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Energy Storage Overview and Intro to Flywheel Energy Storage

Electrical/Thermal Conversion and Storage Technology and Opportunities Mike He, Achintya Madduri, Evan Reutzel, Seth Sanders. Energy Storage Overview and Intro to Flywheel Energy Storage Solar-Thermal, Thermal Storage, CHP: Mike and Achintya Flexible ac/dc line interface: Evan.

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Energy Storage Overview and Intro to Flywheel Energy Storage

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  1. Electrical/Thermal Conversion and Storage Technology and OpportunitiesMike He, Achintya Madduri, Evan Reutzel, Seth Sanders • Energy Storage Overview and Intro to Flywheel Energy Storage • Solar-Thermal, Thermal Storage, CHP: Mike and Achintya • Flexible ac/dc line interface: Evan

  2. Energy Storage Overview • Energy arbitrage return: • $0.30/kw-hr-day gives about $100/kw-hr-year • For 3 year ROI: capital value at ~$300/kw-hr • Extra value in: • Avoided demand charge on customer side • UPS, islanding function • Power quality

  3. Electricity Storage Assoc Chart: http://www.electricitystorage.org/site/technologies/

  4. Per cycle capital cost (ESA)

  5. DOE National Energy Technical Laboratory Report, Sept 2009

  6. History: “Integrated” Flywheel Energy Storage System • 150 w-hr system scaled for HEV application in late 1990’s • Homopolar Synchronous Design • Single-Piece Solid Steel Rotor/Energy Accumulator • 3-5 W-hr/kg energy density for complete system • Six-Step Drive for total system eff. = 85% • Tested to 60 krpm, rated to 100 krpm

  7. Flywheel Energy Storage • New effort with Prof. Hari Dharan (ME Dept) • Infinite cyclability • Power and energy scale independently • Can use commodity materials: • Steel, composites, natural fiber composites • Technical challenges, details in: • rotor materials, design • containment • Motor/alternator • bearing system(s) • power electronic interface and controls

  8. Estimated cost breakdown, based on 40-100 kw-hr system ($/kWh)

  9. Rotor Analysis • Energy density ~ strength/weight ratio • Ex’s: • High strength steel: ~ 66 W-hr/kg • Engineering composites: much higher ~500 Whr/kg • Derate by: • Shape factor: 0.5 -1 • Speed range: 0.84 for 40-100 % range • Safety/fatigue factor • Steel example: 15-30 W-hr/kg after derating • Fabricated steel cost: $2-4/kg ==> $60-120/kw-hr • Design for no failure, like aircraft

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