Rotational Speed Control of an OWC Wave Power Plant

1999 ◽  
Vol 121 (2) ◽  
pp. 65-70 ◽  
Author(s):  
P. A. P. Justino ◽  
A. F. de O. Falca˜o
Keyword(s):  
Rotational Speed ◽  
Control Strategies ◽  
Variable Speed ◽  
Power Conditioning ◽  
Wells Turbine ◽  
Electric Generator ◽  
Energy Plant ◽  
Allowable Range ◽  
Conditioning Equipment ◽  
Rotational Speed Control

The paper deals with the control of an oscillating water column wave energy plant, equipped with a Wells turbine driving a variable speed electric generator. The control of the plant is achieved by changing the electric torque through the power conditioning equipment. The control has to meet several requirements: rotational speed allowable range, energy quality, and allowable fluctuations in power delivered to the grid. On the other hand, the turbine is expected to perform efficiently, and so its rotational speed should approximately match the sea conditions (it should be higher in more energetic sea states). Three different control strategies are described. Results of numerical simulations are presented for two of them, and are found to satisfy the prescribed requirements.

scholarly journals Rotational Speed Control Using ANN-Based MPPT for OWC Based on Surface Elevation Measurements

2020 ◽  
Vol 10 (24) ◽  
pp. 8975
Author(s):  
Fares M’zoughi ◽  
Izaskun Garrido ◽  
Aitor J. Garrido ◽  
Manuel De La Sen
Keyword(s):  
Rotational Speed ◽  
Acoustic Doppler Current Profiler ◽  
Speed Control ◽  
Surface Elevation ◽  
Wells Turbine ◽  
Point Tracking ◽  
Current Profiler ◽  
Power Point ◽  
Doubly Fed ◽  
Rotational Speed Control

This paper presents an ANN-based rotational speed control to avoid the stalling behavior in Oscillating Water Columns composed of a Doubly Fed Induction Generator driven by a Wells turbine. This control strategy uses rotational speed reference provided by an ANN-based Maximum Power Point Tracking. The ANN-based MPPT predicts the optimal rotational speed reference from wave amplitude and period. The neural network has been trained and uses wave surface elevation measurements gathered by an acoustic Doppler current profiler. The implemented ANN-based rotational speed control has been tested with two different wave conditions and results prove the effectiveness of avoiding the stall effect which improved the power generation.

scholarly journals A Comparative Analysis of Self-Rectifying Turbines for the Mutriku Oscillating Water Column Energy Plant

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Erlantz Otaola ◽  
Aitor J. Garrido ◽  
Jon Lekube ◽  
Izaskun Garrido
Keyword(s):  
Comparative Analysis ◽  
Power Plant ◽  
Water Column ◽  
Wave Energy ◽  
Control Strategies ◽  
Oscillating Water Column ◽  
Wells Turbine ◽  
Operation Costs ◽  
Energy Plant ◽  
Energy Harnessing

Oscillating Water Column (OWC) based devices are arising as one of the most promising technologies for wave energy harnessing. However, the most widely used turbine comprising its power take-off (PTO) module, the Wells turbine, presents some drawbacks that require special attention. Notwithstanding different control strategies are being followed to overcome these issues; the use of other self-rectifying turbines could directly achieve this goal at the expense of some extra construction, maintenance, and operation costs. However, these newly developed turbines in turn show diverse behaviours that should be compared for each case. This paper aims to analyse this comparison for the Mutriku wave energy power plant.

