scholarly journals Design And Power Generation Performance Analysis of A Rim-Driven Wave Energy Generator

2021 ◽  
Author(s):  
Zhang Jian ◽  
Yaoyao Ren ◽  
Xiangying Hou ◽  
Hong Zhang
Keyword(s):  
Power Generation ◽  
Performance Analysis ◽  
Kinetic Energy ◽  
Wave Energy ◽  
Rotor Blade ◽  
Energy Conversion Efficiency ◽  
Analytical Models ◽  
Energy Capture ◽  
Power Generation Performance ◽  
Energy Exploitation

Abstract Wave energy exploitation is getting more attention from researchers Many types of devices that can convert wave energy into electricity have been designed. At present, engineers and scientists are researching how to make a simple and efficient wave energy capture device. This paper explored the rim-driven generator. In a rim-driven wave energy generator, the rotor blade could harvest kinetic energy of wave motions. The blade is inside of the generator and the gap between the stator and the rotor is water-filled. This structure could improve the compactness and reliability of the wave energy generator. The paper studied the influence of the arrangement of the blade and the structure of the generator on the performance of the generator. Analytical models were designed to obtain generator’s performance. The result could optimize the design of generator and improve the energy conversion efficiency.

scholarly journals Influence of Buoy Size on Accelerated Wave Power Generation Device

2021 ◽  
Vol 271 ◽  
pp. 01023
Author(s):  
Hu Chen ◽  
Zhifei Ji ◽  
Yusheng Hu ◽  
Min Lin
Keyword(s):  
Power Generation ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Wave Energy ◽  
Energy Conversion Efficiency ◽  
Wave Energy Conversion ◽  
Generation System ◽  
Power Generation System ◽  
Wave Energy Conversion Efficiency ◽  
Power Generation Performance

This paper proposed a pulley-buoy accelerated wave energy linear power generation system, and the feasibility and effectiveness of this system were verified through experimental research. Compared with the traditional wave energy power generation system with three-stage energy conversion links, the pulley-buoy accelerated wave energy linear power generation system omits the intermediate energy transfer and conversion link, and realizes the direct gain of electric energy from the buoy movement caused by wave, and by introducing the pulley combination, the movement speed of the buoy is enlarged, the power generation of the linear power generation system is increased, thereby the wave energy conversion efficiency of the system is improved. Under laboratory conditions, a small-size pulley-buoy accelerated wave energy linear power generation system prototype and a swing-plate wave-making system were built to explore the effects of different buoy sizes on the power generation performance of the system. The test results show that within the research scope of this paper, increasing the size of the buoy can effectively increase the wave energy conversion efficiency of the system and improve the power generation performance of the accelerated wave energy power generation system. The research results in this paper provide useful experience for the practical application and efficient operation of wave energy power generation systems.

Power Generation Performance Analysis of a Hub Dynamo Considering a Magnetic Hysteresis

2017 ◽  
Vol 53 (6) ◽  
pp. 1-5 ◽  
Author(s):  
Noboru Niguchi ◽  
Katsuhiro Hirata ◽  
Shugo Nobuhara ◽  
Kazuya Morita
Keyword(s):  
Power Generation ◽  
Performance Analysis ◽  
Magnetic Hysteresis ◽  
Power Generation Performance

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

2014 ◽  
Vol 494-495 ◽  
pp. 711-716
Author(s):  
Zi Fan Fang ◽  
Zhen Hao Ma ◽  
Jing Fang ◽  
Shu Gao ◽  
Kong De He
Keyword(s):  
Power Generation ◽  
Wave Energy ◽  
Voltage Regulator ◽  
Mechanical Wave ◽  
Energy Capture ◽  
Movement Characteristics ◽  
Speed Up ◽  
Gear Mechanism ◽  
Power Generation Device ◽  
Generator Output

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.

scholarly journals Enhanced power absorption of a point absorber wave energy converter using a tuned inertial mass

2020 ◽  
Author(s):  
Ruriko Haraguchi ◽  
Takehiko Asai
Keyword(s):  
Power Generation ◽  
Energy Absorption ◽  
Wave Energy ◽  
Inertial Mass ◽  
Wave Energy Converter ◽  
Primary System ◽  
Energy Converter ◽  
Power Absorption ◽  
Point Absorber ◽  
Power Generation Performance

A novel point absorber wave energy converter with a tuned inertial mass (TIM), which is capable of significantly increasing the energy absorption and broadening the effective bandwidth, is proposed in this paper. The mechanism of the TIM has originally been introduced in the field of civil engineering as a passive energy absorber for structures subjected to external loadings such as earthquakes. It relies on attaching an additional tuning spring and a rotational inertial mass to the primary system, to improve the energy absorption performance by amplifying the displacement of the damper. Thus, considering typical point absorbers modeled as a mass-spring-dashpot system similar way to civil structures, the application of the TIM to wave energy converters can be expected to have a significant effect. In this paper, numerical investigation on the power generation performance of a point absorber with the TIM is conducted under random sea waves. The amplitude response and power generation performance are compared with the conventional point absorber, considering both non-resonant and resonant buoy cases. It is shown that by properly designing the tuning spring stiffness and generator damping, the rotation of the generator can be amplified compared to the buoy, increasing the power absorption drastically.

