Feasibility Study of Pumped Hydro Energy Storage
for Ramea Wind-Diesel Hybrid Power System
Sheikh Mominul Islam, EIT, M.En...
Outline
 Introduction
 Motivation
 Sizing
 Dynamic simulation
 Conclusion
Introduction:
 Isolated southern island of Newfoundland which was first incorporated to the province in
1951.
 It has po...
Introduction:
Over view of Ramea Electrical system
 2775kW diesel plant, Six 65kW wind
turbines and three 100kW newly
ins...
Motivations:
Analysis of existing Ramea wind-diesel-hydrogen system:
 HOMER is used for analyzing the existing wind-diese...
Motivations
Analysis of existing Ramea wind-diesel-hydrogen system:
 Excess electricity from the wind turbines is convert...
Sizing
Analysis of proposed Ramea wind-diesel-pumped hydro system:
 Overall efficiency of the battery was reduced to 70% ...
Sizing
HOMER simulation result of Ramea wind-diesel-pumped hydro system:
 Battery bank (consisting of Trojan T-105 batter...
Sizing
Electrical performance of Ramea wind-diesel-pumped hydro system:
 Total energy required 4,281,096 kWh/year and 37%...
Expected energy in and out of battery system:
Sizing
 Battery will be most used in July and August while it will be least...
Calculations:
The hybrid system required 500 Torjan T-105 batteries (each 1350Whr).
So the potential energy stored in the ...
Calculations:
Possible maximum daily average power , 147kW ~ 150kW
gHQP 
For, H = Gross head in m (63m), g = 9.81 m/s...
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 ...
Dynamic simulation of grid connected PHS:
 The pump is considered as a 150kW centrifugal pump with induction
machine
 Th...
Dynamic simulation of grid connected PHS:
SIMULINK representation of Diesel-wind-hydro hybrid power system in Ramea
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= ...
Dynamic simulation of grid connected PHS
Expected power changes in a transient condition in the Ramea Hybrid power system
...
Dynamic simulation of grid connected PHS:
Expected transients in the Ramea hybrid power system
Hydro turbine is
operating
...
Conclusions:
 Diesel fuel saved by 94,782L per year
 Cost of energy reduced by 0.03$/kWh
 All excess electricity will b...
Future recommendation:
 Battery system can be replaced by actual pumped hydro system.
 Soft starter can be used for redu...
Acknowledgement:
 M. Tariq Iqbal
 Nalcor energy (Newfoundland Hydro)
 The Leslie Harris Centre of Regional Policy and D...
Thank you
For your attention and presence
Question / Comments
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The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference

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The Eighteenth Annual Newfoundland Electrical and Computer Engineering Conference

  1. 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. 2. Outline  Introduction  Motivation  Sizing  Dynamic simulation  Conclusion
  3. 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. 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. 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. 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$/kWhr  Hydrogen generator will run 702hrs/yr
  7. 7. Sizing Analysis of proposed Ramea wind-diesel-pumped hydro system:  Overall efficiency of the battery was reduced to 70% to represent a pumped hydro energy storage system.  A 250kW converter is considered between AC and DC bus  Renewable energy fraction is considered 37%
  8. 8. Sizing HOMER simulation result of Ramea wind-diesel-pumped hydro system:  Battery bank (consisting of Trojan T-105 batteries) should have 500 batteries.  Cost of Energy is 0.218$/kWhr  Diesel required 783, 529L/yr
  9. 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. 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. 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. 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. 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. 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. 15. Dynamic simulation of grid connected PHS: SIMULINK representation of Diesel-wind-hydro hybrid power system in Ramea
  16. 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. 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. 18. Dynamic simulation of grid connected PHS: Expected transients in the Ramea hybrid power system Hydro turbine is operating Hydro pump is operating
  19. 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. 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. 21. Acknowledgement:  M. Tariq Iqbal  Nalcor energy (Newfoundland Hydro)  The Leslie Harris Centre of Regional Policy and Development, MUN
  22. 22. Thank you For your attention and presence Question / Comments

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