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Integrating Deep Offshore Wind with Pumped Hydro Storage in a Central Mediterranean Archipelago’s Electricity Generation System

  • Robert N. Farrugia
  • Tonio Sant
  • Cedric Caruana
Conference paper

Abstract

This investigation starts off with a hypothetical deep sea offshore wind turbine array consisting of twenty 5 MW NREL reference wind turbines for offshore deployment. Measure-correlate-predict techniques are utilised to transpose long-term measured wind data from a reference site located at an elevation of just under 220 m above mean sea level to a short-term 80 m wind-monitoring station close to sea level at a coastal location. The extrapolated long-term 80 m level wind speed and direction time series are then used as climatological inputs to a computational fluid dynamics software program that is used to generate wind resources over the extents of the hypothetical 100 MW offshore wind farm zone. Time series of wind speed, wind direction and power production are generated for the array covering a number of years, with the period being analysed here covering the years 2007–2011. Meanwhile, electrical load data on an hourly basis are also assessed in order to enable a wind power/pumped hydroelectric storage to electrical load interfacing exercise. The implications of combining a pumped hydroelectric storage system into the electrical system are assessed. The studies have shown that if the output from the wind farm is set to meet a fixed load threshold on a monthly basis, the surplus wind power can be used to pump water into the storage system. The stored potential energy can then be converted back to electricity by means of a water turbine in instances when wind power falls short of the set threshold. Such a system will decouple the renewable energy (RE) supply from the load and, with careful balancing of the stored hydraulic energy against the energy required to reach the threshold, supply a steady contribution to the load over a predetermined period of time. Such a steady contribution is highly desirable in an electrical system as a variable input coming from large-scale wind farms could cause grid imbalance, induce fluctuations and possibly compromise stability. The work has shown that the contribution of a wind farm coupled to a pumped hydroelectric system could contribute primarily to the base load whilst also allowing for green energy generation, facilitate the integration of RE technologies and help achieve part of Malta’s RE targets.

Keywords

Island Deep offshore Wind Pumped hydroelectric storage 

Notes

Acknowledgements

The WindPRO software was funded by the project: Setting up of Mechanical Engineering Computer Modelling and Simulation Laboratory, part-financed by the European Regional Development Fund (ERDF) - Investing in Competitiveness for a Better Quality of Life, Malta 2007–2013.

