Report on Real-time Grid Analysis Pilots

1. Report on Real-time Grid Analysis Pilots

2. Definitions Real-time Grid Analysis  Automated Load flow Analysis on each feeder at least every hour Automated and Continuous: Input Data collection and storage Analysis (Load Allocation with Load Flow) Operating status reporting and storage

3. More Definitions Fast Data  Data that can be accessed and used by central system within five seconds of data request Slow Data  Data that cannot be accessed within five seconds and usually not within hours of data request Bell Weather Meter  AMR or AMI meter that can be read in less than five seconds (Fast Data)

4. First Pilot Simple, small and lightly loaded feeder on the Owen Electric Cooperative system in Kentucky Phase A  2 meters on 1 transformer Phase B  57 meters on 43 transformers Phase C  10 meters on 7 transformers ------------------------------------------------------- Totals 69 51

5. Owen Pilot Feeder • All Overhead • No Line Regulators • No Line Capacitors • No 3ph Loads (meters) • Transformer size with assumed impedance values • No secondary information – meters connected directly to transformers

6. Pilot Feeder

7. Goals for First Pilot Run (Nov 2010) • IT Platform -- Automatically read and collect SCADA and AMR data: • QEI SCADA – Phase Amps , PF and Voltage every 15 minutes • Cooper AMR – kW and Voltage from each meter every hour (six to ten hours late) • Accomplished

8. Goals for First Pilot Run (Nov 2010) • Engineering Analysis Platform • Modify Load Allocation/Load Flow to automatically read and set Load Control Point amps, PF and voltage from most recently read SCADA data • Modify Load Allocation/Load Flow to automatically set meter billing loads from AMR data • Use kW usage from exactly one week ago • Run automatically on one hour cycle • Accomplished

9. Goals for First Pilot Run (Nov 2010) • Compare Calculated to Measured Voltages • Find low usage meters on low usage transformers to eliminate transformer and secondary drop • Compare calculated voltage to AMR voltage read at same time as SCADA data

10. Results of Voltage Comparison

11. Results of Voltage Comparison

12. Results of Voltage Comparison

13. Results of Voltage Comparison • While calculated voltages looked okay, we found a lack in correlation between measured AMR and SCADA voltages • We then discovered that SCADA was reading instantaneous voltage while AMR was reading one hour average voltage • Well DUH!!!!

14. Goals for Second Run (March 2011) • Determine if we could reconfigure SCADA and AMR so that both are reading 5 Min Ave Voltage • Thanks to Owen staff members, Jim See, Jim Petreshock and Tim Cammack this reconfiguration was accomplished. • Determine if Voltages would match if both on same time scale.

15. 5 Min Ave Volt Comparison

16. Difference less than Meter 1% Rating

17. Next Run (This Pilot) • Request data from SCADA and Bell Weather Meters at same time. • Determine time delay between data request and data return • SCADA is returning in one second or less • What will be the delay for AMR?

18. Next Pilots • Run typical feeders to test the use of Bell Weather meters • To determine kW load in synch with SCADA on large power loads • To determine voltage at output of regulator banks • To determine on/off status of capacitor banks • To determine voltage accuracy

19. Expand Pilots • Expand to typical feeder at Owen • Add feeders at: • Minnesota Valley • South Plains • Oklahoma Electric

20. Expand Pilots to Determine • What level of accuracy is required? • What does it take to accomplish this level of accuracy? • Is it possible to upscale from one feeder to entire systems? • What hardware is required? • What reporting and display functions are required? • Who needs to see what and when?

21. In Summary We still know much less than we know But we are progressing and believe we can make Real-time Grid Analysis a reality for Cooperatives and Municipals by 2014 Questions?