Transcript RTWG 07-14-2009

Renewable Technology
Working Group (RTWG)
July 14, 2009
Henry Durrwachter
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ERCOT Antitrust Admonition
ERCOT strictly prohibits market participants and their
employees who are participating in ERCOT activities
from using their participation in ERCOT activities as a
forum for engaging in practices or communications that
violate the antitrust laws. The ERCOT Board has
approved guidelines for members of ERCOT
Committees, subcommittees and working Groups to be
reviewed and followed by each market participant
attending ERCOT meetings. If you have not received a
copy of these Guidelines, please take one now and
review it at this time. Please remember of your ongoing
obligation to comply with all applicable laws, including
the antitrust laws.
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Agenda
• ERCOT Meeting Report
– TAC
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Solar Thermal Technology in the ERCOT Market
Review Whitepaper on Issue SO-5
Discuss NERC Study of Variable Generation
Review TRIP Comments (if any)
Other Business – Capacity Value of Wind
Next RTWG Meetings
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TAC Meeting Report
• TAC approved the 2nd Quarter TRIP
Update
• Lively discussion about the issue of CREZ
outage planning
– Kent Saathoff and Dan Woodfin agreed to
work on a draft proposal that will be presented
at the next RPG meeting
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NERC Study
• In December 2007, NERC
Planning and Operating
Committees created the
Integration of Variable
Generation Task Force
(IVGTF)
• IVGTF composed of a
Leadership Team (6
persons) and 16 members
from across North America
supported by NERC staff
(4)
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NERC Study
Charge to the IVGTF:
1. Raise industry awareness and understanding of
variable generation characteristics as well as system
planning and operational challenges expected with
accommodating large amounts of variable
generation;
2. Investigate high-level shortcomings of existing
approaches used by system planners and operators,
and the need for new approaches to plan, design
and operate the power system; and
3. Broadly assess NERC Standards to identify possible
gaps and requirements to ensure bulk power system
reliability.
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NERC Study
• Executive Summary
– NERC will develop a reference manual to educate
and guide the electric industry as the integration of
large-scale variable generation continues.
– The electric industry is also encouraged to consider
developing consistent interconnection standards for:
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voltage and frequency ride-through capability,
reactive/real power control,
frequency and
inertial response.
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NERC Study
• Executive Summary
– High levels of variable generation will require significant
transmission additions and reinforcements
– Additional flexible resources such as demand response, plug-in
hybrid electric vehicles, and storage capacity (e.g., CAES) are
needed.
– Enhanced measurement and forecasting of variable generation
output is needed in both real-time operations and long-term
planning.
– More comprehensive planning approaches (from the distribution
system through the bulk power system) are needed, including
probabilistic approaches at the bulk system level
– Greater access to larger pools of available generation and
demand.
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NERC Study
Recommendations to Industry
1. Existing bulk power system voltage ride-through
requirements and the distribution system anti-islanding
voltage drop-out requirements of IEEE Standard 1547
must be reconciled.
2. Industry activities (e.g., IEEE and WECC) efforts on
developing short circuit and dynamic models should be
support and encouraged.
3. Variable generation owners, operators, and vendors
must familiarize themselves with the intent and
purposes of NERC’s Modeling, Data, and Analysis
(MOD) Standards.
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NERC Study
Recommendations to Industry
4. The use of probabilistic planning techniques and
approaches should be investigated and adopted for
the planning and design of bulk power systems with
high levels of variable generation.
5. Minimum requirements and/or market mechanisms
(e.g., price signals) should be developed to ensure that
all generation, the bulk power system and resulting
system operation has the desired characteristics (e.g.,
ramping requirements, minimum generation levels,
shorter scheduling intervals, etc.) and to foster an
appropriate resource mix that will maintain reliability.
6. Variable generation manufacturers should support the
development of detailed 3-phase models required for
special power system studies.
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NERC Study
Recommendations to Industry
7. State, provincial, and federal agencies and policy
makers should consider:
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Impacts of variable generation integration on interstate and
provincial bulk power system reliability in their oversight and
evaluations
Collaborative efforts needed to remove obstacles, accelerate
siting, and approve permits for transmission line construction
The importance of coordinated transmission and resource
planning
The issues and opportunities assocaiated with larger
balancing areas and the desirability of shorter resource
scheduling intervals or regional dispatch optimization.
