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Nonlinear Robust Control For DC-DC Converters

Nonlinear Robust Control For DC-DC Converters. Soldatos P. Karamanakos K. Pavlou S. Manias. National Technical University of Athens. Outline. Introduction DC-DC Boost Converter Control Objective Controller Design Simulation Conclusions. Introduction.

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Nonlinear Robust Control For DC-DC Converters

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  1. Nonlinear Robust Control For DC-DC Converters • Soldatos P. Karamanakos K. Pavlou S. Manias National Technical University of Athens

  2. Outline Introduction DC-DC Boost Converter Control Objective Controller Design Simulation Conclusions

  3. Introduction DC-DC boost converters have been used widely for: Power Switching Supplies Battery Chargers PV Systems Lighting Systems Telecommunication Systems Electric Vehicles etc.

  4. I. Mathematical Representation DC-DC Boost Converter II. Averaged Model

  5. DC-DC Boost Converter III. Linearized Model Equilibrium Points is unknown but bounded disturbing input

  6. Control Objective Practical Stability , there is a positive Property P1:Uniform Boundedness. Given such that, for all solutions Property P2:Uniform Ultimate Boundedness. Given and such that, there is a non negative for all solutions

  7. Controller Design Given p(x) where and P is the solution of for given Q>0 and

  8. Controller Design vO iL

  9. Simulation Parameters

  10. Simulation Unknown load disturbance Input voltage disturbance

  11. Simulation Desired output voltage step change and actual output voltage

  12. Simulation Input voltage variations and corresponding output voltage

  13. Simulation Load resistance variations and corresponding output voltage

  14. Conclusions • Robust operation in an uncertain environment • Unknown but bounded disturbances • Setpoint tracking • Satisfactory transient and steady state characteristics • Constant switching frequency • Easy implementation

  15. Thank you for your attention

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