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A New Fast Control Strategy of Terminal Sliding Mode with Nonlinear Extended State Observer for Voltage Source

Chunguang Zhang1,2, Donglin Xu1, Jun Ma1

  • 1School of Automation and Electrical Engineering, Dalian Jiaotong University, Dalian 116028, China.

Sensors (Basel, Switzerland)
|April 28, 2023
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Summary
This summary is machine-generated.

This study introduces a fast terminal sliding mode control (FTSMC) combined with a nonlinear extended state observer (NLESO) to improve voltage source inverter (VSI) performance. The proposed method enhances tracking accuracy and disturbance rejection for VSIs.

Keywords:
extended state observerfast terminal sliding mode controluncertaintyvoltage source inverter

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Area of Science:

  • Electrical Engineering
  • Control Systems
  • Power Electronics

Background:

  • Voltage source inverters (VSIs) are sensitive to parameter variations and load changes.
  • Existing control methods struggle with aggregate system perturbations.

Purpose of the Study:

  • To develop a robust control strategy for single-phase VSIs.
  • To enhance VSI performance against parameter perturbations and load variations.

Main Methods:

  • Constructed a state-space averaging model for single-phase VSI dynamics.
  • Designed a nonlinear extended state observer (NLESO) using hyperbolic tangent functions for uncertainty estimation.
  • Implemented a fast terminal sliding mode control (FTSMC) with a fast terminal attractor.

Main Results:

  • The NLESO ensures estimation error convergence and preserves initial derivative peaks.
  • The FTSMC achieves high output voltage tracking accuracy and low total harmonic distortion.
  • The combined approach significantly enhances the anti-disturbance capability of the VSI.

Conclusions:

  • The proposed FTSMC-NLESO strategy offers a robust solution for VSI control.
  • This method effectively mitigates sensitivity to parameter perturbations and load variations.
  • The study demonstrates improved dynamic tracking and overall system stability.