Determining required valve performance for discrete control of PTO cylinders for wave energy

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Abstrakt

Within wave energy a large challenge remains in designing a Power Take-Off (PTO) system capable of converting the slow oscillations induced by waves into electricity. Fluid power is an essential part of most PTO-concepts. To implement an efficient control of the load force produced by a cylinder on a floating body, throttle-less force control by discrete variation of the effective cylinder area has been investigated and found feasible for the Wavestar wave energy concept. However, the feasibility study assumes adequate valve performance, such that only the compression loss remains. This paper investigates the required valve performance to achieve this energy efficient operation, while meeting basic dynamic requirements. The components making up the total energy loss during shifting is identified by analytically expressing the losses from the governing differential equations. From the analysis a framework for evaluating the adequacy of a valve’s response is established, and the analysis shows the results may be normalised for a wider range of systems. Finally, the framework is successfully applied to the Wavestar converter.
OriginalsprogEngelsk
TitelProceedings of ASME Symposium on Fluid Power and Motion Control, FPMC 2012
RedaktørerNigel Johnston, Andrew R. Plummer
UdgivelsesstedGreat Britain
ForlagAmerican Society of Mechanical Engineers
Publikationsdato2012
Sider565-578
ISBN (Trykt)978-0-086197-187-9
ISBN (Elektronisk)978-0-086197-188-6
StatusUdgivet - 2012
BegivenhedASME 2012 6th International Conference on Energy Sustainability & 10th Fuel Cell Science, Engineering and Technology Conference - San Diego, USA
Varighed: 23 jul. 201226 jul. 2012

Konference

KonferenceASME 2012 6th International Conference on Energy Sustainability & 10th Fuel Cell Science, Engineering and Technology Conference
LandUSA
BySan Diego
Periode23/07/201226/07/2012

Emneord

  • Hydraulics
  • Fluid Power
  • PTO
  • Wave energy
  • Discrete Displacement
  • Secondary Controlled System
  • Wavestar

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