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Harmonic Characterization

Harmonic Characterization. It seems O.K. Harmonic Characterization. Table of Contents. Brazil PUCRS Introduction Objectives Power Quality Harmonic Characterization The Harmonic Mitigation Schemes. The Harmonic Mitigation Schemes. Passive Harmonic Trap Filters (HTF)

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Harmonic Characterization

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  1. Harmonic Characterization It seems O.K.

  2. Harmonic Characterization

  3. Table of Contents • Brazil • PUCRS • Introduction • Objectives • Power Quality • Harmonic Characterization • The Harmonic Mitigation Schemes

  4. The Harmonic Mitigation Schemes • Passive Harmonic Trap Filters (HTF) • Single-Switch Three-Phase Boost Rectifier • Three-Phase Boost type PWM Rectifier (AC-DC converter) Objectives • Active Power Filter

  5. Passive Harmonic Trap Filters (HTF)

  6. Harmonic Trap Filters

  7. Using HTF for the 5th and 7th harmonic

  8. Using HTF for the 5th and 7th harmonic PMSG output current

  9. Using HTF for the 5th and 7th harmonic PMSG output voltage

  10. Single-Switch Three-Phase Boost Rectifier

  11. Single-Switch Three-Phase Boost Rectifier

  12. Three-phase PMSG output currents

  13. Three-phase bridge rectifier input currents

  14. PMSG output current

  15. PMSG output voltage

  16. Three-Phase Boost type PWM Rectifier

  17. Three-Phase Boost type PWM Rectifier

  18. Three-Phase Boost type PWM Rectifier IGBT + Diode current

  19. Three-Phase Boost type PWM Rectifier input currents

  20. Three-Phase Boost type PWM Rectifier line to line voltage

  21. PMSG output current

  22. PMSG output voltage

  23. Table of Contents • Brazil • PUCRS • Introduction • Objectives • Power Quality • Harmonic Characterization • The Harmonic Mitigation Schemes • Power Losses

  24. Power Losses • PMSG losses • Bridge Rectifier Losses • Harmonic Trap Filter Losses • Semiconductor Losses • Mechanical losses

  25. PMSG losses reference circuit

  26. PMSG losses

  27. PMSG losses

  28. Conclusions • In this work three well-known harmonic mitigation solutions were applied to PMSG WECS AC to DC conversion. They were the HTF, the PFC and the PWM. Harmonic trap filters are easily implemented by passive components but they are normally implemented with bulk components.

  29. Conclusions • Notwithstanding the HTF had presented the good THD results they are not the best solution once they are a matched solution for a specific operation point (wind speed and output power). The losses study also has demonstrated that the PMSG efficiency (η) remains practically constant and the system η is the lowest when the HTF are used.

  30. Conclusions • For these reasons, it is not a recommended way out to obtain harmonic mitigation on PMSG WECS. On the other hand, the single-switch three-phase boost rectifier has presented encouraged results. Such as: low current and voltage THD, simple power topology and control circuit, can work in all wind conditions and presents a real reduction of the PMSG total losses.

  31. Conclusions • Which allow expecting an increasing in the PMSG lifetime without reduction of the power capability. The main drawbacks of this topology are a) the conduction losses in the BR diodes and switch Q1 since the high RMS current value caused by the DCM operation and b) the high output voltage 1 kV. Both problems could be minimized using proper diodes and switch like IGBT.

  32. Conclusions • With the actual technology these problems could be easily solved. The PWM rectifier was studied once if this complex converter is possible to obtain ideal PF and THD. But the losses study has show results very closed to that obtained with the Single Switch Boost Converter. The main advantage is that with this converter is possible to work with output voltages around 600V in spite of 1000V.

  33. THANK YOU • It was a pleasure be here I have enjoy the last six months as the bets in work life. • Special thanks to: Professor Syed Islam and all staff members. • I hope see you again here or in BRAZIL.

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