References

  1. 1.
    NSO (2014) Census of Population and Housing 2011. National Statistics Office, Valletta, MaltaGoogle Scholar
  2. 2.
    Enemalta Corporation—News and Alerts—Gas Project. http://www.enemalta.com.mt/index.aspx?cat=3&art=218
  3. 3.
    Enemalta Corporation—Major Projects—Interconnector. http://www.enemalta.com.mt/index.aspx?cat=20&art=177
  4. 4.
    Farrugia RN, Fsadni M, Mallia EA, Yousif C (2006) The renewable energy potential of Malta. In: Proceedings of world renewable energy congress IX, Florence, ItalyGoogle Scholar
  5. 5.
    Farrugia RN, Fsadni M, Mallia EA, Yousif C (2006) Barriers and incentives for the widespread application of renewable energy in Malta. In: Proceedings of world renewable energy congress IX, Florence, Italy Google Scholar
  6. 6.
    Riolo A (2006) Establishing environmentally compatible wind energy potential in Europe—Malta case study. In: EEA expert meeting: “Establishing environmental compatible wind energy potential in Europe”, EEA, Copenhagen, Denmark, 9 November 2006Google Scholar
  7. 7.
    MacDonald M (2005) Strategy for Renewable Electricity Exploitation in Malta. vol. 1. Renewable energy target. Brighton, UK/Malta Resources Authority, Triq Aldo Moro, Marsa, MaltaGoogle Scholar
  8. 8.
    MacDonald M (2009) Feasibility study for increasing renewable energy credentials. Brighton, UK/Malta Resources Authority, Triq Aldo Moro, Marsa, MaltaGoogle Scholar
  9. 9.
    Farrugia RN, Deidun A, Debono G, Mallia EA, Sant T (2010) The potential and constraints of wind farm development at nearshore sites in the Maltese islands. Wind Eng 34:51–63CrossRefGoogle Scholar
  10. 10.
    Fsadni M, Mallia EA (2011) The potential of wind power generation at Gozo North-offshore. In: ISES Solar World Congress, Kassel, GermanyGoogle Scholar
  11. 11.
    Jonkman J, Butterfield S, Musial W, Scott G (2009) Definition of a 5-MW reference wind turbine for offshore system development. In: National Renewable Energy Laboratory (NREL), Technical report NREL/TP-500-38060, February 2009Google Scholar
  12. 12.
    Aquilina M, Sant T, Farrugia RN (2014) Cost modelling of floating wind farms with upscaled rotors in Maltese waters. In: Proceedings of sustainable energy 2014. In: The ISE annual conference, Qawra, MaltaGoogle Scholar
  13. 13.
    Malta’s National Renewable Energy Action Plan as Required by Article 4(2) of Directive 2009/28/EC, 2010. http://ec.europa.eu/energy/renewables/action_plan_en.htm
  14. 14.
    Farrugia RN, Sant T (2011) Wied Rini II—a five year wind survey at Malta. Wind Eng 35:419–432CrossRefGoogle Scholar
  15. 15.
    Malta Resources Authority, Triq Aldo Moro, Marsa, MaltaGoogle Scholar
  16. 16.
    WindPRO™ Ver. 2.7 (2008) EMD, Aalborg, DenmarkGoogle Scholar
  17. 17.
    WindSim™ Ver. 5.01.1 (1997–2010) WindSim A/S, Tønsberg, NorwayGoogle Scholar
  18. 18.
    Galdies C (2011) The climate of Malta—statistics, trends and analysis, 1951–2010. National Statistics Office, Valletta, MaltaGoogle Scholar
  19. 19.
    Farrugia RN, Sant T (2013) Mediterranean inshore wind resources: combining MCPs and CFD for marine resources quantification. Wind Eng 37:243–256CrossRefGoogle Scholar
  20. 20.
    Moretti PM, Jones BW (1982) Analysis method for non-schedulable generation in electrical systems. Solar Energy 28:499–508CrossRefGoogle Scholar
  21. 21.
    Wildi T (2006) Electrical machines, drives and power systems. Sperika Enterprises Ltd., Pearson Education Inc., New Jersey, USAGoogle Scholar
  22. 22.
    Lindley D (2010) The energy storage problem. Nature 463:18CrossRefGoogle Scholar
  23. 23.
    Tuohy A, O’Malley M (2011) Pumped storage in systems with very high wind penetration. Energy Policy 39:1965–1974CrossRefGoogle Scholar
  24. 24.
    Anagnostopoulos JS, Papantonis DE (2008) Simulation and size optimization of a pumped–storage power plant for the recovery of wind-farms rejected energy. Renew Energy 33:1685–1694CrossRefGoogle Scholar
  25. 25.
    Nyamdash B, Denny E, O’Malley M (2010) The viability of balancing wind generation with large scale energy storage. Energy Policy 38:7200–7208CrossRefGoogle Scholar
  26. 26.
    Buhagiar D, Sant T (2013) Analysis of a stand-alone hydraulic offshore wind turbine coupled to a pumped water storage facility. In: Proceedings of sustainable energy 2013: the ISE annual conference, Qawra, MaltaGoogle Scholar
  27. 27.
    Borg L (2013) Ta’ Zuta energy storage—bulk energy storage of 872 GWh—2,829 GWh YearlyGoogle Scholar
  28. 28.
    Evans A, Strezov V, Evans TJ (2012) Assessment of utility energy storage options for increased renewable energy penetration. Renew Sustain Energy Rev 16:4141–4147CrossRefGoogle Scholar
  29. 29.
    Fsadni M, Mallia EA (2006) The interaction of wind power generation with electricity demand in the context of a small grid. Renew Energy 31:811–819CrossRefGoogle Scholar
  30. 30.
    EasyFitXL Ver. 5.5, MathWave Technologies. 3 Dec 2012Google Scholar

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Authors and Affiliations

  • Robert N. Farrugia
    • 1
    • 2
  • Tonio Sant
    • 1
    • 2
  • Cedric Caruana
    • 3
  1. 1.Institute for Sustainable Energy, University of MaltaMarsaxlokkMalta
  2. 2.Department of Mechanical EngineeringUniversity of MaltaMsidaMalta
  3. 3.Department of Industrial Electrical Power ConversionUniversity of MaltaMsidaMalta

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