1
GE Experience with Turbine
Integrated Battery Energy
Storage
Nicholas W. Miller, GE
Today’s
Wind Plants
w/o ES:
Inertial
Response
Grid Operations …
A wide range of timescales
Frequency Droop
1 min
1 sec
0.1
1
Curtailment/
dispatch down
10
10 min
100
1000
1 day
1 hr
10,000
100,000
1 wk
1000,000
Time (s)
Enhanced:
Today’s
• Short-term scheduling (predictable power)
Wind Plants
• Ramp Control
with ES:
• Frequency Regulation (Secondary Response)*
*Careful of language…many variations
world-wide, with different meanings!
© 2014 General Electric Company
What
didP we do?
P
grid
line
Filter
Grid
690 volts
Pstator
Protor
Rotor-side
converter
Line-side
converter
Doubly-fed induction
generator (DFIG)
Battery connection at the DC link thru
bi-directional DC-DC converter
Central vs. Integrated Storage
Central Storage
Integrated Storage
•Battery Integration point: as part of
•Battery Integration point: via the
the farm, just like an additional turbine.
Typically in 1-2 MW blocks.
WTG converter. Distributed as 200 KW
blocks throughout the farm.
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
0
5
10
15
20
25
Time (min)
Okay … what else are we doing?
© 2014 General Electric Company
How might storage work in a 5 minute
cycle Economic Dispatch system?
© 2013 General Electric Company
30
Frequency Regulation…”REG”
AGC signal
Farm output w/
frequency reg.
Wind plant dispatched
Frequency Regulation Pilot at Goldthwaite Texas
© 2014 General Electric Company
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
Today’s Frequency Response Curve
Integrated Energy Storage Frequency
Response Curve
Participate more competitively and more often in future primary frequency
response markets
11
© 2013 General Electric Company
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
10
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
11
GE Hybrid Wind Turbine
Invenergy Goldthwaite Site
Chopper/
Switches
Batteries
12
HMI – During Predictable Power
Operation
13
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….
Thank you!
[email protected]