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A Study on Wave Energy Conversion Using Direct Linear Generator
Phan Cong Binh,Dinh Quang Truong,Kyoung Kwan Ahn 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Ocean wave has made a significant contribution in renewable energy resource. Since, lots of researches relating to wave energy generation (WEG) have been carried out. Among them, an electrical power take-off system (PTO) which can be used to combine wave extracting device and an electrical generating system is especially paid attention to. In this paper, a floating-buoy wave energy converter (WEC) using a linear generator is proposed and studied. The mathematical model is then derived in order to investigate the WEC operation. In addition, the principle to improve the WEC performance based on a so-called adaptive ballast control technique is also presented. Numerical simulations using MATLAB/Simulink have been performed in the time domains to evaluate the energy generation efficiency of this device. The WEG of using the suggested WEC is finally compared with that of using a conventional WEC based linear generator.
Phan Cong Binh,Kyoung Kwan Ahn 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
This paper investigate the performance of a wave energy converter using Dielectric electro active polymer (DEAP). Firstly, the model of conventional DEAP generator is presented and validated by a simple test rig. Then, an antagonistic DEAP generator so-called energy capture unit (ECU) consists of two DEAP in antagonistic connection mode is analyzed and modeled. In order to increase the output energy, a new design of WEC is then developed with array of ECU. Moreover, the hydrodynamic forces are calculated under regular wave conditions by using the linear potential wave theory. Then, a complete analytical model of the proposed WECs using multiple ECU under hydrodynamic behavior is then obtained to investigate the performance of energy conversion. Finally, stretch ratio known as an important factor to efficiency and output power is investigated under the influence of the supplementary mass. The resonance behavior of the WEC with a typical wave frequency can also be tuned by controlling the inertia supplementary to increase the degree of utilization of the device. The efficiency of wave energy converter can reach 20% thanks to additional mass.
Binh, Phan Cong,Nam, Doan Ngoc Chi,Ahn, Kyoung Kwan Korean Society for Precision Engineering 2015 International Journal of Precision Engineering and Vol.16 No.8
This paper proposes a design and modeling of an innovative wave energy converter using Dielectric electro active polymer (DEAP). Firstly, an accurate model of conventional DEAP generator is investigated and validated under a specific range of ocean waves. Then, a structure design of an antagonistic DEAP generator so-called energy capture unit (ECU), which consists of two DEAPs in antagonistic connection mode to increase harvested energy efficiency, is modeled and validated by experimental data. A new design of WECs is then developed with array of ECUs to increase the output energy. In addition, by using the linear potential wave theory, the hydrodynamic forces are calculated under regular wave conditions. Consequently, a complete analytical model of the proposed WECs using multiple ECUs under hydrodynamic behavior is then obtained to investigate the performance of energy conversion. Finally, based on the developed analytical model, the stretch ratio known as an important factor to efficiency and output power is investigated under the influence of the floating buoy's mass. Then, the resonance behavior of the WECs with a typical wave frequency can be tuned by optimizing the floating's mass to increase the degree of utilization of the device. The simulation results indicate that the efficiency of wave energy converter can be up to 25% thanks to resonance behavior.
Performance Optimization of Dielectric Electro Active Polymers in Wave Energy Converter Application
Binh, Phan Cong,Ahn, Kyoung Kwan Korean Society for Precision Engineering 2016 International Journal of Precision Engineering and Vol.17 No.9
This paper presents a design, modeling and control of a novel wave energy converter (WEC) using Dielectric electro active polymer (DEAP). Application of DEAP in WEC has attracted a lot of works due to development of renewable energy and increasing of human energy demand. However, various challenges of the WEC using DEAP must be overcome before going to realistic application. Firstly, stretch ratio has significant influence on energy conversion efficiency of DEAP. It cannot exceed the limitation value due to mechanical or electrical breakdown, whereas small stretch ratio reduces the energy conversion efficiency significant. Secondly, WEC has to be controlled to maximize the absorbed energy. Therefore, this study employs an innovative device which can adjust the inertia of the floating buoy. A variable inertia hydraulic flywheel is attached on the main thrust shaft to control stretch ratio based on change in the hydrodynamic behavior of the system. A proportional-integral-derivative (PID) controller is designed to optimize stretch ratio under different regular waves. Consequently, the overall energy conversion efficiency of the proposed WEC can reach up to 25%.
