MOD_42_10v2 : Changes to the Single Ramp Up Rate and the Single
Ramp Down Rate Calculation
Single Ramp Rate
MSP Software uses
A single ramp rate based on time to ramp between min & max outputs
Generator Units can specify:
5 ramp up rates over 4 ranges and 5 ramp down rates over 4 ranges.
Dwell times describe output levels at which ramping must pause.
Output
(MW)
RAMP
UP
Slope =
Single Ramp
Up Rate
RAMP
DOWN
Availability
Slope =
Single Ramp
Down Rate
Dwell
Times
Min Stable
Generation
Time
Single Ramp up Rate
MW
Real-Time Availability
RUR3
Ramp up Break Point
RUR2
Ramp up Break Point
RUR1
MINGEN
Load up Break Point 2
Load up Break Point 1
Block Load
Time
Soak Time 1 Soak Time 2
LUR1
LUR2
LUR3
Dwell Time 1
Dwell Time 2
Single Ramp up Rate
MW
Real-Time Availability
Single Ramp
up Rate
RUR3
Ramp up Break Point
RUR2
Ramp up Break Point
RUR1
MINGEN
Time
Dwell Time 1 Dwell Time 2
Single Ramp up Rate
The Single Ramp up Rate calculation is:
= (Max(Availability) – Min(Minimum Generation))/RampUpTime
The Single Ramp Down Rate calculation is:
= (Max(Availability) – Min(Minimum Generation))/RampDownTime
Single Ramp down Rate
MW
Real-Time Availability
RDR3
Ramp Down Break
Point 2
RDR2
Ramp Down Break
Point 1
RDR1
MINGEN
DLR2
Deloading Break
Point
DLR1
Time
Dwell Time 2
Dwell Time 1
Single Ramp down Rate
MW
Real-Time Availability
(MAXGEN)
RDR3
Single Ramp
down Rate
Ramp Down Break
Point 2
RDR2
Ramp Down Break
Point 1
RDR1
MINGEN
Time
Dwell Time 2
Dwell Time 1
Overview of Changes in the T&SC
Registration Data
VTOD
Spot Values
Profiled values
Other relevant
parameters
T&SC current Minimum Generation
Name
Minimum Stable
Generation
Outturn Minimum Stable
Generation
Minimum Stable
Generation
Minimum Output
T&SC new
Name
Lower Registered Output
Minimum Generation
Outturn Minimum Stable
Generation
Minimum Stable
Generation
Minimum Output
T&SC
Glossary
What it is
incorrect
Ok
Ok
incorrect
Ok
The registered value of MINOUT
(Minimum Output), which is zero for all
units except Pumped Storage (-73) and
Interconnectors (in the systems this
value is zero for all units except PS)
The value of minimum
stable generation for the
unit, which is the
minimum at which it can
generate.
The spot values of
declared minimum
availability i.e. the lowest
output at which a
generator can generate
at a moment in time
The profiled value of
the outturn minimum
stable generation
values
Minimum Output (zero
for all units except PS)
The T&SC term "Minimum Generation"
is renamed “Lower Registered Output".
New glossary definition.
Change VTOD
parameter in T&SC to
"Minimum Generation".
Change Glossary
definition of Minimum
Generation to correctly
define this parameter
No change required
Correct Glossary
definition.
No change required
Change
proposed
Lower Registered Output: means the
minimum level of Output at which a
Generator Unit may operate submitted
for the Generator Unit in accordance
with Appendix H: "Participant and Unit
Registration and Deregistration". Lower
Registered Output is zero except for
Pumped Storage Units, for which the
Lower Registered Output shall be equal
to the pumping capability.
Minimum Generation
means the minimum
MW Output which a
Generator Unit can
generate continuously.
Minimum Stable
Generation means
the time weighted
average Outturn
Minimum Stable
Generation for each
Trading Period within
the Trading Day for a
Generator Unit,
calculated as
described in Section
4.49.
Single Ramp up Rate – proposed changes
The Single Ramp up Rate calculation is:
If max(AAuh) <= MinGenTOD then
(MaxGenTOD – max(min(Minimum Stable Generation), MinGenTOD)))
/RampUpTime
else
(max(AAuh) – max(min(Minimum Stable Generation), MinGenTOD)))
/RampUpTime
And similarly for the Single Ramp Down Rate.