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Sensorless Adaptive Voltage Control for Classical DC-DC Converters Feeding Unknown Loads: A Generalized PI

Walter Gil-González1,2, Oscar Danilo Montoya3,4, Carlos Restrepo5

  • 1Facultad de Ingeniería, Institución Universitaria Pascual Bravo, Campus Robledo, Medellín 050036, Colombia.

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Summary
This summary is machine-generated.

This study introduces a passivity-based controller for DC-DC converters to regulate voltage under unknown loads. The novel approach ensures stability and improves performance compared to traditional methods.

Keywords:
averaging model in convertersgeneralized passivity-based controllerport-controlled hamiltonian systemssecond-order DC-DC converters

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Area of Science:

  • Electrical Engineering
  • Control Systems
  • Power Electronics

Background:

  • Voltage regulation in DC-DC converters is challenging with unknown loads.
  • Second-order converters like buck, boost, and buck-boost require advanced control strategies.

Purpose of the Study:

  • To develop a nonlinear control method for voltage regulation in DC-DC converters with unknown constant resistive loads.
  • To design a passivity-based controller with proportional-integral (PI) actions for improved stability and performance.

Main Methods:

  • Utilized averaging modeling to represent various DC-DC converter topologies using a generalized port-Controlled Hamiltonian (PCH) framework.
  • Designed a passivity-based controller with PI actions for asymptotic stability.
  • Implemented a linear integral estimator for unknown load value determination, reducing sensor requirements.

Main Results:

  • The PCH representation revealed a general bilinear structure in second-order DC-DC converters.
  • The passivity-based PI controller achieved voltage regulation with first-order behavior.
  • The integral load estimator demonstrated exponential convergence for load value estimation.

Conclusions:

  • The proposed PI passivity-based control effectively regulates voltage in DC-DC converters under varying unknown loads.
  • This method offers superior performance, avoiding oscillations seen with classical PI controllers.
  • The integral load estimator enhances control implementation by minimizing sensor needs.