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Virtual Resistance

Virtual Resistance. Line conditioner Block Diagram:. Converter Control. Experimental Results. Prototype. Control Signals. ac-ac converter voltage signals. Rectifier. Inverter. Operation with Load Transient. Without Virtual Resistance Control Loop. With Virtual Resistance Control Loop.

micah-hardy
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Virtual Resistance

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  1. Virtual Resistance Line conditioner Block Diagram:

  2. Converter Control

  3. Experimental Results Prototype

  4. Control Signals

  5. ac-ac converter voltage signals Rectifier Inverter

  6. Operation with Load Transient Without Virtual Resistance Control Loop With Virtual Resistance Control Loop 50% Load Transient

  7. Operation with input Transient • +20% transient in input voltage Vi(t):

  8. Operation with input Transient • -20% transient in input voltage Vi(t):.

  9. Operation with input Transient • THD correction:

  10. Nonlinear load Operation The greatest requirements in terms of dynamic response.

  11. Conclusions • Experimental Results: • The controlstrategywasefficient with instantaneouscorrection 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;

  14. The End

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