Reliable Power
Demand Response
Working Group
AESO ‘As Is’ and Needs Assessment
Reliable Markets
Reliable People
Jerry Mossing
Director,
Operations Planning
Paul Barry
Director, Market Services
Purpose
• Provide information to the Demand Response Work
Group (DRWG) that helps the group understand :
– what operational situations that may require resources to
manage,
– What resources are currently available,
– How these resources are used, and
– Experience to date
• Opportunity for the DRWG to ask questions and
provide feedback.
2
AESO Operations Concern
•
There is a strong possibility that sometime in the next several years;
– transmission constraints may increase,
•
Delays in north south, south west, etc.
– supply shortfall events may be more frequent,
•
LTA metrics indicate decreasing supply margin however no trigger action at this time
– wind’s fast down-ramps exceeding system ramp up capability.
•
MOF implementation underway. Approximately 11,000 MW in the queue.
– Each of these operating situations:
•
will be managed using procedures that ultimately end in manual load
curtailment procedures. (e.g. OPP 5xx, OPP 801, etc.)
•
contains a gap between the point where supply runs out and manual
(involuntary) load curtailment is necessary. The gap is demand response.
3
AESO Operations
•
Price responsive loads acting independently have an
impact to the energy market
– Independent action by a significant amount of load in response to
System Marginal Price (SMP) has a direct impact to AIES supply
demand balance.
– Regulating reserve volumes may mask some of the effect but most
often a generator dispatch is required.
– System Marginal Price changes with generator dispatch
– The cycle may repeat, depending on many factors including
volumes and prices in the merit order
4
Current Load Response
Operating Situation
Supply Shortfall
ENMO & ASMO
PRL
Transmission Constraint
(Downstream or Load pocket)
Wind Fast Ramp Down
High Import
LSS
Loss of One Generator
SUPL
Procedures
Last Resort
Involuntary
Curtailment
VLCP Inter-ties
SUPL LSS Fluff
DOS
Involuntary
EOS Trigger DTS Curtailment
Involuntary
Curtailment
ILRAS
Large Loss of Generation
(Alberta or in WECC)
UFLS
UFLS
Time
5
Current Load Response
Operating Situation
Supply Shortfall
ENMO & ASMO
PRL
Transmission Constraint
(Downstream or Load pocket)
•No requirement to be in the
merit
order
Wind
Fast
Ramp Down
•Independent action by
load(s) has a direct impact
High
Import
to the
supply/demand
balance and will cause
Loss
of One Generator
generator dispatch and
SMP
will change
Large
Loss
of Generation
•E.g. An
(Alberta
or unintended
in WECC)
consequence - 50 MW need
for supply could result in
300 MW load response
LSS
Procedures
Last Resort
Involuntary
Curtailment
VLCP Inter-ties
SUPL LSS Fluff
DOS
Involuntary
EOS Trigger DTS Curtailment
Involuntary
Curtailment
ILRAS
UFLS
SUPL
UFLS
Time
6
Current Load Response
Operating Situation
Supply Shortfall
ENMO & ASMO
PRL
Transmission Constraint
(Downstream or Load pocket)
processes
Wind• Manual
Fast Ramp
Down
involving phone calls and
paper.
High•Doesn’t
Importscale to large
number of participants
Loss•No
of measurable
One Generator
response
other in real time
Large•The
Loss
of Generation
program exists but no
(Alberta
in kW)
WECC)
MW or
(only
LSS
Procedures
Last Resort
Involuntary
Curtailment
VLCP Inter-ties
SUPL LSS Fluff
DOS
Involuntary
EOS Trigger DTS Curtailment
Involuntary
Curtailment
ILRAS
UFLS
SUPL
UFLS
Time
7
Current Load Response
Operating Situation
ENMO & ASMO
Supply Shortfall
PRL
Transmission Constraint
(Downstream or Load pocket)
– emergency
Wind• Inter-ties
Fast Ramp
Down
energy agreements
• Many steps, not many MW
High•LSS,
Import
DOS are likely price
responsive loads
Loss•3%
of One
Generator
voltage
reduction,
pleas, non-essential loads =
Largefluff
Loss of Generation
LSS
Procedures
Last Resort
Involuntary
Curtailment
VLCP Inter-ties
SUPL LSS Fluff
DOS
Involuntary
EOS Trigger DTS Curtailment
Involuntary
Curtailment
ILRAS
UFLS
SUPL
UFLS
(Alberta or in WECC)
Time
8
Current Load Response
Operating Situation
ENMO & ASMO
Supply Shortfall
PRL
Transmission Constraint
(Downstream or Load pocket)
•AESO directs DFO curtailment
Windvolume
Fastas Ramp
Down
a percentage
of load.
•DFO procedures identify load
breakers to trip. TFOs carry out the
procedures as they have 24/7 control.
