Virtual%20Resistance

1
Virtual Resistance
Line conditioner Block Diagram
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Converter Control
3
Experimental Results
Prototype
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Control Signals
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ac-ac converter voltage signals
Rectifier
Inverter
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Operation with Load Transient
Without Virtual Resistance Control Loop
With Virtual Resistance Control Loop
50 Load Transient
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Operation with input Transient
20 transient in input voltage Vi(t)
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Operation with input Transient
-20 transient in input voltage Vi(t).
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Operation with input Transient
THD correction
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Nonlinear load Operation
The greatest requirements in terms of dynamic
response.

11
Conclusions

• Experimental Results

• The control strategy was efficient with
  instantaneous correction of the output voltage
  when faced with input voltage and load
  variations

• Capability of supplying an output voltage with
  low harmonic distortion

• When presented with the worst case scenario, a
  nonlinear load, the conditioner studied was able
  to correct the THD to fit the required standards
  of 5 (IEEE519/92)

12
Conclusions

• Contributions

A generalization of serial line conditioners
was presented through 12 possible topologies
This work focused on the study of a serial
line conditioner with an ac-ac indirect converter
with direct link, fed by load side. The
capacitive filter was positioned on the load side
to make use of the line impedance as a
multi-functional filter
A control strategy was introduced to
efficiently stabilize the output voltage of the
studied structure .
13
Conclusions

• Future works

• Study of three-phase voltage line conditioners

- Space vector Modulation
- Digital Control and Nonlinear Control
Techniques
- Study of Rectifier control techniques
- Study of combined series and shunt active power
filters for simultaneous compensation of voltage
and current
- Hybrid and Matrix Converters
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The End