Observer based fault tolerant control for a class of Two-PMSMs systems

Area of Science:

• Electrical Engineering
• Control Systems
• Robotics

Background:

• Coupled permanent magnet synchronous motors (PMSMs) are crucial in many industrial applications.
• Actuator faults can degrade system performance and lead to instability.
• Existing fault-tolerant control (FTC) methods may require detailed fault information.

Purpose of the Study:

• To propose an observer-based state-feedback fault-tolerant controller for a two-coupled PMSM system.
• To estimate actuator faults using a robust adaptive observer.
• To ensure the closed-loop system's robust stability under actuator faults.

Main Methods:

• Design of a robust adaptive observer to estimate actuator faults.
• Computation of equilibrium control inputs and reference speeds using the system's mathematical model.
• Derivation of the variation dynamic model.
• Stability analysis using Lyapunov theory and interval matrices.
• Solving linear matrix inequalities (LMIs) to obtain controller gains.

Main Results:

• Successful estimation of system actuator faults.
• Demonstration of the fault-tolerant controller's ability to maintain system states.
• Verification of robust stability for the closed-loop system.
• Validation of the proposed FTC scheme's effectiveness through simulations.

Conclusions:

• The proposed observer-based fault-tolerant control scheme effectively compensates for actuator faults in two-coupled PMSM systems.
• The robust adaptive observer accurately estimates faults, enabling stable system operation.
• The controller ensures robust stability, validated by Lyapunov theory and LMIs.