of membership functions provides acceptable controllable accuracy and speed as it is mentioned in simulation results.

Analysis of Electromagnetic Force for the Linear Generator Wave Energy Converters

2015 ◽  
Vol 764-765 ◽  
pp. 418-422
Author(s):  
Peng Huang ◽  
Da Xiao Gao ◽  
Zhong Qiang Zheng ◽  
Xiang Biao Kong ◽  
Zong Yu Chang
Keyword(s):  
Environmental Pollution ◽  
Wave Energy ◽  
Electromagnetic Force ◽  
New Technology ◽  
Electrical Energy ◽  
Small Probability ◽  
Linear Generator ◽  
Wave Energy Converters ◽  
Scientists And Engineers ◽  
First Time

In recent decades environmental pollution and energy crisis have become a challenging task for the scientists and engineers who lead them to innovate new technology and solve this problem by reducing environmental pollution and by exploiting the new source of energy. In this regard wave energy is appeared to be a suitable outcome in order to resolve the current issues. This paper studies and summarizes that the linear generators are considered a device which is used to convert wave energy into electrical energy efficiently. It is the first time to calculate the electromagnetic force by considering the linear generator and at the same time simulated by Ansoft Maxwell software; by providing calculated value and simulated value, it is also verified that the calculated result is accurate with a small probability error as compared to software calculated value.

scholarly journals HF Radars for Wave Energy Resource Assessment Offshore NW Spain

2021 ◽  
Vol 13 (11) ◽  
pp. 2070
Author(s):  
Ana Basañez ◽  
Vicente Pérez-Muñuzuri
Keyword(s):  
Wave Energy ◽  
Numerical Models ◽  
Wave Spectrum ◽  
Energy Resource ◽  
Electrical Energy ◽  
Resource Assessment ◽  
Electricity Production ◽  
Statistical Validation ◽  
Wave Energy Converters ◽  
Energy Converters

Wave energy resource assessment is crucial for the development of the marine renewable industry. High-frequency radars (HF radars) have been demonstrated to be a useful wave measuring tool. Therefore, in this work, we evaluated the accuracy of two CODAR Seasonde HF radars for describing the wave energy resource of two offshore areas in the west Galician coast, Spain (Vilán and Silleiro capes). The resulting wave characterization was used to estimate the electricity production of two wave energy converters. Results were validated against wave data from two buoys and two numerical models (SIMAR, (Marine Simulation) and WaveWatch III). The statistical validation revealed that the radar of Silleiro cape significantly overestimates the wave power, mainly due to a large overestimation of the wave energy period. The effect of the radars’ data loss during low wave energy periods on the mean wave energy is partially compensated with the overestimation of wave height and energy period. The theoretical electrical energy production of the wave energy converters was also affected by these differences. Energy period estimation was found to be highly conditioned to the unimodal interpretation of the wave spectrum, and it is expected that new releases of the radar software will be able to characterize different sea states independently.

Tadpole: A Design Problem in the Mechanics of the Use of Sea Wave Energy

1996 ◽  
Vol 210 (4) ◽  
pp. 273-277 ◽  
Author(s):  
M J French
Keyword(s):  
Wave Energy ◽  
Special Interest ◽  
Reaction Force ◽  
Electrical Energy ◽  
Wave Forces ◽  
Sea Waves ◽  
Small Machine ◽  
Clear Insight ◽  
Insight Into ◽  
Sea Wave

A study is made of a device for obtaining electrical energy from sea waves, in which the problem of providing a reaction against the wave forces is met by a combination of a pendulum and gyroscopes. The mechanics is developed in a logical manner which gives a clear insight into the function, the pendulum providing the reaction force, which leaves an unbalanced moment to be countered by the gyroscopes, which also constitute the power take-off. The result is a relatively small machine with no external moving parts. The treatment requires no understanding of wave hydrodynamics. It is felt this paper may be of special interest as a design study, in which the relation between the mechanics and the development of the concept is peculiarly cogent.

