Wave Energy Power Generation Research Articles

Parameter Adjustment Strategy and Experimental Development of Hydraulic System for Wave Energy Power Generation

This paper develops the dynamic response of a hydrolic-transmission system of wave-power devices under random wave conditions. Through theoretical calculation and experiment analysis, the mathematical model of the hydrolic-transmission system was built to make clear which parameters are related to electric-energy output. The working characteristics of the main parameters are developed through the designed experimental platform. The charging pressure of the accumulator, which affects the rigidity of the hydrolic-transmission system, is analyzed. The throttle valve opening and symmetrical electric loads, which affect the stability and efficiency of the electric energy output, are analyzed. Thus, the energy output curve under different parameter regulations is drawn. Through the orthogonal experimental method, the law curve is further modified, the design principle of hydraulic system parameters under the sea level condition is established, and the optimal design scheme and regulation strategy to the hydraulic conversion system of the power generation device is obtained, to solve the problem that the multiparameter coupling cannot be adjusted quickly and effectively. The energy regulation response mechanism of the hydrolic-transmission system in the wave energy power-generation system is proved.

Tidal waves Based Power Generation

Wave energy power generation is a clean energy mechanism. Wave energy assures to be renewable source of energy with zero emission. In this experimental outcome of a built in wave generator with some additional features are reported.

Research on the Sea Surface Vertical Spar Buoy Power Installation Driving by Double-Sided Rack

Based on the analysis of engineering examples of current domestics and foreign wave energy conversion device and wave energy power generation principle, in this paper, a buoy wave power device was proposed and the principles were explored. The device mainly uses mechanical transmission devices for wave energy conversion to mechanical power. In the paper, the overall design of the buoy wave power device was carried, and directional reversing gearbox was developed, it can convert the vertical reciprocating movement of the wave to unidirectional rotation. According to Froude-Krylov hypothesis method, the paper analyses the perpendicular wave force of the vertical cylinder and the action of the ups and downs of displacement under the force. On the basis of the above work, the overall design of the device was completed.

A Review of Wave Energy Extraction Technology

The current research on the utilization of wave energy has not formed a globally recognized technologically optimal wave energy power generation technology. The various types of wave energy power generation devices have different power generation principles and structural forms. Wave energy has the characteristics of wide distribution and high energy density, but it is also the most unstable type of ocean energy. Compared with other energy sources, wave energy has the characteristics of high energy density, and it is technically easy to realize the miniaturization of equipment, which contributes to the development of ocean resources. This article will mainly introduce current mainstream wave energy technologies, and explore their working principles and analyse their development trends.

Research on Efficiency of a Wave Energy Conversion System

The oceans are rich in wave energy that is green energy, and the wave energy are now being used to generate electricity on a massive scale. It can also be used as a single generator for beacon, buoy or underwater vehicle. Micro small wave energy power generation device is a kind of wave energy power generation devices, main characteristic is mobility is good, and can be directly assembled on various kinds of equipment for the power supply, with good prospects for development. The research object of the paper is a new adaptive reversing wave energy generating device belongs to micro-sized wave energy generating device. Using the upper and lower absorber blade groups, the low speed and large torque wave energy can be converted into electric energy which can be used for load and lithium battery charging.

Fast Energy Storage Systems Comparison in Terms of Energy Efficiency for a Specific Application

One of the key parameters to properly and accurately assess an energy storage system is the energy efficiency, which has a direct impact on the system performance and an indirect impact in its cost. In this paper, a methodology for comparing double-layer capacitors (EDLC) and kinetic energy storage systems (KESS) in terms of energy efficiency is proposed. This methodology, based on accurate loss models, takes real operating cycles into account, so a realistic result is obtained for each particular case. An accurate study of the losses of both technologies is accomplished during the paper, getting a complete model for EDLCs and KESSs, and obtaining efficiency maps for the whole range of operation points. Some conclusions about the convenience to use one or the other alternative and the best way to operate them are presented. In addition, a specific study case related to a wave energy power generation plant has been carried out in this paper, defining a methodology to select the energy storage requirements, calculating the round-trip efficiency and getting some recommendations related to the most appropriate operation strategy to take the most advantage of the energy storage system.

Influence of installation deviation on dynamic performance of synchronous magnetic coupling

To improve dynamic characteristics of synchronous magnetic coupling, this paper mainly analyzed the influence of the installation deviation on the synchronous magnetic coupling’s dynamic performance used in the horizontal axis wave energy power generation device. Dynamic characteristics equations based on Lagrange equation are built in the paper to analyze the dynamic characteristic of synchronous magnetic coupling. The radial deviation, the angle deviation and the center-of-mass deviation are considered in the equation. The influence of those installation deviations on the synchronous magnetic coupling performance is analyzed based on the mathematical model. The results show that the rise time, the overshoot, the peak time, the adjusting time and the oscillation of the synchronous magnetic coupling are almost not affected by those installation deviations.

