MOD_42_10v2 : Changes to the Single Ramp Up Rate and the Single Ramp Down Rate Calculation

Single Ramp Rate Availability Min Stable Generation Dwell Times Time Output (MW) Slope = Single Ramp Up Rate RAMP UP RAMP DOWN Slope = Single Ramp Down 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.

Single Ramp up Rate Time MW Block Load Load up Break Point 1 MINGEN Load up Break Point 2 Ramp up Break Point Soak Time 1 Soak Time 2 Dwell Time 1 Dwell Time 2 RUR3 RUR2 RUR1 LUR1LUR2LUR3 Real-Time Availability

Single Ramp up Rate Time MW MINGEN Ramp up Break Point Dwell Time 1 Dwell Time 2 RUR3 RUR2 RUR1 Single Ramp up Rate Real-Time Availability

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 up Rate

Single Ramp down Rate Time MW Deloading Break Point Real-Time Availability MINGEN Ramp Down Break Point 1 Ramp Down Break Point 2 Dwell Time 1 Dwell Time 2 RDR1 RDR2 RDR3 DLR2 DLR1

Single Ramp down Rate Time MW Real-Time Availability (MAXGEN) MINGEN Ramp Down Break Point 1 Ramp Down Break Point 2 Dwell Time 1 Dwell Time 2 RDR1 RDR2 RDR3 Single Ramp down Rate

Overview of Changes in the T&SC Registration DataVTODSpot ValuesProfiled valuesOther relevant parameters T&SC current Name Minimum GenerationMinimum Stable Generation Outturn Minimum Stable Generation Minimum Stable Generation Minimum Output T&SC new Name Lower Registered OutputMinimum GenerationOutturn Minimum Stable Generation Minimum Stable Generation Minimum Output T&SC Glossary incorrectOk incorrectOk What it isThe 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) Change proposed The T&SC term "Minimum Generation" is renamed “Lower Registered Output". New glossary definition. 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. Change VTOD parameter in T&SC to "Minimum Generation". Change Glossary definition of Minimum Generation to correctly define this parameter Minimum Generation means the minimum MW Output which a Generator Unit can generate continuously. No change requiredCorrect Glossary definition. 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 No change required

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. Single Ramp up Rate – proposed changes