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 RAMP DOWN Slope = Single Ramp Up Rate Availability Slope = Single Ramp Down Rate Dwell Times Min Stable Generation Time

Single Ramp up Rate

MW Real-Time Availability Ramp up Break Point Ramp up Break Point MINGEN Load up Break Point 2 Load up Break Point 1 Block Load LUR1 Soak Time 1 Soak Time 2 LUR2 LUR3 Dwell Time 1 Dwell Time 2 RUR3 RUR2 RUR1 Time

Single Ramp up Rate

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

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 Ramp Down Break Point 2 Ramp Down Break Point 1 MINGEN Deloading Break Point RDR3 Dwell Time 2 Dwell Time 1 RDR2 RDR1 DLR2 DLR1 Time

Single Ramp down Rate

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

Overview of Changes in the T&SC

T&SC current Name Minimum Generation Lower Registered Output T&SC new Name T&SC Glossary What it is incorrect Change proposed Registration Data VTOD Minimum Stable Generation Minimum Generation Ok Spot Values Outturn Minimum Stable Generation Outturn Minimum Stable Generation Ok Profiled values Minimum Stable Generation Minimum Stable Generation incorrect Other relevant parameters Minimum Output Minimum Output 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.

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 required Correct 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 4.49. No change required

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.