Analysis, design and experiment investigation of a novel wave energy converter
Binh, Phan Cong,Tri, Nguyen Minh,Dung, Dang Tri,Ahn, Kyoung Kwan,Kim, Sung-Jae,Koo, Weoncheol THE INSTITUTION OF ENGINEERING AND TECHNOLOGY 2016 IET GENERATION TRANSMISSION AND DISTRIBUTION Vol.10 No.2
<P>This study presents an innovative design for a wave energy converter (WEC). The system is based on a novel mechanical power take-off (PTO) device that can absorb wave energy by converting the bidirectional motion of an ocean wave into the one-way rotation of an electric generator. First, the PTO mechanism and configuration are described in detail. A coupled mechanical and hydrodynamic time-domain simulation of a hemispherical floating buoy connected to a bidirectional gearbox and torque generation device under regular waves were modelled in MATLAB((R))/Simulink((R)). The hydrodynamic forces acting on the semi-submerged floating buoy are calculated by employing linear potential wave theory. The friction behaviour in the PTO system is modelled by using Brian Armstrong's method. Next, an average wave energy and absorbed energy calculation was applied to investigate the conversion efficiency of the WEC. Finally, the experimental setup is carried out in a water tank under various conditions to evaluate the performance of WEC and validate the modelling. The results indicate that high-energy conversion efficiency of generating electricity from waves is approachable, thanks to the high efficiency of the proposed device.</P>
Modeling and Experimental Investigation on Dielectric Electro-Active Polymer Generator
Binh, Phan Cong,Nam, Doan Ngoc Chi,Ahn, Kyoung Kwan Korean Society for Precision Engineering 2015 International Journal of Precision Engineering and Vol.16 No.5
Dielectric electro-active polymers (DEAP) have been attracted for the energy harvesting application due to its low cost, lightweight and flexible deformation capability. This paper presents a validated model and experimental investigation on energy conversion of a typical DEAP generator. Firstly, a dynamics model based on Mooney-Rivlin proposition is developed to describe the strain - force relationship of DEAP material. Then, the effect of charging voltages and energy conversion are also taken into account. In addition, identification processes are done separately for stretching and relaxing strokes using an adaptive PSO scheme to find best material parameters for the model. This makes the model be available to describe the sinusoidal strain forms in practical conditions. The validated model is then employed in investigating input mechanical energy, return energy and conversion energy for the DEAP generator. Experimental evaluations show that the developed model can describe the behavior of DEAP material accurately. Finally, analyses based on the energy conversion demonstrate the abilities of DEAP material as wave energy converter.
Tri Dung Dang,Cong Binh Phan,Kyoung Kwan AHN 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.3
Nowadays, wave energy plays an important role in renewable energy resource. In over 30 years, several researches in wave energy converter system (WEC) have been deployed and carried out. This paper proposes a new mechanism to achieve the resonant behavior of a point absorber floating buoy type of WEC system with mechanical power take-off. The original WEC system uses the bidirectional gearbox to convert up and down motion of the wave in heave mode to one-way rotation. By designing the array of hydraulic springs, the equivalent stiffness of the float can be reduced to close to the relatively low frequency of the wave. Then the buoy is at near resonance with the wave, also increase the power capture bandwidth and the performance of the operating system. In this paper, the specification of the system is proposed and studied. The working principle is analyzed. The mathematical model is then derived to investigate the operation. Experiments are performed to validate the simulation results based on mathematical model. Numerical simulation using Matlab/Simulink has been done to evaluate the effectiveness of the new control stiffness mechanism.