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Modeling of electric ship power systems bob hebner
- 1. Modeling of Electric Ship Power Systems A. Ouroua, B. Murphy, J. Herbst, and R. Hebner University of Texas at Austin
- 2. Power system option summary Power Generation Power Conditioning & Distribution Power Conversion Power Consumption Fuel AC or DC Transmission? Motors Loads Transformers Converters Ship Services Ship Services Prime Movers Generators M1 PWM Induction Pulse Loads Rectifier M2 Synchro Synchro./Sep. Exc. Propulsion M3 Cyclo Synchro./PM Diesel Engine Gear M4 G1 Variable Reluctance Synchro./Sep. Exc. Direct Drive M5 G2 Gas Turbine Synchro./PM Optional Energy Storage Propeller Super-conductive G3 M6 Super-conductive Nuclear Power Plant Homo/hetero Polar G4 Homo/hetero Polar Podded Propulsion Non-podded Propulsion Fuel Cells Motor + propeller in single unit Motor on board
- 4. Permits prediction of
- 5. Stability
- 6. Load flow
- 7. Transient responses
- 9. System model Pulsed loads Simulink, ACSL, VTB
- 12. Bearing failure
- 14. About 0.5 MW
- 15. Upper Half
- 17. Ground faults
- 18. Series faults
- 19. Step load changes
- 20. Response of particular interest
- 21. Surge generation due to stray inductance and filter capacitance
- 22. Transient circuit representation of faults
- 23. Transient circuit representation of capacitors
- 24. Power transients exceeding steady-state source ratings
- 25. Interest due to surge effects
- 26. Insulation
- 28. Pre-breakdown
- 29. Post-breakdown
- 30. Develop equivalent circuit from physics-based model
- 31. Integrate fault circuit model into power circuit model
- 32. Validate results using test gridTo be done
- 34. 483 to 10,243 grid points
- 37. Shape
- 38. Free path
- 40. Computation of potential distribution Electric field structure becomes complex during discharge propagation
- 41. Equivalent circuits Pre-breakdown Post-breakdown
- 42. Notional temporal behavior Magnitude Time Pre-breakdown Post-breakdown
- 43. Circuit models can generate “experience base” Insulation Design Steps Supporting Technology Knowledge of insulation medium Material evaluation Statistical analysis High voltage testing Discharge phenomena research Measurement (aging, space charge, dielectric, partial discharge, etc.) Knowledge of an insulation component Evaluation of a way to give a design criterion Design Stress Database of ; Insulation medium evaluation parameters Results of insulation component model and mock up model tests E50 (Area, thickness, volume effect) = x (1 - ns) Deterioration factor Temperature factor Experiences and past records Safety factor Evaluation of influential factors on insulation performance Insulation coordination Electromagnetic field computation Electromagnetic transient analysis Evaluation of voltages applied to apparatus Insulation example
- 45. Other insulation fails under transient conditions
- 46. Land-based
- 47. Switching surges
- 48. Lightning
- 49. MVDS for ships
- 50. Likely switching surges
- 51. Expect switching surges to be different
- 54. Ground faults
- 55. Series faults
- 56. Step load changes
- 57. Response of particular interest
- 58. Surge generation due to stray inductance and filter capacitance
- 59. Transient circuit representation of faults
- 60. Transient circuit representation of capacitors
- 61. Power transients exceeding steady-state source ratings
- 62. Interest due to surge effects
- 63. Insulation