Improved terminal sliding mode control based on MPC for LIM applied to linear metro

Area of Science:

• Electrical Engineering
• Control Systems
• Machine Dynamics

Background:

• Linear induction machines (LIMs) require advanced control strategies for optimal dynamic response.
• Conventional model predictive control methods face challenges in balancing coefficients and computation complexity.

Purpose of the Study:

• To introduce a novel Finite State-Model Predictive Voltage Control (FS-MPVC) integrated with Terminal Sliding Mode Control (TSMC).
• To enhance the dynamic response and speed tracking capabilities of Linear Induction Machines (LIMs) across their entire speed range.

Main Methods:

• Designed a Terminal Sliding Mode Control (TSMC) for the speed loop to achieve high tracking and faster transient response.
• Transformed control objectives to primary voltage control within the FS-MPVC framework, simplifying conventional methods.
• Developed and detailed the design and implementation steps for the integrated TSMC-MPVC strategy.

Main Results:

• The proposed TSMC-MPVC demonstrated superior performance in simulations compared to conventional methods.
• Effectiveness was verified across various speeds and load conditions for a 3 kW LIM.
• Achieved significant improvements in dynamic response and speed tracking accuracy.

Conclusions:

• The integrated TSMC-MPVC offers an effective and viable solution for improving LIM dynamic performance.
• The method addresses limitations of conventional approaches, providing a more robust control strategy.
• Validated through comprehensive simulations, the approach shows promise for practical applications in LIM control.