Ocean Energy Comprehensive Utilization System of Water‐electricity Cogeneration

Ocean energy is one of the renewable energy sources. Ocean thermal energy is the most abundant in marine energy, so it has a good development prospect. At present, the main way to use ocean energy is power generation. However, it has disadvantages: low efficiency and high energy consumption. In view of the above shortcomings, this study puts forward a new type of ocean energy comprehensive utilisation system of water–electricity cogeneration. The system is based on the ocean thermal energy conversion: wave energy power generation and solar pond are integrated in the system. The basic principle and working process were analysed, and the energy consumption and the product of the system were calculated. As shown in the calculation results, it is effective to reduce energy consumption and improve the system efficiency. The research of this study has valuable reference for the development of ocean energy in the future.

Pumped‐storage power generation system based on wave energy

Ocean wave energy is a new type of pollution-free renewable energy, and there are many kinds of wave energy utilising equipments designed recently. The magnitude of wave energy has the characteristics of time variation, so that the output of most wave power generation devices may not be directly integrated into the grid. In order to simplify the structure of the wave energy power generation system, reduce the design and manufacturing costs and improve the stability of the output to satisfy the grid-connection control requirements of wave energy power generation, a wave energy conversion device is designed, which is convenient to maintenance and replacement, and a pumped-storage power generation system based on this device is proposed. In this study, the design of wave energy pumped-storage power generation system is explained in detail. The working condition of the device under different sea conditions is simulated, and the operating characteristics and reasonable parameters of the system are deduced. Theoretical analysis and simulation results can provide theoretical basis for the design of wave energy pumped-storage power generation device and provide reference for engineering application.

Experimental and Simulative Study on Accumulator Function in The Process of Wave Energy Conversion

Abstract In this paper, a floating-buoy wave energy converter using hydrostatic transmission system is studied. The entire work progress of wave energy power generation device is introduced, and the hydraulic transmission principles are emphasized through the simulation to verify the feasibility of design principle of hydraulic transmission system. The mathematical model of the accumulator is established and applied in the AMEsim simulation. The simulation results show that the accumulator plays an important role in the wave power hydraulic transmission system and that the correct configuration of accumulator parameters can improve the rapidity and stability of the system work. Experimental results are compared with the simulation results to validate the correctness of the simulation results. This would provide a valuable reference to the optimal design of wave power generation.

Design and experimental research of jack-up wave energy power generation device

In order to solve the problem of energy shortage and focus on the development of wave energy, a jack-up platform is used as the carrier, and a new type of wave energy power generation device is designed. Compared with other power generation devices, this new type of jack-up wave energy power generation device owns the advantage of wind and wave resistance, is continuous, highly efficient, stable, and strongly adaptable. By means of combination of theoretical analysis and physical test, the feasibility of the device implementation of wave power is explored. The results showed that the jack-up wave energy power generation device can normally work in the sea state, which verified the feasibility of the device. This device has achieved wave power efficiency by more than 15% of the technical indicators of the project and the desired effect. In general, the jack-up wave energy power generation device has achieved breakthrough in many aspects, and the overall technology has reached the leading domestic level.

Progress in the Development and Utilization of Wave Energy Technology Abroad

Ocean wave energy belongs to ocean surface energy- the kinetic energy and potential energy. It is a kind of clean, non-polluting, renewable new energy which has the advantage of high energy density and wide distribution. This article describes the working principle and application of several major wave energy devices (oscillating water column, tilting, raft, canard, oscillating buoy) and elaborates the wave energy technology trend. Based on the existing research and development, the paper studies the new technology, the new or modified sources in wave energy technology. Besides, this paper reveals three key issues of wave energy development and utilization technology (power generation efficiency and stability, survival and reliability, cost) and puts forward the corresponding solving methods. At last, it summarizes that the development trend of wave energy power generation technology is in the direction of high efficiency, high reliabilityand low cost. The research trend is to develop new principles or improved wave power generation technology, and consider other integrated energy power generation technology and comprehensive utilization, energy application and development from the nearshore application to the deep sea application.

A Costal Wave Energy Power Station Equipment

This paper introduced a coastal wave energy power generation and its unique dual channel structure, in which two–way coastal current was transformed into single direction rotation of the impeller. Also according to coastal wave energy characteristics, the paper analyzed relationship between inshore sea water kinetic energy and the wave amplitude away from the coast. In addition, the water velocity and flow area of equipment through power generation equipment are studied.

