Experimental Study on Performance Assessment of Hydraulic Power Take-off System in Centipede Wave Energy Converter Considering Caspian Sea Wave Characteristics

Document Type : Original Article

Authors

Sea-Based Energy Research Group, Babol Noshirvani University of Technology, Babol, Iran

Abstract

Considering the characteristics of the Caspian Sea waves, using a centipede wave energy converter might lead to satisfactory performance. The present paper introduced a pilot wave energy converter (WEC) called IRWEC2. Moreover, the performance of the hydraulic power take-off (PTO) system developed for the WEC was assessed experimentally in the wave tank of Babol Noshirvani University of Technology (BNUT). The Simcenter Amesim software was used so as to design the hydraulic PTO system and to initially evaluate the system performance. For two separate buoys were used, different series and parallel configurations were employed for the separate hydraulic cylinders connected to each buoy to achieve the optimum performance of the PTO system. The characteristics of input wave, resistant load, and flow control valve opening were defined as the most important parameters affecting the converter performance. Accordingly, the maximum value of generator output was obtained based on the certain values of these parameters. To validate the processes defined, the simulation results obtained through the Simcenter Amesim software were compared to the experimental ones and a good agreement was found. According to the results, the maximum power of the PTO system was 46 watts (for laboratory scale), which is related to the parallel configuration. In this case, the efficiency of the PTO system was 23%. Moreover, the output of the generator increased by about 12% compared to the case where only one buoy was used.

