load shaping to right-size energy storage...jan 12, 2021 · load shaping to right-size energy...
TRANSCRIPT
![Page 1: Load Shaping to Right-size Energy Storage...Jan 12, 2021 · Load Shaping to Right-size Energy Storage Matt Bergan, PE Kotzebue Electric Association (KEA) m_bergan@kea.coop 907-412-1591](https://reader035.vdocuments.site/reader035/viewer/2022071503/61236476fd494b2bb9313b6b/html5/thumbnails/1.jpg)
Load Shaping to Right-size Energy Storage
Matt Bergan, PEKotzebue Electric Association (KEA)
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About Kotzebue Electric Association– Located above the Arctic Circle in Northwest Arctic
Borough• Hub community for 11 surrounding villages
– KEA operates a wind-diesel hybrid power system• Average load – 2000 kW; 3500 kW maximum• 6 diesels – 725 kW to 3080 kW• 11 wind turbines – 2,408 kW total• Eight 66kW PV arrays – 532 kW total• ~4.5 million kWh annual wind/PV production – 15 -
20% capacity factor• Average cost to members – 39 cents per kWh• 14 employees (5 office, 2 linemen and 7 operators)
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KEA Technical Overview• Winter loads 2-3.5 MW. Summers 1.5 – 2.5 MW.
Typical diurnal load pattern.• ~1.2 Million Gallons #2 ULSD Diesel Consumption• Automated ~12MW diesel plant. Four EMD 710
gensets and two smaller Caterpillars.• Two EWT 900kW wind turbines and 9 small wind
turbines (AOC, NW100, Eocyle and Vestas).• 1 MVAr ABB Statcom• 1.225MW/950kWH SAFT Li-ion Battery (BESS).• 450kW (15kW x30 stages) electric boiler at local
hospital.
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The KEA energy storage journey…
• ~50kWh Ni-Cad bank at Wales, AK connected to DC-AC rotary converter (1998-2002)… Worked well and batts still good!
• ~1.8MWh zinc-bromide flow battery with 500kW inverter (2010-2013)
• 950kWh lithium-ion bank connected to 1.225MW inverter…. Voila!
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Wales Ni-Cd Bank (SAFT) coupled to DC-AC rotary converter.
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PremiumPower Flow Battery
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KEA BESS Sizing Approach• What do we want the BESS to do? – Provide spinning reserve and peaking to the
online diesel generation.– Capture excess renewable and diesel power
generation.– Form the grid for diesel-off mode if possible.
• How much money do we have?– Inverter (power)capacity proportional to $$$– Battery (energy)capacity proportional to $$$– Inverter + Battery capacity = $$$$$$
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KEA Priority: Power!• With the available project budget of $1.5M, the
KEA priority was to have the BESS provide enough power to:– Provide immediate power (spinning reserve) for the
loss/trip of one EWT 900kW turbine for 1 hour. FEWER PARTIAL OUTAGES!
– Provide peak shaving capacity for EMD genset during shoulder season loads (100-300kW needed for 3-6 hours per day).
– Plant black-start capacity and for emergency situations.
• Energy storage needed for these modes: ~1MWh • Maximum renewable energy storage scenario:
~12MWh (summer-time, high winds)
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KEA 1.25MW/950kWh BESS (2015)SAFT Intensium Max 20M container
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SAFT Batt Container in Substation
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ABB PCS100 1225kW Inverter
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ABB Inverter in EMD engine bay
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EWT Turbine Tripped OFF
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Excess Renewable Energy Capture and Usage
• Ideal capacity for KEA BESS is ~8-12MWh to capture ALL excess renewable generation with 1MW diesel base load (needed for grid forming and heat generation).
• Large BESS not affordable YET; instead, create load to utilize excess renewable generation:– Electric boilers.– Electric furnaces/heaters.
• Kotzebue heat needs are nearly year-round for space and hot water heating.
• Heating fuel costs ~$5/gallon in Kotz!
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Load Shaping with Controllable Electric Loads
• Excess renewable power generation directed by KEA controlled electric boilers to boost temperature of hydronic thermal systems at local commercial facilities.
• Facility owner pays the cooperative for the BTU absorbed by facility each month. Cost per BTU keyed the cost of heating fuel with a discount.
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BESS and Boiler in SCADA HMI
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450kW Electric Boiler at Kotzebue Hospital (hospital owned, KEA controlled)
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Thermal energy storage at hospital 450kW. (~750,000kWh annual consumption)
All stages of boiler active. Hospital oil boilers not running. 18
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Planned Thermal Energy Storage
• 108kW at NPS Northwest Arctic Heritage Center (Summer 2021).
• 100kW at 29-Unit apartment building (2021).
• Additional ~500kW being explored for other Kotzebue commercial building and possibly residences.
• Total electric thermal storage planned is ~1200kW
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Conclusion…• KEA using Lithium-ion BESS for power and grid
support functions.• Thermal storage used to capture excess
renewable power for community heating and cooperative revenue as an alternative to battery storage.
• NEXT STEPS:– Increase renewable generation and BESS
capacity to be able to operate diesel-off.– Keep an eye out for reliable, and cost effective
LONG TERM battery storage.– HYDROGEN?