1. Reconciling Power Flow (PF) with Production Cost Model (PCM) Cases
Donald Davies
Western Electricity Coordinating Council

2. Western Electricity Coordinating Council
Anchor Data Set
Proposal from Joint PCC-TEPPC Review Task Force (JPTRTF)
Task Force Report –
Anchor Data Set – Appendix B
Purposes –
Common representation of loads, resources, transmission 10 years in the future
Common foundation for load, resource, and transmission topology data
Consistent processes and protocols for gathering planning data
Western Electricity Coordinating Council

3. Western Electricity Coordinating Council
Anchor Data Set
Transmission Topology
Resources
Load Forecasts
Other – generator unit start-up times, variable O&M costs, emission costs
Western Electricity Coordinating Council

4. Recent Helpful SRWG Initiatives
SS – for station service load
Identification of Turbine Type
Identification of non-conforming loads
Identification of balancing authorities
Identification of Long IDs
Identification of Substations
Also helpful to match up to WSM
Identification of Netted generators with NT
Western Electricity Coordinating Council

5. Information from PF used by PCM
Generators Must Match
Load Location
Transmission Topology and Voltage Control
Status of Generator Step-up transformers
Adaptive Voltage Control
Transmission Topology Must Match
Generator Station Service Load
Generator Dispatch among units on River Systems and combined cycle plants
Western Electricity Coordinating Council

6. Western Electricity Coordinating Council
Generators Must Match
PCM Generators are indexed to PF generators
In some instances the PCM includes generators that are not represented in the PF or vice-versa
Suggested Solution:
Existing generators – Both PF and PCM Need to follow requirements of the Data Preparation Manual
Planned generators – Need to identify represented generators following processes in PCM and they need to be included in the PF with adequate transfer capability.
at high voltage buses if needed?
Include necessary transmission Enhancements.
Western Electricity Coordinating Council

7. Western Electricity Coordinating Council
Load Location
PCM Needs a credible load (geographical) pattern for as many hours as possible
Suggested Solution:
PF should identify BA for each load to match load forecast and hourly load profile used for PCM
PF should identify non-conforming loads and PCM should consider in locating BA level Loads
PCM can use multiple initial power flow cases with different load patterns (such as seasonal)
Western Electricity Coordinating Council

8. Status of Generator Step-up Transformers
The PCM needs step-up transformers closed, while PF cases often open step-up transformers for off-line units
Suggested Solution
Close all generator step-up transformers in moving from PF to PCM
Set generator status to off for generators at 0 output in moving from PCM to PF.
Western Electricity Coordinating Council

9. Adaptive Voltage Control
PCM does not consider Voltage Control, PF Requires appropriate voltage control
Suggested Solution:
Where possible – use automatic voltage control device operation, including when representing manual operator actions
Western Electricity Coordinating Council

10. Transmission Topology Must Match
The PF and the PCM need to represent the same future transmission projects
Suggested Solution:
Those compiling the PF should represent the transmission projects for the PF case to match the projects desired for the PCM
Other scenarios can be studied if automation (such as epcl code) is available to facilitate adding or removing identified transmission projects
Western Electricity Coordinating Council

11. Generator Station Service Load
PF should explicitly Identify Generator Station Service Load. PCM are currently set up to net station service load
Suggested Solution
Net station service load when loading a PF into a PCM
Unnet station service load when exporting a PF from the PCM if stability studies are required
Another option - Ignore this problem
Western Electricity Coordinating Council

12. Western Electricity Coordinating Council
Generator Dispatch among units on River Systems and combined cycle plants
In the PCM, River Systems and Combined Cycle Plants have over-simplifed allocation of output. A PF requires better allocation
Suggested Solution:
Determine where these over-simplifications occur in the PCM and either
do a better job of allocating output (may require program changes), or
do some kind of post processing when exporting to a power flow case
Western Electricity Coordinating Council

13. Western Electricity Coordinating Council
Donald Davies
Phone:
Western Electricity Coordinating Council