Research and Development of Multi Section Floating Mechanical Wave Energy Power Generation Device

In order to study the principle of wave power generation, a multi section floating mechanical wave energy power generation device and a rectifier voltage regulator circuit are designed. The device consists of multi cylinder buoys, direction changing and speed-up mechanism, generator, rectifier voltage regulator circuit and other components. According to the certain regulation of wave movement, the structure and parameters of the wave energy capture device are designed; based on the movement characteristics of wave energy capture device, the direction changing and speed-up mechanism is designed, including crank-rocker mechanism and gear mechanism. The rectifier voltage regulator circuit is designed by the law of generator output. The experiment research shows that the efficiency of wave energy power generation device is up to 45.8% under the condition of prescribed test wave.

Design and Analysis of Water Turbine that Used for Wave Energy Power Generation

In view of the current global energy shortage crisis, ocean wave energy is development potential renewable energy, which is gaining more and more attention. This paper put forward use the water turbine absorb wave energy, and then generate electricity. It focus on the compose and generate mechanism of water turbine, and design structure of water turbine, and combine ocean wave theory and the flow control equation to analysis, through the method of machine design and FLUENT simulation, finally proved the water turbine had a high efficiency and has good application prospect.

Stability Analysis of a Wave-Energy Conversion System Containing a Grid-Connected Induction Generator Driven by a Wells Turbine

This paper presents the dynamic-stability analyzed results of both dynamic simulations and steady-state performance of a wave-energy power generation system containing a grid-connected induction generator (IG) driven by a Wells turbine. The stator windings of the IG are connected directly to a power grid through a step-up transformer and a transmission line. A d-q axis equivalent-circuit model is employed to establish the IG, the transmission line, and the grid to derive the complete dynamic equations of the studied system under three-phase balanced loading conditions. A frequency-domain approach based on eigenvalue analysis and a time-domain scheme based on nonlinear-model simulations are both carried out to systematically determine the dynamic stability of the studied system under various operating conditions. It can be concluded from the simulation results that the studied wave-energy power generation system subject to different disturbance conditions can maintain stable operation.

Design analysis of 0.6m Impulse turbine with fixed guide vanes for wave energy power conversion

SYNOPSIS Wave energy is the most abundant source of renewable energy in the world. For the last two decades, engineers have been investigating and defining different methods for power extraction from wave motion. Two different turbines, namely the Wells turbine and Impulse turbine with guide vanes, are commonly in use around the world for wave energy power generation. The overall purpose of this research is to perform a complete design analysis of an Impulse turbine with fixed guide vanes for wave energy power generation. The ultimate goal is to optimise the performance of the turbine under actual sea conditions. This research is divided into two phases. First, to design and manufacture a 0.6m diameter Impulse turbine with fixed guide vanes with a new hub to tip ratio; then to validate this design experimentally using Computational Fluid Dynamics (CFD) and to compare the performance characteristics obtained experimentally with those obtained from CFD. The second phase is to optimise turbine blade and guide vane geometry based on theoretical, experimental and CFD analysis and finally, to manufacture and test a 2nd generation turbine, based on this optimum design. This paper presents the work done during the first phase of the research. It reports the design of a 0.6m diameter Impulse turbine with fixed guide vanes, manufacture of turbine blades using a unique method of Rapid Prototyping on a Fused Decomposition Modelling (FDM) machine, experimental analysis of the turbine and comparison of the CFD work with experiment.

Design and performance analysis of impulse turbine for a wave energy power plant

Wave energy is the most abundant source of renewable energy in the World. For the last two decades, engineers have been investigating and defining different methods for power extraction from wave motion. Two different turbines, namely Wells turbine and impulse turbine with guide vanes, are most commonly used around the world for wave energy power generation. The ultimate goal is to optimize the performance of the turbine under actual sea conditions. The total research effort has several strands; there is the manufacture and experimental testing of new turbines using the Wave Energy Research Team's (WERT) 0.6 m turbine test rig, the theoretical and computational analysis of the present impulse turbine using a commercial software package and finally the prediction of the performance of the turbine in a representative wave power device under real sea conditions using numerical simulation. Also, the WERT 0.6 m turbine test rig was upgraded with a data acquisition and control system to test the turbine in the laboratory under real sea conditions using the computer control system. As a result, it is proven experimentally and numerically that the turbine efficiency has been raised by 7% by reducing the hub-to-tip ratio from 0.7 to 0.6. Effect of tip clearance on performance of the turbine has been studied numerically and designed tip clearance ratio of 1% has been validated. From the numerical simulation studies, it is computed that the mean conversion efficiency is reduced around 5% and 4.58% due to compressible flow and damping effects inside OWC device. Copyright © 2005 John Wiley & Sons, Ltd.