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When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
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Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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Actuator fault tolerant control based on probabilistic ultimate bounds.

Noelia Pizzi1, Ernesto Kofman1, José A De Doná2

  • 1CIFASIS - CONICET, FCEIA - UNR, Argentina.

ISA Transactions
|October 22, 2018
PubMed
Summary

This study presents a novel fault tolerant control scheme for linear systems. It uses set-based detection and reconfiguration to handle actuator faults with minimal misdetection probability.

Keywords:
Fault diagnosisGaussian noiseProbabilistic ultimate bounds

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Area of Science:

  • Control Engineering
  • Systems Theory
  • Signal Processing

Background:

  • Linear systems are susceptible to actuator faults, which can compromise performance and stability.
  • Existing fault detection and diagnosis methods may struggle with Gaussian disturbances and require robust reconfiguration strategies.

Purpose of the Study:

  • To introduce a novel set-based fault tolerant control (FTC) scheme for linear systems.
  • To address actuator faults in the presence of Gaussian disturbances.
  • To ensure the preservation of closed-loop system features after fault reconfiguration.

Main Methods:

  • Utilizing set-based approaches for fault detection and diagnosis.
  • Computing probabilistic ultimate bounds for residual trajectories to identify faults.
  • Implementing a control reconfiguration strategy upon fault diagnosis.

Main Results:

  • The proposed FTC scheme effectively detects and diagnoses actuator faults.
  • Residual trajectories entering and remaining in predefined sets indicate fault occurrence.
  • The system can be reconfigured to maintain desired closed-loop characteristics post-fault.

Conclusions:

  • The developed set-based FTC scheme offers robust fault management for linear systems.
  • The strategy achieves arbitrarily small probabilities of fault misdetection.
  • This approach enhances system reliability and resilience against actuator failures.