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The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference
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The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference

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  • 1. Feasibility Study of Pumped Hydro Energy Storage for Ramea Wind-Diesel Hybrid Power System Sheikh Mominul Islam, EIT, M.Eng. Email: mominul511@gmail.com Newfoundland Electrical and Computer Engineering Conference November 4th, 2010 St. John’s, Newfoundland
  • 2. Outline  Introduction  Motivation  Sizing  Dynamic simulation  Conclusion
  • 3. Introduction:  Isolated southern island of Newfoundland which was first incorporated to the province in 1951.  It has population of 674.  Nearest community is Burgeo which is about 20kM away by ferry service.  Average fuel consumption is 18,000L/week in summer and 22,000L/week in winter.  Electricity selling price is 0.1495/unit. Over view of Ramea
  • 4. Introduction: Over view of Ramea Electrical system  2775kW diesel plant, Six 65kW wind turbines and three 100kW newly installed wind turbines  The average load is 550kW  312.5kW fuel cell system under construction  200kW load for dumping excess energy produced by the system  30kVAR fixed capacitor bank for each 65kW wind turbine for supplying reactive power demand.
  • 5. Motivations: Analysis of existing Ramea wind-diesel-hydrogen system:  HOMER is used for analyzing the existing wind-diesel-hydrogen system.  Average wind speed is 6.08m/s at 10m height  Maximum wind speed during winter is 21.6m/s  Daily load profile varies from 350kW to 610kW  Maximum load goes to 1100kW during winter
  • 6. Motivations Analysis of existing Ramea wind-diesel-hydrogen system:  Excess electricity from the wind turbines is converted to hydrogen using an electrolyser.  Hydrogen is compressed and stored in three large tanks.  Stored hydrogen is used to generate electricity when needed  Expected renewable fraction is 37% with the contribution of 1% from Hydrogen system  Cost of Energy is 0.248$/kWhr  Hydrogen generator will run 702hrs/yr
  • 7. Sizing Analysis of proposed Ramea wind-diesel-pumped hydro system:  Overall efficiency of the battery was reduced to 70% to represent a pumped hydro energy storage system.  A 250kW converter is considered between AC and DC bus  Renewable energy fraction is considered 37%
  • 8. Sizing HOMER simulation result of Ramea wind-diesel-pumped hydro system:  Battery bank (consisting of Trojan T-105 batteries) should have 500 batteries.  Cost of Energy is 0.218$/kWhr  Diesel required 783, 529L/yr
  • 9. Sizing Electrical performance of Ramea wind-diesel-pumped hydro system:  Total energy required 4,281,096 kWh/year and 37% of that will be met by the wind energy  Almost only one diesel generator is running at a time  Diesel required 783, 529L/yr
  • 10. Expected energy in and out of battery system: Sizing  Battery will be most used in July and August while it will be least used in May.  Maximum power output from battery storage is 147kW during the month of April.
  • 11. Calculations: The hybrid system required 500 Torjan T-105 batteries (each 1350Whr). So the potential energy stored in the upper reservoir should be. Potential Energy = mgh, → 1350 × 3600 × 500 = mgh = (volume * desnsity)*g*h Volume, V = 100081.9 50036001350   h For a head h = 63m, required reservoir size will be V = 3932m3 For area of 2000m2, required reservoir height will be 2m
  • 12. Calculations: Possible maximum daily average power , 147kW ~ 150kW gHQP  For, H = Gross head in m (63m), g = 9.81 m/s2 and η = Hydro turbine efficiency = 70%. The flow rate, Q = 0.347 m3/s
  • 13. For the Ramea site the expected flow rate is 0.347 m3/s and head is 63m therefore the best selection is a Pelton or Turgo type turbine.
  • 14. Dynamic simulation of grid connected PHS:  The pump is considered as a 150kW centrifugal pump with induction machine  The hydro turbine is considered as 150kW unit with a synchronous machine coupled to the system bus.  Community load is considered as a constant load  The system was simulated for 24s  During off peak hour the pump will be operating for pumping water to upper reservoir  During peak demand the hydro turbine will be operating.
  • 15. Dynamic simulation of grid connected PHS: SIMULINK representation of Diesel-wind-hydro hybrid power system in Ramea
  • 16. o vwt v t atw V z TtmV Tdt dV VVV 5.10 ),( 1 ,  Wind field equation: Vw = the wind speed Va= Average wind speed Vt= Turbulent component of wind speed mw(t)= Random white noise Z = Turbine height V0= Maiden wind speed Dynamic simulation of grid connected PHS:
  • 17. Dynamic simulation of grid connected PHS Expected power changes in a transient condition in the Ramea Hybrid power system Hydro pump is operating Hydro turbine is operating
  • 18. Dynamic simulation of grid connected PHS: Expected transients in the Ramea hybrid power system Hydro turbine is operating Hydro pump is operating
  • 19. Conclusions:  Diesel fuel saved by 94,782L per year  Cost of energy reduced by 0.03$/kWh  All excess electricity will be stored in hydro storage  Available sea water can be used  63m height is available for water head.  No extension of power line is required as Man of War hill is near to the existing system  Voltage and frequency variation are within limit
  • 20. Future recommendation:  Battery system can be replaced by actual pumped hydro system.  Soft starter can be used for reducing system transients.  Variable speed hydro pumped storage can be considered.  Variable load can be considered.
  • 21. Acknowledgement:  M. Tariq Iqbal  Nalcor energy (Newfoundland Hydro)  The Leslie Harris Centre of Regional Policy and Development, MUN
  • 22. Thank you For your attention and presence Question / Comments

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