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Storage End Effects: An evaluation of common storage modelling assumptions

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Storage End Effects: An evaluation of common storage modelling assumptions

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Storage End Effects: An evaluation of common storage modelling assumptions

  1. 1. Storage End Effects An evaluation of common storage modelling assumptions Taco Niet Assistant Professor of Professional Practice School of Sustainable Energy Engineering Simon Fraser University ETSAP Workshop Paris, France, June 7, 2019
  2. 2. Background/Motivation 2 How to deal with storage at end of model period has received little attention in the literature: Some studies require refilling of storage Many run a longer model period and cut off the end effects One study applied a value for stored energy at end of period using “heuristic based on operator experience” (Castronuovo and Usaola 2013) No study has looked at how to value storage at the end of a model period and how different methods impact the model results Castronuovo ED, Usaola J. Coordination Between Wind Farms and Storage Devices, Technical and Economic Aspects. Handb. Wind Power Syst., Heidelberg ; New York: Springer; 2013, p. 591.
  3. 3. Methods 3 21.2 GW of wind One week 10 minute resolution Simplified storage model Methods compared: Refilling (baseline) 28 X 6 hours with stored energy valued 168 X 1 hours with stored energy valued 28 X 6 hours with six hour look ahead 14 X 12 hours with twelve hour look ahead Rainflow counting used to compare storage operation
  4. 4. 28 X 6 Stored Energy Value 4 • Dashed line is one week with refilling (baseline) $50/MWh $158/MWh $1000/MWh 21.2 GW Wind 14 GWh Storage Week in middle of year
  5. 5. 168 X 1 Stored Energy Value 5 • Dashed line is one week with refilling (baseline) 21.2 GW Wind 14 GWh Storage Week in middle of year $50/MWh $158/MWh $1000/MWh
  6. 6. Look Ahead Stored Energy 6 • Dashed line is one week with refilling (baseline) Six Hour Twelve Hour 21.2 GW Wind 14 GWh Storage Week in middle of year
  7. 7. Characterizing Storage Operation 7 Rainflow Counting Common method for characterizing storage cycling Counts number of cycles (and partial cycles) By Cutler at English Wikipedia [Public domain], via Wikimedia Commons
  8. 8. Look Ahead Cycle (Rainflow) Counts 8 21.2 GW Wind 14 GWh Storage Week at start of year
  9. 9. 28 X 6 Storage Cycle (Rainflow) Counts 9 21.2 GW Wind 14 GWh Storage Week at start of year
  10. 10. 168 x 1 Storage Cycle (Rainflow) Counts 10 21.2 GW Wind 14 GWh Storage Week in middle of year
  11. 11. Conclusions 11 Valuing storage appears to provide an alternate to modelling longer periods and discarding the ends The value of the stored energy depends on the model structure – need to investigate this more Different choices of storage model structure has a significant impact on model results and should not be taken lightly
  12. 12. Questions/Discussion? Taco_Niet@sfu.ca

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