Heave motion and electric power of multiple cylinders for wave energy converter considering the controlling force

2016 ◽  
Author(s):  
Qiao Li ◽  
Syu Kuwada ◽  
Motohiko Murai
Keyword(s):  
Electric Power ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Heave Motion

Design and Efficiency Analysis of a Mechanical Wave Energy Converter

2011 ◽  
Author(s):  
Srinivasan Chandrasekaran ◽  
Harender
Keyword(s):  
Wave Energy ◽  
Energy Resource ◽  
Water Levels ◽  
Wave Energy Converter ◽  
Small Displacement ◽  
Energy Converter ◽  
Mechanical Wave ◽  
Wave Impact ◽  
Heave Motion ◽  
Gear Rack

Wave energy is the most promising natural energy resource that is gaining momentum in the recent years. Successful attempts are made by several researchers to harness wave energy by heave, surge and sway motion of the devices; however no successful commercial model is launched till date leaving this domain as a research potential. Among the proposed technologies, point absorbers are found to be commercially viable to a greater extent primarily due to its simplicity. The present study discusses a new mechanical wave energy converter (MWEC) using point absorber as a wave energy capturing device. Heave motion of a floating buoy due to incident wave field is harnessed to produce power. The conversion takes place in four different stages namely: i) motion of a gear rack, attached to floating buoy results in heave motion; ii) this vertical reciprocating motion is converted to oscillatory rotation of a shaft by a rack and pinion arrangement; iii) alternative rotary motion is converted in to continuous unidirectional rotation using a unidirectional chain assembly; and iv) unidirectional rotation is converted in to other usable energy form. MWEC employs numerous operating advantages over other systems such as: (i) the rack and pinion gear arrangement enabling the buoy to float in line to the changing water levels automatically. (ii) use of RPM multiplier enables rotation of generator shaft at high RPM even for small displacement of float; (iii) the free wheel sprockets of unidirectional chain assembly enable the gear rack to produce a positive upward stroke and a positive downward stroke for every passing wave impact. Further, rpm multiplier shall be easily adjusted to rotate the generator at desired rpm while the whole operation shall be shut down on emergency. The paper presents a detailed analysis of the mechanical system to arrive at the efficiency of the developed MWEC. Based on the studies conducted, it is seen that the overall efficiency of the MWEC is about 19% while maintaining maximum possible efficiency of the mechanical systems involved in the design.

scholarly journals Improving electric power generation of a standalone wave energy converter via optimal electric load control

Energy ◽  
2020 ◽  
Vol 211 ◽  
pp. 118945
Author(s):  
LiGuo Wang ◽  
MaoFeng Lin ◽  
Elisabetta Tedeschi ◽  
Jens Engström ◽  
Jan Isberg
Keyword(s):  
Power Generation ◽  
Electric Power ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Load Control ◽  
Electric Load ◽  
Energy Converter ◽  
Electric Power Generation

scholarly journals WAVE ENERGY CONVERTER WITH WAVE ABSORBING CONTROL

2018 ◽  
pp. 61
Author(s):  
Takashi Kawaguchi ◽  
Kunio Nakano ◽  
Shogo Miyajima ◽  
Taro Arikawa
Keyword(s):  
Electric Power ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Tank Wall ◽  
Energy Converter ◽  
Reflected Waves ◽  
Wave Sensors ◽  
Incident Waves ◽  
The Waves

The wave absorbing control using wave sensors was theorized and developed by the authors, about 30 years ago. It was originally for absorbing wavemakers for tank tests in laboratories. This control enables wavemakers to generate the desired incident waves while absorbing undesirable reflected waves from the tank wall. When waves are absorbed by the wavemaker, the energy of the waves are also absorbed, that is, the energy is regenerated to electric power with the wavemaker drivemotor. According to this theory, in case that certain waves are generated by an oscillating body, these waves can be absorbed by the same body. Therefore, we can design a wave energy converter as a kind of absorbing wavemaker.

Sign in / Sign up

Export Citation Format

Share Document