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Flow battery storage system for off grid offshore windfarm

Flow battery storage system for off grid offshore windfarm. S ae thor Asgeirsson Mateusz Kluska Jure Vetrsek. Akureyri , 2 0 .6.2009. Table of content. Community Electricity Load modelling Intermittency issues Battery design Conclusions . L oad modelling. Flow batteries.

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Flow battery storage system for off grid offshore windfarm

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  1. Flow battery storage system for off grid offshore windfarm SaethorAsgeirsson Mateusz Kluska Jure Vetrsek Akureyri, 20.6.2009

  2. Table of content • Community Electricity Load modelling • Intermittency issues • Battery design • Conclusions

  3. Load modelling

  4. Flow batteries • Could be a reasonable alternative for load leveling and seasonal energy storage in small grids and stand-alone renewable systems • Promising storage technology • No commercially available applications

  5. Operational principle

  6. Vanadium redox flow battery VO2+ +H2O−e− → VO2+ +2H+ (charge) VO2+ +H2O−e− ← VO2+ +2H+ (discharge) V3+ +e− → V2+ (charge) V3+ +e− ← V2+ (discharge)

  7. Examples

  8. Flow battery pros. • Long cycle life • Short response time and a symmetrical charge/discharge rate • Relatively low cost • Flexible operation • Large scale • High efficiency • Constant level of current/voltage between charge and discharge

  9. Battery system parameters • Voltage: 1000V • Molar concentration of electrolyte: 1mol • Efficiency: 80% • Total energy out: 2.41GWh/yr • Capacity: 979.2MWh • Autonomy: 27 hr • Energy density: 6kg/kWh • Electrolyte tank volume: 960m3 x 2

  10. Comparison with old design

  11. State of charge

  12. Comparision: NaS vs. VRB

  13. Comparision: NaS vs. VRB

  14. Use of excess electricity • We have excess of energy production from wind farm • No possibility to sell to grid • Excess energy for transportation

  15. Hydrogen Production • Available access energy: 34.4 GWh/yr • 90% for production • 10% for compression [700Bar] • Yearly Production : 470 ton • 250 Cars/24-hr

  16. Conclusions • Additional economical benefits from Hydrogen production for transport proposes • Flexible technology – suit capacity to our needs (tank storage size) • Not yet commercially available • Predicted low price

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