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Bruce + West Limits

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Bruce + West Bottling
The IESO Transmission System
тАв The transmission system is made up of a
number of circuits all of which have unique
capabilities and thermal limitations.
тАв Our generation dispatching tool is designed to
recognize these limitations and dispatch
resources appropriately in order to respect them.
тАв These limitations at times lead to an inability to
utilize available generation due to a lack of paths
out of a region тАУ Bottled Energy
The IESO Transmission System
тАв These values are dynamic and can change every
5 minutes based on temperature, wind speed,
day/night etc...
тАв Result of which are two schedules (constrained
and unconstrained)
тАв As these limitations are automatically respected
there is no formal operating instruction for how
to manage these limits.
тАв In other words, no SCO exists for these subareas
Circuit Thermal Ratings
тАв The thermal capabilities of the circuits are
provided to us from each circuitтАЩs asset owner
тАв Revised thermal limits, in the form of a lookup
table are provided to the IESO for each circuit
every hour to reflect current real time
conditions.
Bottling Estimates
тАвBottled generation is normally calculated by zone
whereby:
тАвBottled Gen = Available Gen-Zonal Demand
-Ability to leave Zone
тАвZones are generally divided by transmission
interfaces.
Bruce + West Transmission
BRUCE
FABCW
MICH-ONT
INTERFACE
WEST
SOUTH WEST
Interface Limits
тАв FABCW is the Flow Away from the Bruce Complex +
Wind
тАв FABCW limit is dependent on a number of factors
including actual flow on the BLIP interface.
тАв This limit is required to preserve plant stability in the area
as well as to protect against voltage collapse post
contingency.
тАв BLIP is the Buchanan Longwood Input.
тАв BLIP flow 0 is generally limited to 3,000 MW and Negative
BLIP (NBLIP) generally varies between 500 to 1,500 MW.
тАв Both limits are based on voltage limitations
Interface Limits
тАв At times, the transmission capability internal to a
zone may be more limiting than the interface
limit.
тАв In these cases, the traditional methodology for
measuring Bottling is not adequate
тАв This is the case in the West and thus the zone was
divided into 4 sub-areas, each divided by a
boundary.
тАв The traditional bottling equation is then applied
to each individual sub-area.
The WEST
Each sub-area contains both
generation and load.
яВО
MICHONT
яВМ
G
яВН
яВОяВП```
L
G
`L
`
`
`
яВП
NBLIP
тЙИ 500 - 1,500 MW
G
G
L
L
Boundary Thresholds
1. 3,058 MW тАУ 4,045 MW
2. 3,010 MW тАУ 3,981 MW
3. 2,218 MW тАУ 2,836 MW
Bottling In The West
тАв These four boundary thresholds are based on
simulations done by the IESO.
тАв The simulation was designed to maximize
generation.
тАв The boundary threshold values are the
estimated maximum total generation that can be
produced before a thermal limit of a circuit out
of that sub-area begins to encroach on its limit.
тАв These boundary threshold values are used as
estimates for modelling purposes only.
Bottling In The West
тАв Because these boundary are a result of thermal
restrictions, each boundary has a different
threshold for a number of temperature ranges.
тАв The threshold range is based on temperatures
from -20┬░C to 35 ┬░C and change by 5┬░C
increments
Boundary Thresholds
Temperature (┬░C)
Boundary 1 (MW) Boundary 2 (MW) Boundary 3 (MW)
-20
4,045
3,981
2,836
-15
3,968
3,905
2,786
-10
3,885
3,824
2,737
-5
3,789
3,729
2,684
0
3,711
3,652
2,635
5
3,629
3,571
2,586
10
3,531
3,476
2,537
15
3,431
3,376
2,467
20
3,353
3,300
2,418
25
3,256
3,205
2,353
30
3,155
3,105
2,287
35
3,058
3,010
2,218
Looking Forward
тАв Transmission enhancements throughout the
province
тАв The shutdown of coal fired generation
тАв Bottled numbers are expected to decrease
Thank You!
Questions?
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