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Discrete-Time Adaptive Control for Three-Phase PWM Rectifier.

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  • 1School of Electrical Engineering, Shaanxi University of Technology, Hanzhong 723001, China.

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Summary
This summary is machine-generated.

This study introduces a dual-loop discrete-time adaptive control (DDAC) for three-phase PWM rectifiers. The DDAC method enhances robustness against inductance parameter mismatches and DC load disturbances, improving performance.

Keywords:
discrete-time adaptive controldiscrete-time feedback linearization controlinductance parameter mismatchesload disturbancethree-phase PWM rectifier

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Area of Science:

  • Electrical Engineering
  • Control Systems Engineering
  • Power Electronics

Background:

  • Three-phase PWM rectifiers are crucial in power conversion systems.
  • Parameter uncertainties and load variations challenge rectifier control performance.
  • Existing control methods often lack robustness to these disturbances.

Purpose of the Study:

  • To propose a novel dual-loop discrete-time adaptive control (DDAC) method for three-phase PWM rectifiers.
  • To enhance the robustness and adaptability of the rectifier control system to parameter mismatches and load disturbances.
  • To improve the steady-state and dynamic performance, and reduce current harmonics.

Main Methods:

  • A discrete-time model of the three-phase PWM rectifier was established using forward Euler discretization.
  • A dual-loop discrete-time feedback linearization control (DDFLC) was developed as a basis.
  • An adaptive inductance disturbance observer (AIDO) using gradient descent was implemented for the current loop.
  • A load parameter adaptive law (LPAL) based on discrete-time Lyapunov theory was designed for the voltage loop.

Main Results:

  • The AIDO effectively estimates and compensates for lumped disturbances from mismatched inductance parameters.
  • The LPAL accurately estimates and adapts to DC load parameter variations in real-time.
  • The DDAC demonstrated superior steady-state and dynamic performance compared to DDFLC and dual-loop discrete-time PI control (DDPIC).
  • The DDAC significantly reduced current harmonic content.

Conclusions:

  • The proposed DDAC method offers strong robustness to inductance parameter uncertainties and DC load disturbances.
  • The DDAC significantly improves control performance and reduces current harmonics in three-phase PWM rectifiers.
  • This adaptive control strategy provides a reliable solution for practical power electronic applications.