Heuristic Coupling Design-Optimization between a Variable Speed Generator and a Wind Rotor

2017 ◽  
Vol 32 ◽  
pp. 133-138
Author(s):  
Cherif Khelifi ◽  
Fateh Ferroudji ◽  
Farouk Meguellati ◽  
Khaled Koussa
Keyword(s):  
Wind Turbine ◽  
Output Power ◽  
Wind Turbines ◽  
Electricity Market ◽  
Maximum Output Power ◽  
Vertical Axis ◽  
Mechanical Power ◽  
Maximum Output ◽  
Variable Speed ◽  
Electric Generator

A high emergence of wind energy into the electricity market needs a parallel efficient advance of wind power forecasting models. Determining optimal specific speed and drive-train ratio is crucial to describe, comprehend and optimize the coupling design between a wind turbine-rotor and an electric generator (EG) to capture maximum output power from the wind. The selection of the specific design speed to drive a generator is limited. It varies from (1-4) for vertical axis wind turbines and (6-8) for horizontal axis wind turbines. Typically, the solution is an iterative procedure, for selecting the adequate multiplier ratio giving the output power curve. The latter must be relatively appreciated to inlet and nominal rated wind speeds. However, instead of this tedious and costly method, in the present paper we are developing a novel heuristic coupling approach, which is economical, easy to describe and applicable for all types of variable speed wind turbines (VSWTs). The principle method is based on the fact that the mechanical power needed of the wind turbine (WT) to drive the EG must be permanently closer to the maximum mechanical power generated by the (WT).

Design of Fluid Drive Spindle and Its Rotational Speed Control

2007 ◽  
Author(s):  
Yohichi Nakao ◽  
Masanori Ishikawa
Keyword(s):  
Machine Tool ◽  
Mathematical Models ◽  
Rotational Speed ◽  
Feedback Controller ◽  
Diamond Cutting ◽  
Servo Valve ◽  
Ultra Precision ◽  
Rotational Speed Control ◽  
Rotational Direction ◽  
Cutting Experiments

Water drive spindle has been developed as a spindle for ultra-precision machine tool. Performances of the water drive spindle were evaluated by experiments and simulations. In addition, the spindle was applied to diamond cutting experiments, then, successfully the fine mirrored surfaces were finished. However, rotational direction of the water drive spindle is limited, which is due to the structure of the spindle. Thus, development of water drive spindle that is capable of rotating spindle rotor for both rotational directions is current our objective. In advance of developing the water drive spindle, fluid drive spindle that is similar structure with the water drive spindle, is designed and tested in the present paper. Furthermore, control performances of the fluid drive spindle are studied through simulations. Linearized mathematical models of the fluid drive spindle and servo valve are introduced, then, they are used for the simulations. It is verified that the developed fluid drive spindle is able to rotate for both rotational directions and the spindle speed can be controlled by designed feedback controller.

scholarly journals Empirical Study on the Efficiency of an LPG-Supplied Range Extender for Electric Vehicles

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3528
Author(s):  
Jakub Lasocki ◽  
Artur Kopczyński ◽  
Paweł Krawczyk ◽  
Paweł Roszczyk
Keyword(s):  
Electric Vehicle ◽  
Thermal Efficiency ◽  
Rotational Speed ◽  
Combustion Engine ◽  
Operating Conditions ◽  
Liquefied Petroleum Gas ◽  
Electric Generator ◽  
Range Extender ◽  
Energy Dissipation System ◽  
Carbon Dioxide Co2

A range extender is an auxiliary power unit, usually consisting of an internal combustion engine and an electric generator, which is used to charge a battery of an electric vehicle in order to increase its range. This paper considers a range extender supplied with liquefied petroleum gas (LPG). The aim is to provide detailed data on thermal efficiency, brake specific fuel consumption (BSFC), and unit emission of carbon dioxide (CO2) in a broad spectrum of range extender operating conditions defined by rotational speed and torque. The experimental investigation has been conducted using a laboratory test stand equipped with an energy dissipation system of adjustable resistance. Measurement results, including fuel flow rate, were processed using custom algorithm for generating maps, i.e., two-dimensional dependencies of the considered parameters on the rotational speed and torque. The maps obtained for LPG supply were compared with those for gasoline supply. The results demonstrated feasibility of LPG-supplied range extender. Its BSFC and thermal efficiency were at a comparable level to those obtained for gasoline supply, but with less CO2 emission. The empirical data collected has been adopted in the simulation of extended-range electric vehicle in a driving cycle, showing the potential of utilizing the results of this study.

Sign in / Sign up

Export Citation Format

Share Document