Hydrocavitation piezoelectric ocean wave energy harvesting

2021 ◽  
pp. 1-10
Author(s):  
Francisco Arias ◽  
Salvador De Las Heras
Keyword(s):  
Wave Energy ◽  
Low Cost ◽  
Electrical Energy ◽  
Ocean Waves ◽  
Ocean Wave ◽  
Mechanical Parts ◽  
Energy Harvesters ◽  
Ocean Wave Energy ◽  
Piezoelectric Layers ◽  
Local Pressures

Abstract The possibility to convert the ocean wave energy into electrical energy by piezoelectric layers has excited the imagination of ocean wave energy conversion designers for decades owing to its relative robustness (no mechanical parts are needed), the capability to cover large areas and its relative low cost. Unfortunately, the very poor efficiency featured by piezoelectric layers in application of ocean waves has prevented its application even as energy harvester. Here, the possibility to induce hydrocavitation and then working with more higher local pressures for substantial efficiency enhancement is discussed. Utilizing a simplified geometrical and physical model and the linear and potential theory, a first theoretical estimation for the energy enhancement driven by hydrocavitation was calculated. It was found that the power could be enhanced several orders of magnitude which, although still rather low, however, the enhanced electric outputs can be used now as energy harvesters. Additional R&D is encouraged in order to explore the possibilities to harness hydrocavitation to enhance piezoelectric converters.

Exploiting of Ocean Wave Energy

2012 ◽  
Vol 622-623 ◽  
pp. 1143-1146
Author(s):  
Cheng Shao ◽  
Xao Yu Yuan
Keyword(s):  
Wave Energy ◽  
Electrical Energy ◽  
Energy Carrier ◽  
Ocean Wave ◽  
Sea Waves ◽  
Energy Research ◽  
Power Sources ◽  
Renewable Power ◽  
Ocean Wave Energy ◽  
Scientists And Engineers

Sea waves are a very promising energy carrier among renewable power sources, and so many devices to convert wave energy into electrical energy have been invented. This paper discussed the fundamentals of ocean wave energy, summarized the wave energy research being conducted. And the purpose is to take refers to scientists and engineers in this area.

scholarly journals NUMERICAL MODELING OF WAVE INTERACTION WITH A NON-CONVENTIONAL BREAKWATER FOR WAVE ENERGY CONVERSION

2018 ◽  
pp. 64
Author(s):  
Enrico Di Lauro ◽  
Maria Maza ◽  
Javier L. Lara ◽  
Inigo J. Losada ◽  
Diego Vicinanza
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Wave Interaction ◽  
Electrical Energy ◽  
Water Levels ◽  
Electricity Production ◽  
Coastal Structures ◽  
Wave Energy Converters ◽  
Important Benefit ◽  
Low Head

The hybrid non-conventional breakwaters are innovative coastal structures, which have as a primary function the coastal and harbours protection, but with the important benefit of electricity production, due to their combination with Wave Energy Converters. The most recent example of a non-conventional breakwater is called OBREC, standing for Overtopping Breakwater for Energy Conversion (Vicinanza et al., 2014). The device consists of a traditional rubble mound breakwater, in which the seaward armour layer in the upper part is replaced with a frontal sloping ramp and a reservoir. The structure is designed to capture and gather the water that overtops the crest ramp. The potential energy of the water stored in the reservoir is converted into kinetic energy and then into electrical energy by flowing through low head hydraulic turbines coupled with generators, exploiting the different water levels between the reservoir and the sea level.

Research Note: Hydrodynamic Basis of Wave-Energy Converters of Channel Form

1977 ◽  
Vol 19 (2) ◽  
pp. 90-92 ◽  
Author(s):  
M. J. French
Keyword(s):  
Wave Energy ◽  
Deep Sea ◽  
Research Note ◽  
Sea Waves ◽  
Wave Direction ◽  
Harmonic Motion ◽  
Wave Energy Converters ◽  
Channel Form ◽  
Flexible Walls ◽  
The Waves

A study is made of a train of ideal deep-sea waves, 2 b in width, entering a channel of the same width whose flexible walls move horizontally and normally to the wave direction in simple harmonic motion so as to extract energy from the waves.

scholarly journals Switching sequences for non-predictive declutching control of wave energy converters

2020 ◽  
Vol 53 (2) ◽  
pp. 12295-12300
Author(s):  
Paula B. Garcia-Rosa ◽  
Olav B. Fosso ◽  
Marta Molinas
Keyword(s):  
Wave Energy ◽  
Wave Energy Converters ◽  
Energy Converters
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