1. Reinaldo Tonkoski Jr., Fernando Soares dos Reis,
UTILIZAÇÃO DE PFCS EM SISTEMAS DE CONVERSÃO DE ENERGIA EÓLICOS NA MINIMIZAÇÃO DE HARMÔNICOS C u r t i n & P U C R S
Reinaldo Tonkoski Jr., Fernando Soares dos Reis,
Jorge Villar Alé and Fabiano Daher Adegas;
Pontifical Catholic University of Rio Grande do Sul - Brazil
Syed Islam and Kelvin Tan,
Curtin University of Technology - Australia
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9. 2.4 MW Power Plant in the Northest
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10. 4.8 MW Power Plant in the South (8 x 600 kW)
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11. 5.0 MW Power Plant in the Northest 10 x 500 kW
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12. Table of Contents Introduction Objectives Power Quality
Harmonic Characterization
The Harmonic Mitigation Schemes
Power Losses
Conclusions
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13. INTRODUCTION
Permanent magnet synchronous generators (PMSG) wind energy conversion system (WECS) using variable speed operation is being used more frequently in wind turbine application. Variable speed systems have several advantages over the traditional method of operating wind turbines, such as the reduction of mechanical stress and an increase in energy capture. To allow the variable speed operation of the PMSG WECS a conventional three-phase bridge rectifier (BR) with a bulky capacitor associated with voltage source current controlled inverter (VS-CCI) is used.
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14. INTRODUCTION
This simple scheme introduces a high intensity low frequency current harmonic content into the PMSG and consequently increases the total loses in it. Subsequently, decreases the power capability of the system. This work presents a comparative simulation study between three different approaches applied to harmonic mitigation on PMSG WECS. The studied techniques are: a) harmonic trap filters (HTF), b) single-switch three-phase boost rectifier (PFC) and c) PWM Boost Rectifier.
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15. Turbinas de 10 a 100 kW
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16. WECS Wind Energy Conversion System
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17. Line-commutated inverter
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18. Current controlled inverter
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19. The Bridge Rectifier increases the losses.
AC-DC Conversion
Loss Reduction
The Bridge Rectifier increases the losses.
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20. Power Quality
The power quality concepts are well established and Widely applied in the relationship between utility and consumer;
Because it allows the maximization of the energy resources;
But these concepts were not normally applied to WECS once there are studies showing that the system efficiency is practically the some with or without harmonics in the PMSG.
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21. Harmonic Characterization
It seems O.K.
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22. Harmonic Characterization
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25. The Harmonic Mitigation Schemes
Passive Harmonic Trap Filters (HTF)
Single-Switch Three-Phase Boost Rectifier
Three-Phase Boost type PWM Rectifier (AC-DC converter)
Active Power Filter
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26. Passive Harmonic Trap Filters (HTF)
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27. Harmonic Trap Filters
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28. Using HTF for the 5th and 7th harmonic
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29. Using HTF for the 5th and 7th harmonic
PMSG output current
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30. Using HTF for the 5th and 7th harmonic
PMSG output voltage
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32. Single-Switch Three-Phase Boost Rectifier
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33. Single-Switch Three-Phase Boost Rectifier
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34. Three-phase PMSG output currents
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35. Three-phase bridge rectifier input currents
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36. PMSG output current
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37. PMSG output voltage
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38. Three-Phase Boost type PWM Rectifier
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39. Three-Phase Boost type PWM Rectifier
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40. Three-Phase Boost type PWM Rectifier IGBT + Diode current
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41. Three-Phase Boost type PWM Rectifier input currents
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42. PMSG output current
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43. Power Losses PMSG losses Bridge Rectifier Losses
Harmonic Trap Filter Losses
Semiconductor Losses
Mechanical losses
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44. PMSG losses reference circuit
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45. PMSG losses
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46. PMSG losses
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47. 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 Boost Rectifier. Harmonic trap filters are easily implemented by passive components but they are normally implemented with bulk components.
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48. 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 efficiency (η) is the lowest when the HTF are used.
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49. Conclusions
For these reasons, the HTF are 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.
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50. Conclusions
The PWM rectifier was studied once with 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.
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51. 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.
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52. THANK YOU!
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