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Measurement delay compensated LADRC based current controller design for PMSM drives with a simple parameter tuning

Chunqiang Liu1, Guangzhao Luo1, Zhe Chen1

  • 1School of Automation, Northwestern Polytechnical University, Xi'an, China.

ISA Transactions
|February 15, 2020
PubMed
Summary

This study introduces a new linear active disturbance rejection control (ADRC) for permanent magnet synchronous motor drives, simplifying parameter tuning. The method effectively compensates for measurement delays, improving control performance and application feasibility.

Keywords:
Current controlExtended state observerLinear active disturbance rejection controlPermanent magnet synchronous motor

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Area of Science:

  • Electrical Engineering
  • Control Systems

Background:

  • Parameter tuning of nonlinear active disturbance rejection control (ADRC) is a significant challenge for permanent magnet synchronous motor (PMSM) drives.
  • Existing methods struggle with nonlinearities, parameter variations, and measurement delays inherent in PMSM systems.

Purpose of the Study:

  • To propose a measurement delay-compensated linear active disturbance rejection control (LADRC) for PMSM drives.
  • To develop a simple and effective parameter tuning method for the proposed LADRC.

Main Methods:

  • An ideal model without resistance was acquired by estimating and canceling current coupling terms, dead-time effects, and motor parameter variations using a linear extended state observer.
  • An improved LADRC was developed to account for current measurement time delay, eliminating unmatched disturbance compensation issues.
  • A straightforward tuning method based on desired frequency bandwidth was derived from the LADRC controller's frequency characteristics.

Main Results:

  • The proposed LADRC effectively estimates and compensates for system uncertainties and measurement delays.
  • Frequency responses demonstrated effective current closed-loop gain and disturbance suppression.
  • The simple tuning method proved convenient for implementation.

Conclusions:

  • The developed measurement delay-compensated LADRC offers a practical solution for PMSM drives.
  • The proposed simple tuning method facilitates the application of ADRC by overcoming parameter tuning difficulties.
  • Experimental validation confirms the effectiveness and robustness of the proposed control strategy.