1. Dynamic Transfers Bob WECC MIC Meeting “The Last Hurrah!”
Hollywood, CA
Oct 13, 2011
Bob

2. Dynamic Transfers WECC MIC Meeting October 13, 2011
There are two types:
Dynamic Schedules
Pseudo-Ties
For the purposes of this presentation, we are considering a traditional bilateral world.

3. Dynamic Transfers WECC MIC Meeting October 13, 2011
Dynamic Schedules
Proposed NERC definition:
A time-varying energy transfer that is updated in real time and included in the Net Interchange Scheduled term in the same manner as an Interchange Schedule in the affected Balancing Authorities’ control ACE equations (or alternate control processes).
Typically used in the Southwest

4. Dynamic Transfers WECC MIC Meeting October 13, 2011
Pseudo-Ties
Proposed NERC definition:
A time-varying energy transfer that is updated in real time and included in the Net Interchange Actual term in the same manner as a Tie Line in the affected Balancing Authorities’ control ACE equations (or alternate control processes)
Typically used in the Northwest

5. Dynamic Transfers WECC MIC Meeting October 13, 2011
ACE Equation
Area Control Error =
(NIA - NIS) – 10β(FA - FS) – (other stuff)
Net Interchange Scheduled
Net Interchange Actual

6. Dynamic Transfers WECC MIC Meeting October 13, 2011
Common Items
Both types use a dynamic transfer signal
Both type apply the signal to certain ACE equation components
Both types require transmission arrangements from Source to Sink
Both types support “capacity with energy up and down” transactions

7. Dynamic Transfers WECC MIC Meeting October 13, 2011
UnCommon Items
Various services maybe required by “host” or “Native” BA for dynamic schedules but not necessarily for pseudo-ties.

8. BA 1 BA 2 Interchange or Tie-Line Metering
Dynamic Transfers WECC MIC Meeting October 13, 2011
Interchange or Tie-Line Metering
Applied to both ACE equations’ NIA but with opposite signs
EMS 1
EMS 2
BA 1 M
BA 2

9. Dynamic Schedule for Load
Dynamic Transfers WECC MIC Meeting October 13, 2011
Dynamic Schedule for Load
Dynamic Signal applied to both ACE equations’ NIS but with opposite signs
EMS 1
EMS 2
BA 1 M M
BA 2

10. BA 1 BA 2 Pseudo-Tie for Load
Dynamic Transfers WECC MIC Meeting October 13, 2011
Pseudo-Tie for Load
Dynamic Signal applied to both ACE equations’ NIA but with opposite signs
EMS 1
EMS 2
BA 1
BA 1 M M
BA 2

11. Dynamic Schedule for Generation
Dynamic Transfers WECC MIC Meeting October 13, 2011
Dynamic Schedule for Generation
Dynamic Signal applied to both ACE equations’ NIS but with opposite signs
EMS 1
EMS 2
BA 1 M G M
BA 2

12. Pseudo-Tie for Generation
Dynamic Transfers WECC MIC Meeting October 13, 2011
Pseudo-Tie for Generation
Dynamic Signal applied to both ACE equations’ NIA but with opposite signs
EMS 1
EMS 2
BA 1 M G M
BA 2
BA 2

13. Dynamic Transfers WECC MIC Meeting October 13, 2011
e-Tags and Dynamic Transfers
The tag is just a front, a representation, a place-holder
Dynamic Schedule e-Tags do not impact Scheduled Interchange before the fact or in real-time
The tag does not control the dynamic MWs so e-Tag curtailments will not on their own limit or change the dynamic transfer signal
Dynamic Schedule e-Tags will impact after-the-fact Scheduled Interchange values, so ATF adjustments are needed

14. Dynamic Transfers WECC MIC Meeting October 13, 2011
What is DSS?
Dynamic Scheduling System – a special infrastructure to facilitate multiple shorter-term deals
The DSS e-Tag “programs” or sets-up the communications and other aspects of the deal
The tag does not control the dynamic MWs
e-Tag curtailments are respected by DSS
DSS provides the after-the-fact Scheduled Interchange values

15. Dynamic Transfers WECC MIC Meeting October 13, 2011
DSS on 1 Day
BA1 is supplying capacity with energy changeable within the hour to both BA2 and BA3 via the DSS
EMS 1
BA 1
DSS
EMS 2
EMS 3
BA 2
BA 3

16. Dynamic Transfers WECC MIC Meeting October 13, 2011
DSS on Next Day
Both BA1 and BA2 are supplying capacity with energy changeable within the hour to BA3 via the DSS
EMS 1
BA 1
DSS
EMS 2
EMS 3
BA 2
BA 3

17. Dynamic Transfers WECC MIC Meeting October 13, 2011
And DSS Next Quarter
BA3 is supplying capacity with energy changeable within the hour to both BA1 and BA2 via the DSS
EMS 1
BA 1
DSS
EMS 2
EMS 3
BA 2
BA 3

18. Dynamic Transfers WECC MIC Meeting October 13, 2011
What are Dynamic Transfer Limits?
Amount of MW transfer determines the receiving end voltage
For large transfers, voltage management is critical to system reliability
Can impact automatic and manual switching of reactive devices and Remedial Action Scheme arming

19. Dynamic Transfers WECC MIC Meeting October 13, 2011
What are Dynamic Transfer Limits? ∆V ∆P
receiving end voltage
transferred power

20. Dynamic Transfers WECC MIC Meeting October 13, 2011
Want More?
NERC Dynamic Transfer Reference Guidelines June 2010
Dynamic Transfer Capability Task Force Phase 1 Report on ColumbiaGrid web site
Sharon Helms for DSS information
Out for comment, revised WECC INT draft criterion for Dynamic Transfers
In 2013, revised NERC INT standards

21. Dynamic Transfers WECC MIC Meeting October 13, 2011
Questions????