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Distribution Automation Systems With Advanced Features

Distribution Automation Systems With Advanced Features. Richard Greer, American Electric Power Will Allen, Jim Schnegg, and Andrew Dulmage, Schweitzer Engineering Laboratories, Inc. Loop Scheme. Wide-Area Control System Example. Complex systems may benefit from wide-area control.

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Distribution Automation Systems With Advanced Features

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  1. Distribution Automation Systems With Advanced Features Richard Greer, American Electric Power Will Allen,Jim Schnegg, andAndrew Dulmage, Schweitzer Engineering Laboratories, Inc.

  2. Loop Scheme

  3. Wide-Area Control System Example Complex systems may benefit from wide-area control

  4. Wide-Area Control Objectives • Service restoration • Miscoordination detection • Dynamic load balancing and load shedding • Data sharing with adjacent control areas • Communications link failure detection • Enhanced situational awareness

  5. Example Distribution Network

  6. Control System Architecture

  7. Information Exchanged BetweenDAC and IEDs • Switch open / close indication • Live- / dead-voltage indication • Load current • Fault current indication • Recloser lockout indication • Abnormal condition indication • Various Commands

  8. Sequence of Operation

  9. DAC ObjectivesReconfigure After Event • Permanent fault • Open-phase conductor • Miscoordination • Multiple faults • Overload condition

  10. DAC ObjectivesObserve Constraints • Abnormal conditions • Power system limits • Protection considerations

  11. Source 4 Is Lost

  12. Source 4 Is Lost

  13. Source 4 Is Lost

  14. Choosing Best Alternate for ReconfigurationsLoading Considerations • Load to restore • Equipment ratings • Conductor sizes • Sectionalizing Needed?

  15. Conductors at R12 Overload

  16. Conductors at R12 Overload

  17. Conductors at R12 Overload

  18. Settings Groups Follow Sources

  19. Reconfiguration Example

  20. Reconfiguration Example

  21. Reconfiguration Example

  22. Miscoordination Detection

  23. Recover From Miscoordination

  24. Return to Normal • Automated “one-touch” sequence • Switch positions • Settings groups • Operation modes • Closed transition • Open transition • Settings groups only

  25. Return-to-Normal Configuration

  26. Return-to-Normal Configuration

  27. Multiple DACs

  28. System ExpansionMultiple Controller Architecture

  29. Communication:Will It Always Be There?

  30. Communications Link Fails at R2

  31. Loop Scheme Without Communications

  32. DA Scheme and Loop Scheme Combined

  33. Monitoring Communications Links

  34. Transfer Automatically to Backup Scheme

  35. Communications Link Failure • Communication to R2 control lost • R2 control and DAC detect loss • Automation on feeder disabled • Source 1 no longer available • R2 changes to backup mode • DAC activates backup mode in R1, R3, R4 and R5 controls

  36. Line Section CB H-R1 Faults,CB H Goes to Lockout

  37. R1 Opens to Isolate Fault

  38. R3 Closes to Restore Load

  39. Distribution System With Tie Points

  40. Automation Zone for CB A Feeder

  41. Automation Zone for CB B Feeder

  42. Automation Zone for CB C Feeder

  43. Communications Link to R1 Goes Down

  44. CB A Feeder Automation Zone Is Taken Out of Service by DAC

  45. Recloser Controls on Feeder Go Into Backup Loop Scheme Mode

  46. Feeder B Automation Zone Out of Service

  47. Feeder A, B, and C Automation Zones Out of Service

  48. Questions?

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