Keywords

Main Subjects

References

  1. Tafazzoli, S., Shafaghat, R. and Alamian, R., "Numerical investigation on the multi-body hydrodynamic interactions under Caspian Sea environmental conditions", Ocean Engineering, Vol. 232, (2021), 109048, DOI: 10.1016/j.oceaneng.2021.109048.
  2. Tri, N. M., Binh, P. C. and Ahn, K. K., "Power take-off system based on continuously variable transmission configuration for wave energy converter", International Journal of Precision Engineering and Manufacturing-Green Technology, Vol. 5, (2018), 89-101, DOI: 10.1007/s40684-018-0010-0.
  3. Yazdi, H., Shafaghat, R. and Alamian, R., "Experimental Assessment of a Fixed On-Shore Oscillating Water Column Device: Case Study on Oman Sea", International Journal of Engineering, Transactions C: Aspects, Vol. 33, (2020), 494-504, DOI: 10.5829/ije.2020.33.03c.14.
  4. Henderson, R., "Design, simulation, and testing of a novel hydraulic power take-off system for the Pelamis wave energy converter", Renewable Energy, Vol. 31, (2006), 271-283, DOI: 10.1016/j.renene.2005.08.021.
  5. Waters, R., Stålberg, M., Danielsson, O., Svensson, O., Gustafsson, S., Strömstedt, E., Eriksson, M., Sundberg, J. and Leijon, M., "Experimental results from sea trials of an offshore wave energy system", Applied Physics Letters, Vol. 90, (2007), 034105, DOI: 10.1063/1.2432168.
  6. Hansen, R. H., Design and control of the powertake-off system for a wave energy converter with multiple absorbers. Videnbasen for Aalborg UniversitetVBN, Aalborg Universitet, The Faculty of Engineering and Science. 2013: Department of Energy Technology, Aalborg University. 266.
  7. López, I., Andreu, J., Ceballos, S., De Alegría, I. M. and Kortabarria, I., "Review of wave energy technologies and the necessary power-equipment", Renewable and Sustainable Energy Reviews, Vol. 27, (2013), 413-434, DOI: 10.1016/j.rser.2013.07.009.
  8. Sarlak, H., Seif, M. S. and Abbaspour, M., "Experimental investigation of offshore wave buoy performance", Journal of Marine Engineering, Vol. 6, (2010).
  9. Alamian, R., Shafaghat, R. and Safaei, M. R., "Multi-objective optimization of a pitch point absorber wave energy converter", Water, Vol. 11, (2019), 969, DOI: 10.3390/w11050969.
  10. Babarit, A., Guglielmi, M. and Clément, A. H., "Declutching control of a wave energy converter", Ocean Engineering, Vol. 36, (2009), 1015-1024, DOI: 10.1016/j.oceaneng.2009.05.006.
  11. Hansen, R. H., Andersen, T. O. and Perdersen, H. C., Analysis of discrete pressure level systems for wave energy converters, in Proceedings of 2011 International Conference on Fluid Power and Mechatronics. 2011, IEEE. 552-558.
  12. Cargo, C. J., Plummer, A. R., Hillis, A. J. and Schlotter, M., "Determination of optimal parameters for a hydraulic power take-off unit of a wave energy converter in regular waves", Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, Vol. 226, (2012), 98-111, DOI: 10.1177/0957650911407818.
  13. Bayani, R., Farhadi, M., Shafaghat, R. and Alamian, R., "Experimental Evaluation of IRWEC1, a Novel Offshore Wave Energy Converter", International Journal of Engineering, Transactions C: Aspects, Vol. 29, (2016), 1292-1299. doi: 10.5829/idosi.ije.2016.29.09c.15
  14. Hassan, F. A., Mahmoud, M. and Almohammed, O. A., "Analysis of the Generated Output Energy by Different Types of Wind Turbines", Journal of Human, Earth, and Future, Vol. 1, (2020), 181-187.
  15. Coiro, D. P., Troise, G., Calise, G. and Bizzarrini, N., "Wave energy conversion through a point pivoted absorber: Numerical and experimental tests on a scaled model", Renewable Energy, Vol. 87, (2016), 317-325, DOI: 10.1016/j.renene.2015.10.003.
  16. Alamian, R., Shafaghat, R. and Ghasemi, M., "Experimental evaluation of attenuator WEC in a laboratory wave tank", Journal of Marine Engineering, Vol. 14, (2019), 1-9, DOI: 20.1001.1.17357608.1397.14.28.8.7.
  17. Liu, C., Yang, Q. and Bao, G., "Influence of hydraulic power take-off unit parameters on power capture ability of a two-raft-type wave energy converter", Ocean Engineering, Vol. 150, (2018), 69-80, DOI: 10.1016/j.oceaneng.2017.12.063.
  18. Kim, S.-J., Koo, W. and Shin, M.-J. Numerical study on multi-buoy-type wave energy converter platform with hydraulic PTO system. in Oceans 2017-Aberdeen. 2017. IEEE.DOI: 10.1109/OCEANSE.2017.8084920.
  19. Tian, H., Zhou, Z. and Sui, Y., "Modeling and Validation of an Electrohydraulic Power Take-Off System for a Portable Wave Energy Convertor with Compressed Energy Storage", Energies, Vol. 12, (2019), 3378, DOI: 10.3390/en12173378.
  20. Aghanezhad, M., Shafaghat, R. and Alamian, R., "Experimental Performance Evaluation of a Hydraulic PTO System for Centipede Wave Energy Converter", International Journal of Coastal and Offshore Engineering, Vol. 3, (2020), 35-46, DOI: 10.29252/ijcoe.3.4.35.
  21. Alamian, R., Shafaghat, R., Shadloo, M. S., Bayani, R. and Amouei, A. H., "An empirical evaluation of the sea depth effects for various wave characteristics on the performance of a point absorber wave energy converter", Ocean Engineering, Vol. 137, (2017), 13-21, DOI: 10.1016/j.oceaneng.2017.03.036.
  22. HYDRAULIC MOTORS MM. https://www.dynahydraulics.com/wp-content/uploads/2017/03/1-MM-1.pdf
  23. Hydraulic Motors, Variable Displacement, in HY30-8223/UK, P. Hannifin, Editor. 2014: sweden.
  24. Needle Valves with and without Reverse Flow Check Direct-Acting, HYDAC, Editor. p. 1-4.
  25. TGET-260-I-100W-100R (AFPMG Three Phase inner rotor). Available from: http://www.china-topgrand.com/product_new/?tid=74&type=85.
International Journal of Engineering
Volume 35, Issue 5
TRANSACTIONS B: Applications
May 2022
Pages 883-899

Files

Cited by

Share

How to cite

Statistics