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Power System Restoration with the Help of a Case-Based Expert System

Power System Restoration with the Help of a Case-Based Expert System. N. Chowdhury Power Systems Research Group University of Saskatchewan Saskatoon, Canada. INTRODUCTION. Blackouts Rare in a modern power system Cause huge financial losses System Operators

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Power System Restoration with the Help of a Case-Based Expert System

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  1. Power System Restoration with the Help of a Case-Based Expert System • N. Chowdhury • Power Systems Research Group • University of Saskatchewan • Saskatoon, Canada

  2. INTRODUCTION • Blackouts • Rare in a modern power system • Cause huge financial losses • System Operators • Do not gain enough working knowledge and experience on restoration • Should be trained to restore their systems

  3. INTRODUCTION • Restoration • Operator Training • Expert Systems • Rule-Based:if (Condition 1)Action 1; else if(Condition 2)Action 2; elseAction 3; • Case-Based:Identify New Problem Consult Case Library Propose Solution • Why Case-Based Expert Systems ?

  4. AN INTELLIGENT TRAINING AGENT

  5. OBJECT-ORIENTED GUI

  6. CASE-BASED REASONING SUBSYSTEM

  7. FUNCTIONS OF THE CBR • Analyzes and diagnoses the current situation • Extracts the main features of the current situation • Determines an index for the situation • Searches for similar cases in the case library

  8. FUNCTIONS OF THE CBR • Recommends the best matched case • The best matched case is modified to suit the need • A restoration plan is suggested

  9. SUBUNITS OF THE CBR • Case Representation Unit • Situation Recognition Unit • Case Analyzer • Case Adapter • Case Executor • Case Organizer

  10. GRAPHICAL USER INTERFACE:DRAW OBJECT SELECT PASTE DRAG

  11. GRAPHICAL USER INTERFACE:EDIT

  12. IMPLEMENTATION:CASE LIBRARY

  13. SIMULATION:TEST ISLAND • Blackstart: CC and ML units • Non Blackstart: LD unit

  14. SIMULATION:STRATEGY • Path Selection • Restoration Power Source • Number of Switching Actions • Test Island • CASE 1:CC - ER - LD • CASE 2:CC - BR - NB - LD • CASE 3:CC - QE - NB - LD • CASE 4:QE - NB - LD • CASE 5:QE - CC - ER - LD

  15. SIMULATION:OBJECTIVES • Scenarios • Faulty Components • LINES E1L, C3B, Q1N and Q2N Total Blackout • Target • LD Plant Restoration

  16. SIMULATION:BLACKOUT

  17. SIMULATION:PROPOSAL

  18. SIMULATION:RESTORATION

  19. ACTION CHECKING

  20. A CASE DESCRPTION FOR SASKPOWER

  21. POSTDISTURBANCE CONDITIONS • Nipawin #1 to #3 units off line • Nipawin #401 to #403 breakers open • E.B. Campbell #1 to #8 units off line • E.B. Campbell #401 to #408 breakers open • CE #916 and #917 breakers open • Manitoba Hydro available

  22. A SOLUTION PROPOSAL

  23. CONCLUSIONS • CBR based systems can be used to train and assist system operators • GUI will enhance the learning of system operators • A case library, the vital part of a CBR system, is system specific • Seed cases have to be developed to initiate the recognition process • NO RULES: Designing is simple and straightforward

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