1. A Sample of Seldom Used Tools and other Power Flow Trivia
Tracy Rolstad
Avista System Planning
WECC PWSUG, 14 March 2012

2. GE Appears to Model One Shunt, but Displays Two

3. Carry Over from Case Read

4. Unique Levels of Aggregation
Injection Groups
Power plants, conforming load, etc
Substations
Collection of buses, loads, generators, etc
Auto extractable with Lat/Long
Interfaces
Path Rating catalog
Can contain numerous object elements

5. Use of Aggregation Provides Enhanced Capability
Substation Auto-extract
Quasi-GIS capability
Extract into ID, OR, WA borders
Or just ask Zach for his work!
Bubble Diagram
Uses interfaces and areas to emulate GE diagram
Super Area used in this…
Will post needed *.aux files and *.pwd files
Custom Case Information
Fills need for standard reporting

10. Ranking Importance of Buses or Substations
All lines in service
Flow based: MW, MVAr, Net Injections
Equipment Count
Contingency Based
Violation Count
RANK
Aggregate Overload
% or MVA
Gen or Load
Islands

15. N-1-1 Contingencies How do you know what to simulate?
The numbers can be overwhelming
Or perhaps not?
Use the Advanced LODF Tool
We will look at Puget’s sensitivities to ALL WECC 500 kV ctgs
Auto insert WECC 500 kV ctgs
Create PSE Limit Monitoring Group
Run Advanced LODF
Examine Results

23. LODF Tool Prediction Is?
Flow = MW "COVINGT4-RAVER“ And MONITORED BRANCH ! FLOW = MW LODF = "MAPLE V3-TALBOT N" So…. (-0.123) * ( MW) MW = MW should show up on the MapleV3—Talbot N line. Ugh, signs… 

24. YAY!

25. Well? PSE folks,
will these outages
load up the PSE system?

26. Setting Path Flows and Line Flows to Targets
Tools Used
Injection Group(s)
For this example it is an uber-group that is all WECC generation regardless of type, size, etc.
Interfaces
Line Loading Replicator

27. Creating All WECC Gen Group

28. Line Loading Replicator on Northern Intertie

29. Set Northern Intertie to Zero in 15 seconds

30. Results: Note Use of AGCable Flag

31. Going the other way by 2300 MW

32. Results from this: ~4600 MW Shift

33. Check Overloads and Generation Movement
The line loading replicator is NOT an OPF…no constraints
15 overloads in base case (max =211%)
80 overloads in adjusted case (max=216%, same line as above)

34. Questions