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Curtin & PUCRS
Harmonic Characterization
Curtin & PUCRS
Harmonic Characterization
Curtin & PUCRS
Curtin & PUCRS
Curtin & PUCRS
Table of Contents
 Brazil
 PUCRS
 Introduction
 Objectives
 Power Quality
 Harmonic Characterization
 The Harmonic Mitigation Schemes
Curtin & PUCRS
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
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Passive Harmonic Trap Filters (HTF)
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Harmonic Trap Filters
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Using HTF for the 5th and 7th harmonic
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Harmonic amplitude in percent of the fundamental component
1.6
1.4
1.2
Using HTF for the 5th and 7th harmonic
PMSG output current
1.0
THD = 2.26 %
0.8
0.6
0.4
0.2
0.0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
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Using HTF for the 5th and 7th harmonic
PMSG output voltage
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Single-Switch Three-Phase Boost Rectifier
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Single-Switch
Three-Phase Boost Rectifier
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Three-phase PMSG output currents
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Three-phase bridge rectifier input currents
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PMSG output current
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PMSG output voltage
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Three-Phase Boost type PWM Rectifier
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Three-Phase Boost type PWM Rectifier
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Three-Phase Boost type PWM Rectifier IGBT
+ Diode current
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Three-Phase Boost type PWM Rectifier input
currents
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Three-Phase Boost type PWM Rectifier line
to line voltage
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PMSG output current
0.010
Harmonic amplitude in percent of the fundamental component
0.009
0.008
THD = 0.06 %
0.007
0.006
0.005
0.004
0.003
0.002
0.001
0.000
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
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PMSG output voltage
100.00
Harmonic amplitude in percent of the fundamental
component
90.00
80.00
70.00
60.00
50.00
40.00
30.00
THD = 96.25 %
20.00
10.00
0.00
1
101
201
301
401
501
601
701
801
901
1001
1101
1201
1301
1401
1501
1601
1701
1801
1901
Curtin & PUCRS
Table of Contents
 Brazil
 PUCRS
 Introduction
 Objectives
 Power Quality
 Harmonic Characterization
 The Harmonic Mitigation Schemes
 Power Losses
Curtin & PUCRS
Power Losses
 PMSG losses
 Bridge Rectifier Losses
 Harmonic Trap Filter Losses
 Semiconductor Losses
 Mechanical losses
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PMSG losses reference circuit
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PMSG losses
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PMSG losses
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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.
Curtin & PUCRS
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.
Curtin & PUCRS
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.
Curtin & PUCRS
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.
Curtin & PUCRS
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.
Curtin & PUCRS
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.