The Viability of Balancing Wind Generation with Storage

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The Viability of Balancing Wind Generation with
Storage

• Batsaikhan Nyamdash
• Supervisor Dr. Eleanor Denny

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Contents

• Why it is important to study?
• General information
• Questions addressed
• Results
• Conclusion

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Why it is important to study?

• Increasing wind penetrations
• EU policy (22 of the electricity produced in EU
  will come from RES)
• Greenhouse gas emission
• Ireland has one of the best wind resources
• Cheap
• Because of its unpredictable nature, we face the
  challenge of variable outputs
• Debates on using storage to balance wind

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General Information

• Available storages
• - Pumped Hydro Storage

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General Information

• - Compressed Air Electricity Storage

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General Information

• - Hydrogen Storage

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General Information

• - Batteries (Polysulfide Bromide Flow Battery,
  Vanadium Redox Flow Battery, Zinc Bromine Flow
  Battery, Sodium Sulfur Battery, Lead-Acid
  Battery, Metal-Air Battery and Lithium ion
  Battery)

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General information
- Capital cost and the efficiency of the storage
http//electricitystorage.org/tech/technologies
_comparisons_capitalcost.htm
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Questions addressed

• Question 1
• The effect of wind and storage on the plant mix
• Question 2
• The effect of wind and the storage on the load
• Question 3
• Optimizing time frame for the operation of the
  system with wind and storage
• Question 4
• Is it profitable?

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Question 1 The effect of wind and storage on the
plant mix
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85
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Question 1 The effect of wind and storage on the
plant mix

• Storage is charged by the wind farm if the wind
  energy is enough to charge it, otherwise the
  balance is charged by the conventional PG until
  it is full.

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Question 1 Result

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Question 1 Result
Demand
Demand-Wind-Storage
Demand -Wind
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Question 1 Result
12 Turlough Hills
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Question 1 Conclusion

• Wind with storage
• At lower levels of installed capacity of storage
• Increasing storage
• Increases the participation of the base-load
  plants
• Decreases the participation of the mid-merit
  plants
• At higher levels of installed capacity of storage
• Increasing storage
• Significantly increases the participation of the
  mid-merit plants and decreases the participation
  of the base-load plants
• Increases the participation of the peaking plants

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Question 2 The effect of wind and the storage on
the load
Charging
Base-load strategy
Discharging
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Question 2 The effect of wind and the storage on
the load
Mid-merit strategy
Charging
Charging
Discharging
Base-load strategy
Discharging
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Question 2 The effect of wind and the storage on
the load
Discharging
Peak strategy
Mid-merit strategy
Charging
Charging
Charging
Discharging
Base-load strategy
Discharging
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Question 2 Result
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Question 2 Conclusion

• Mid-merit strategy is the best strategy in terms
  of smoothening the load when 24 hours time frame
  was used for the optimisation

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Question 3 Optimizing the time frame
24 hours
48 hours
96 hours
192 hours
24 hours
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Question 3 Result
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Question 3 Conclusion

• Operational schedules were interrupted more when
  longer time frames were used.
• Hence the 24 hours time frame exploits the best
  use of the system with wind and storage

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Question 4 Net profit

• Storage buys a power from the wind until the
  storage is full when demand and price are low (12
  hours during the night)
• Wind farm sells the power to the storage and the
  market if the storage is full
• Storage sells the power to the market when the
  demand and price are high (12 hours during the
  day)

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Question 4 Net profit Price volatility
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Net Profit Installed capacity Wind farm 1500MW
and Storage 500MW
5 SD 2 SD 0 SD
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Net profit Conclusion

• Wind farm without storage is more profitable than
  with storage
• For the wind storage to be profitable, the
  capital cost has to be 150K or less

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• Thank you very much
• Comments Questions ?