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A Study on Modeling and Experiment of a Wave Energy Converter Using Mechanical Coupled with Hydraulic Power Take-Off

Cong Binh Phan, Quang Tri Truong, Le Dang Hai Nguyen, Nguyen Long Nhut-Phi

Journal of Ecological Engineering

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2023

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Vol. 24, nr 8

12--24

EN

The article’s proposal refers to a new concept of wave energy converter (WEC), in which the power take-off (PTO) is combined with the mechanical and hydrostatic transmission. Here, the wave energy is absorbed by turning the two-way movement of an incident wave into the one-way rotation of a hydraulic pump which drives a high-pressure (HP) hydraulic circuit. Electricity is generated using a rotating generator which is driven by an HP hydraulic circuit. First, the coupled PTO mechanism is presented to describe the working principle of the proposed WEC. Next, a mathematical model of the buoy connects generator system is shown to analyze the equipment’s performance subjected regular waves. And then, by using the theory of linear potential wave, the hydrodynamic forces acting on the semi-submerged floating buoy and an analytical model of the mechanical transmission coupled with the hydraulic transmission are modeled to investigate the motion of the rotary generator. An experimental Setup is performed to verify the analytical model. Based on the validated model, a structural optimization is calculated to bring the system to resonance condition. Then, a dry test is implemented to analyze the system’s performance. Some optimum parameters are determined and applied to the analytical model, which sends the signal to drive the actuator. As a result, the absorbed efficiency is increased significantly.

2

Optimal configurations of wave energy converter arrays with a floating body

Zhang W., Liu H., Zhang X., Zhang L., Ashraf M. A.

Polish Maritime Research

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2016

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S 1

71--77

EN

An array of floating point-absorbing wave energy converters (WECs) is usually employed for extracting efficiently ocean wave energy. For deep water environment, it is more feasible and convenient to connect the absorbers array with a floating body, such as a semi-submersible bottom-moored disk, whose function is to act as the virtual seabed. In the present work, an array of identical floating symmetrically distributed cylinders in a coaxial moored disk as a wave energy device is proposed The power take-off (PTO) system in the wave energy device is assumed to be composed of a linear/nonlinear damper activated by the buoys heaving motion. Hydrodynamic analysis of the examined floating system is implemented in frequency domain. Hydrodynamic interferences between the oscillating bodies are accounted for in the corresponding coupled equations. The array layouts under the constraint of the disk, incidence wave directions, separating distance between the absorbers and the PTO damping are considered to optimize this kind of WECs. Numerical results with regular waves are presented and discussed for the axisymmetric system utilizing heave mode with these interaction factors, in terms of a specific numbers of cylinders and expected power production.

3

Współpraca PKE S.A. z Operatorem Sieci Przesyłowej. Nowoczesne formy handlu energią elektryczną i ciepłem

Niemiec D.

Energetyka

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2010

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nr 8

511-512

PL

Omówiono ogólne warunki współpracy jednostek wytwórczych PKE z Krajowym Systemem Elektroenergetycznych ze szczególnym uwzględnieniem warunków pracy części systemu zlokalizowanej na Śląsku. Omówiono także rolę działów handlowych PKE i współpracę części handlowej PKE ze służbami technicznymi zarówno PKE, jak i PSE Operator.

EN

The article presents the general conditions of cooperation between PKE generation units and the Polish Power System, with a particular emphasis on the operation of the system part located in Silesia. The article also discussed the part played by PKE trade departments and their cooperation with technical services belonging both to PKE and PSE Operator.