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NERC Study
Recommendations to Industry
8. The following industry research and
development activities are needed:
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Develop demand respons and storage
technologies.
Monitor the impact on reliability of distributed
variable generators.
Improve forecasting methods, in particular, specific
applications such as severe weather and next
hour(s) ramping event forecasting.
Develop advanced probabilistic power system
planning techniques.
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NERC Study
Work Plan
• Develop models for variable generation (IVGTF
Planning Sub-Group - 4th Qtr. 2010)
• Develop methods to calculate capacity values for
variable generation (NERC Reliability Assessment
Subcommittee - 4th Qtr. 2010)
• Enhance interconnection procedures and standards
to address voltage and frequency ride-through,
reactive and real power control, frequency and inertial
response (IVGTF Planning Sub-Group - 4th Qtr. 2010)
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NERC Study
Work Plan
• Resource adequacy and transmission planning
approaches must consider needed flexibility to
accommodate variable generation (Resource Issues
Subcommittee - 4th Qtr. 2010)
• Integration of large amounts of plug-in hybrid
vehicles, storage and demand response programs
should be considered in planning studies (IVGTF
Planning Sub-Group - 4th Qtr. 2010)
• Probabilistic planning techniques and approaches are
needed to ensure that system designs maintain bulk
power system reliability (IVGTF Planning Sub-Group 3rd Qtr. 2010)
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NERC Study
Work Plan
• Existing bulk power system voltage ride-through
performance requirements and distribution
system anti-islanding drop-out requirements of
IEEE Standard 1547 must be reconciled (IVGTF
Planning Sub-Group - 4th Qtr. 2010)
• Variable distributed resources can have a
significant impact on system operation and must
be considered and included in power system
planning studies (IVGTF Planning Sub-Group 2nd Qtr. 2011)
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NERC Study
Work Plan
• Forecasting techniques must be incorporated
into day-to-day operational planning and realtime operations routines/practices including unit
commitment and dispatch (IVGTF Operations
Sub-Group - 2nd Qtr. 2010)
• Balancing areas must have sufficient
communications for monitoring and sending
dispatch instructions to variable resources
(IVGTF Operations Sub-Group - 1st Qtr. 2010)
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NERC Study
Work Plan
• Investigate impact of securing ancillary services through
larger balancing areas or participation in wider-area
balancing management on bulk power system reliability
(IVGTF Operations Sub-Group – 1st Qtr. 2010)
• Enhance operating practices, procedures and tools
(IVGTF Operations Sub-Group – 2nd Qtr. 2011)
• Develop a reference manual for planners and operators
which describes the changes required to plan and
operate the bulk power and distribution systems to
accommodate large amounts of variable generation
(IVGTF - 1st Qtr. 2010)
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Question for RTWG
What issues (if any) raised in the IVGTF
report need to be addressed by RTWG?
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Capacity Value of Wind
• ERCOT now posts hourly load and wind data for the
calendar years 2006, 2007 and 2008, which includes the
installed amount of wind.
• At the peak load hour, the capacity value* of wind was:
– 2006 = 17.6%
– 2007 = 3.9%
– 2008 = 11.7%
– Average (2006-2008) = 11.1%
• Unofficial ERCOT data for 2009 (July 8) indicates that
the capacity value for wind was higher than previous
years (1,610 MW out of 8,135 MW or 19.8%).
*where capacity value = MW produced/MW installed
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Capacity Value of Wind
30.0%
25.0%
Installed Wind Capacity
20.0%
At Peak Hour
Avg. Over Peak*
Top 10 Load Hours
Top 1% Load Hours
Top 5% Load Hours
Top 10% Load Hours
15.0%
10.0%
*Peak hour, the hour
before and the hour after
5.0%
0.0%
2006
2007
2008
Average
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Next RTWG Meetings
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Friday, August 7, 2009
Tuesday, September 8, 2009
Tuesday, October 6, 2009
Tuesday, November 10, 2009
Monday, December 7, 2009
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