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Encryption-decryption-based distributed fault-tolerant consensus tracking control for multi-agent systems.

Yiliu Liu1, Chun Liu1, Xiaofan Wang1

  • 1School of Mechatronic Engineering and Automation, Shanghai University, Shanghai, 200444, China.

ISA Transactions
|August 30, 2024
PubMed
Summary
This summary is machine-generated.

This study presents a fault-tolerant consensus tracking strategy for multi-agent systems (MASs) that ensures secure communication against eavesdropping and compensates for actuator faults using an encryption-decryption strategy (EDS). The method achieves reliable leader-following consensus (LFC) despite system disturbances.

Keywords:
Actuator faultsEncryption–decryptionExternal eavesdroppersFault-tolerant consensus tracking controlMulti-agent systems

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Area of Science:

  • Control Systems Engineering
  • Networked Systems
  • Cybersecurity

Background:

  • Multi-agent systems (MASs) face challenges in achieving consensus tracking due to actuator faults and external eavesdropping threats.
  • Existing fault-tolerant control strategies may not adequately address security concerns or communication constraints in discrete-time MASs.

Purpose of the Study:

  • To develop a fault-tolerant consensus tracking (FCTC) protocol for discrete-time MASs that is robust against actuator faults and eavesdropping.
  • To design a decentralized observer for estimating system states and actuator faults.
  • To integrate an encryption-decryption strategy (EDS) for secure communication and fault compensation.

Main Methods:

  • Modeling actuator faults using difference equations.
  • Constructing decentralized observers for state and fault estimation.
  • Developing a distributed active FCTC protocol incorporating encrypted state information and estimated faults via EDS.
  • Deriving controller, observer, and dynamic encryption key criteria using compatible norms.

Main Results:

  • The proposed FCTC protocol effectively compensates for bias and drift actuator faults.
  • Secure communication is maintained, and communication congestion is alleviated.
  • The strategy achieves leader-following consensus (LFC) in the presence of faults and eavesdropping.
  • Simulation results validate the effectiveness of the encryption-decryption-based distributed FCTC strategy.

Conclusions:

  • The developed distributed FCTC strategy enhances the resilience and security of discrete-time MASs.
  • The integration of EDS with fault estimation provides a robust solution for secure consensus tracking.
  • The findings contribute to the advancement of secure and reliable control for networked systems.