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Power Converter Systems Graduate Course EE8407

Power Converter Systems Graduate Course EE8407. Bin Wu PhD, PEng Professor ELCE Department Ryerson University Contact Info Office: ENG328 Tel: (416) 979-5000 ext: 6484 Email: bwu@ee.ryerson.ca http://www.ee.ryerson.ca/~bwu/. Ryerson Campus. Topic 4 Multi-pulse SCR Rectifiers.

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Power Converter Systems Graduate Course EE8407

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  1. Power Converter Systems Graduate Course EE8407 Bin Wu PhD, PEng Professor ELCE Department Ryerson University Contact Info Office: ENG328 Tel: (416) 979-5000 ext: 6484 Email: bwu@ee.ryerson.ca http://www.ee.ryerson.ca/~bwu/ Ryerson Campus

  2. Topic 4 Multi-pulse SCR Rectifiers

  3. Multi-pulse SCR Rectifiers • Lecture Topics • Six-pulse SCR Rectifier (Building Block) • 12-, 18- and 24-pulse SCR Rectifiers • THD and PF

  4. Multi-pulse SCR Rectifiers • Why Use Multi-pulse SCR Rectifiers? • To reduce line THD • To improve input power factor • To avoid semiconductor devices in series.

  5. Six-pulse SCR Rectifier • Converter Configuration • Assumption: 1) Ideal SCRs - no power loss • 2) dc current ripple free • Use constant current source Id as a load

  6. Six-pulse SCR Rectifier • Waveforms • Average dc voltage

  7. Six-pulse SCR Rectifier • Fourier Analysis • RMS current • THD

  8. Six-pulse SCR Rectifier • Power Factor (PF) • Displacement Power Factor • Overall Power Factor

  9. Six-pulse SCR Rectifier • Waveforms at Various Firing Angles

  10. Six-pulse SCR Rectifier • Effect of Line Inductance Ls

  11. Six-pulse SCR Rectifier • Waveform During SCR Commutation

  12. Six-pulse SCR Rectifier • DC Voltage Reduction (caused by commutation) • S1 and S5 on (during commutation) from which • Since ia + ic = Id, and id is constant from which

  13. Six-pulse SCR Rectifier • DC Voltage Reduction • Shaded Area Aγ • Since • Average dc voltage loss • Average dc output voltage

  14. Six-pulse SCR Rectifier • Commutation Interval • Aγ can be rearranged as where into the above equation • Substitute from which

  15. Six-pulse SCR Rectifier • Line Current Waveforms Ls = 0.05pu

  16. Six-pulse SCR Rectifier • Line Current THD

  17. Six-pulse SCR Rectifier • Power Factor

  18. 12-pulse SCR Rectifier • Topology • Main Benefits • - Low line current THD • - No SCRs in series

  19. 12-pulse SCR Rectifier • Application Example • Used for current source inverter (CSI) fed drive

  20. 12-pulse SCR Rectifier • Waveforms of Idealized Rectifier (Ls = Llk = 0)

  21. 12-pulse SCR Rectifier • Fourier Analysis • Secondary currents

  22. 12-pulse SCR Rectifier • Fourier Analysis (continued) • Secondary currents referred to the primary side • Primary line current

  23. 12-pulse SCR Rectifier • Line Current THD • Secondary side • Primary side

  24. 12-pulse SCR Rectifier • Line Current Waveform (Ls 0 )

  25. 12-pulse SCR Rectifier • THD and PF

  26. 18-pulse SCR Rectifier • Rectifier Configuration

  27. 18-pulse SCR Rectifier • Waveforms

  28. 18-pulse SCR Rectifier • Line Current THD

  29. 24-pulse SCR Rectifier • Rectifier Configuration

  30. 24-pulse SCR Rectifier • Line Current THD

  31. Thanks

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