Optimization of a Multi-pendulum Wave Energy Converter

2015 ◽  
Vol 9 (1) ◽  
pp. 67-73
Author(s):  
Jun Zhang ◽  
Chenglong Li ◽  
Hongzhou He ◽  
Xiaogang Zang
Keyword(s):  
Wave Energy ◽  
Structure Optimization ◽  
Energy Conversion Efficiency ◽  
Maximum Energy ◽  
Wave Energy Converter ◽  
Structure Parameters ◽  
Energy Converter ◽  
Energy Capture ◽  
Pendulum Wave Energy Converter ◽  
Pendulum Wave

In order to improve the energy capture efficiency of a multi-pendulum wave energy converter, a mathematical model of the pendulum structure has been built. The final structure parameters of the pendulum have been obtained by using genetic algorithm based on the numerical simulation results of the pendulum structure optimization. The results show that under obtained structure parameters the proposed multi-pendulum device can obtain maximum energy conversion efficiency.

Performance Analysis of Single Crystal PMN-PZT Unimorphs for Piezoelectric Energy Harvesting

2008 ◽  
Author(s):  
Alper Erturk ◽  
Onur Bilgen ◽  
Daniel J. Inman
Keyword(s):  
Power Generation ◽  
Performance Analysis ◽  
Energy Harvesting ◽  
Single Crystal ◽  
Power Output ◽  
Piezoelectric Ceramic ◽  
Piezoelectric Energy Harvesting ◽  
Piezoelectric Energy ◽  
Shunt Damping ◽  
Power Generation Performance

This paper presents the performance analysis of the single crystal piezoelectric ceramic PMN-PZT (where PMN stands for lead magnesium niobate and PZT stands for lead zirconate titanate) for piezoelectric energy harvesting. Unimorph cantilevers using PMN-PZT layers with Al (aluminum) and SS (stainless steel) substrates are tested under base excitation for a wide range of load resistance (from 10 ohms to 2.2 Mohms). Electrical power generation performance of the unimorphs using PMN-PZT is compared against that of the unimorphs using the conventional piezoelectric ceramic PZT-5H with Al and SS substrates. For both substrates, it is observed that the power density (power output per device volume) and the specific power (power output per device mass) results of the unimorphs using PMN-PZT are about two orders of magnitude larger than those of the unimorphs using PZT-5H. Outstanding power generation performance of the unimorphs with PMN-PZT is associated with stronger resistive shunt damping effect compared to unimorphs with PZT-5H. In addition to the experimental analyses and comparisons, power generation and shunt damping results of a single crystal unimorph are successfully predicted by using a distributed parameter electromechanical model. Results show that single crystal PMN-PZT is a very strong interface for piezoelectric energy harvesting and shunt damping. However, the improved power generation and shunt damping performance of PMN-PZT comes with reduced robustness due to the brittle nature of the single crystalline structure.

scholarly journals Advanced Maximum Power Control Algorithm Based on a Hydraulic System for Floating Wave Energy Converters

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1712
Author(s):  
Chan Roh ◽  
Yoon-Jin Ha ◽  
Seungh-Ho Shin ◽  
Kyong-Hwan Kim ◽  
Ji-Yong Park
Keyword(s):  
Power Generation ◽  
Wave Energy ◽  
Control Algorithm ◽  
Maximum Power ◽  
Torque Control ◽  
Damping Coefficient ◽  
Wave Excitation ◽  
Wave Energy Converters ◽  
Power Generation Performance ◽  
Energy Converters

An integrated analysis is required to evaluate the performance of control algorithms used in power take-off (PTO) systems for floating wave energy converters (FWECs). However, research on PTO systems based on the existing hydraulic device has mainly focused on the input power generation performance rather than on obtaining maximum power through hydraulic device-based electrical load control. The power generation performance is analyzed based on the control variables of the existing torque control algorithm (TCA); however, the amount of power generation for each control variable changes significantly based on the cycle of wave excitation moments. This paper proposes a control algorithm to obtain the maximum power by modeling a hydraulic-device-based integrated FWEC. It also proposes a TCA that can obtain the maximum power regardless of the period of wave excitation moment. The proposed TCA continuously monitors the power generation output and changes the PTO damping coefficient in the direction in which the power generation output can be increased. The proposed TCA increased the output power generation by up to 18% compared to each PTO damping coefficient of the conventional TCA. Thus, the proposed method results in higher power generation regardless of the wave excitation moment cycle and performs better than the existing torque control algorithm.

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