SCADA required to be effective in 10
minutes. Load curtailments may be
rotated between breakers during
longer duration events.
•The breakers used in these
procedures must be coordinated with
UFLS (so as to preserve load in some
of the UFLS blocks)
•This is typically when the terms
rotating outages or brown outs are
used, even for short duration events.
High Import
LSS
Loss of One Generator
SUPL
Procedures
Last Resort
Involuntary
Curtailment
VLCP Inter-ties
SUPL LSS Fluff
DOS
Involuntary
EOS Trigger DTS Curtailment
Involuntary
Curtailment
ILRAS
Large Loss of Generation
(Alberta or in WECC)
UFLS
UFLS
Time
9
Current
Load Response
•Under frequency event caused
by BC tie line trip during high BC
import
•Also used when Alberta is
Operating
Situation
ENMO & ASMO
islanded
•Automatic action, load breakers
PRL
Supply
areShortfall
tripped by relay (either UF or
tie trip)
•Allows operating criteria to be
Transmission
Constraint
met while enabling
high BC
(Downstream
or Load
pocket)firm
imports though
preventing
load loss for N-1.
loads may be price
Wind•LSS
Fast
Ramp Down
responsive.
High Import
LSS
Loss of One Generator
SUPL
Procedures
Last Resort
Involuntary
Curtailment
VLCP Inter-ties
SUPL LSS Fluff
DOS
Involuntary
EOS Trigger DTS Curtailment
Involuntary
Curtailment
ILRAS
Large Loss of Generation
(Alberta or in WECC)
UFLS
UFLS
Time
10
Current
Load Response
•Safety net for extremely large
loss of generation
•This is the last automatic action
to keep the system up before
Operating
Situation
ENMO & ASMO
generators trip to protect their
equipment.
PRL
•WECC
requirement
Supply
Shortfall
•The breakers used in these
procedures must be coordinated
Transmission
with manual Constraint
load shed
(Downstream
or Load
procedures
(so as pocket)
to preserve
some load in the manual load
shed blocks)
Wind Fast Ramp Down
High Import
LSS
Loss of One Generator
SUPL
Procedures
Last Resort
Involuntary
Curtailment
VLCP Inter-ties
SUPL LSS Fluff
DOS
Involuntary
EOS Trigger DTS Curtailment
Involuntary
Curtailment
ILRAS
Large Loss of Generation
(Alberta or in WECC)
UFLS
UFLS
Time
11
Current
Load Response
•Contingency Reserves
•WECC requirement
•No concurrent use
•Technical requirements well
Operating
Situation
ENMO
defined, including performance
requirement
Supply Shortfall
& ASMO
PRL
Transmission Constraint
(Downstream or Load pocket)
Wind Fast Ramp Down
High Import
LSS
Loss of One Generator
SUPL
Procedures
Last Resort
Involuntary
Curtailment
VLCP Inter-ties
SUPL LSS Fluff
DOS
Involuntary
EOS Trigger DTS Curtailment
Involuntary
Curtailment
ILRAS
Large Loss of Generation
(Alberta or in WECC)
UFLS
UFLS
Time
12
Current Load Response
Operating Situation
Supply Shortfall
ENMO & ASMO
PRL
Transmission Constraint
(Downstream or Load pocket)
Wind Fast Ramp Down
High Import
LSS
Procedures
Last Resort
Involuntary
Curtailment
VLCP Inter-ties
SUPL LSS Fluff
DOS
Involuntary
EOS Trigger DTS Curtailment
Involuntary
Curtailment
ILRAS
UFLS
•The
possibility exists that in the
next few years supply shortfall,
Loss of One
Generator
SUPL
transmission constraints and wind power ramps will result in more frequent
curtailment.
Large Loss involuntary
of Generation
•No reasonable mechanism or program exists to fills this gap.
(Alberta or in
WECC)
•Demand
response programs that establish loads who can voluntarily curtail
load prior to involuntary curtailments seems a reasonable approach to
Time
preserve reliability and FEOC?
•Can a comprehensive demand response program be implemented in time?
When exactly is the need? Whose job is it?
UFLS
13
Reliable Power
Demand Response
Commercial Experience
Reliable Markets
Reliable People
AESO Commercial Experiences
•
Load Participation
– 20MW for supplemental reserves
– 120MW for under frequency mitigation
– An incremental 100MW expressed interest recently in providing an under
frequency mitigation service
•
Majority of dealings with pulp and paper related customers
•
AESO yet to contract with a Demand Aggregator
•
Up to 240MW for ILRAS during supply shortfall events
•
* VLCP – created by way of EUB Negotiated Settlement in 2000 to
balance supply/demand – no longer used
•
* DOS – alleviates abnormal conditions
(* not AESO Commercial dealings)
15
Questions/Comments
on Implementation
16
Reliable Power
Thank you!
Reliable Markets
Reliable People