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GE Experience with Turbine
Integrated Battery Energy
Storage
Nicholas W. Miller, GE
1
© 2014 General Electric Company
1 sec 1 min 10 min 1 hr 1 day 1 wk
0.1 1 10 100 1000 10,000 100,000 1000,000
Time (s)
Inertial Response
Frequency Droop Curtailment/dispatch down
Enhanced:• Short-term scheduling (predictable power)• Ramp Control • Frequency Regulation (Secondary Response)*
Today’sWind Plantsw/o ES:
Today’sWind Plantswith ES:
Grid Operations … A wide range of timescales
*Careful of language…many variations
world-wide, with different meanings!
What did we do? Filter
Grid
Pgrid
Pstator
Pline
Rotor-side
converterLine-side
converter
Doubly-fed induction
generator (DFIG)
690 volts
Protor
Battery connection at the DC link thru bi-directional DC-DC converter
•Battery Integration point: as part of
the farm, just like an additional turbine.
Typically in 1-2 MW blocks.
•Battery Integration point: via the
WTG converter. Distributed as 200 KW
blocks throughout the farm.
Central vs. Integrated Storage Central Storage Integrated Storage
Inverter
BOP Required: separate inverter, switchgear, cabling, and transformer.
BOP Required: Filter cabinet, DC chopper, and cabling.
How does it work? Connected 200kWhs of batteries w/ GE 1.6-100 in 2012
@Tehachapi and demonstrated Predictable Power
Okay … what else are we doing?
Time (min)
0 5 10 15 20 25 30
© 2014 General Electric Company
© 2013 General Electric Company
How might storage work in a 5 minute
cycle Economic Dispatch system?
© 2014 General Electric Company
AGC signal
Farm output w/frequency reg.
Frequency Regulation…”REG”
Frequency Regulation Pilot at Goldthwaite Texas
Wind plant dispatched
What’s Next: Primary frequency response*A growing issue today:
• Today’s State-of-the-art Wind Plants:
• Provide over-frequency response with no opportunity cost
• Provide under-frequency response with opportunity cost: pre-curtailment
• Next-generation with Hybrid turbines:.
• Provide under-frequency response without opportunity cost
• As fast (or slow) as the grid needs
Participate more competitively and more often in future primary frequency response markets
Today’s Frequency Response Curve Integrated Energy Storage Frequency Response Curve
© 2013 General Electric Company 11
What’s Next: WindINERTIAtm….Inertial Response
• Today: Extract rotational
energy; pay back in 10s of
seconds
With Hybrid: Extract battery energy; pay back in 10s of minutes:
© 2013 General Electric Company
Invenergy Goldthwaite Site - ERCOT• First Commercial Installation
• Integrated Energy Storage on 3 GE 2.5 MW –
120meter WTGs
• Now in commercial operation
• Presently in first phase of ERCOT certification
for short-term predictable power
• Second phase of certification for participation
in REG (secondary frequency control) market
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Batteries
Chopper/
Switches
GE Hybrid Wind Turbine
Invenergy Goldthwaite Site
HMI – During Predictable Power
Operation
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Conclusion
• 1st Commercial Installation in operation now
• Certification underway to allow Wind Plant
owner to participate in ERCOT ancillary
services market (by end 2014)
• Many potential opportunities and potential
applications….
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Thank you!
