Abstract
This paper introduces a new solution for the speed and current sensor fault-tolerant direct field-oriented control of induction motor drives. Two self-adjusting observers derived from a modified current-based model reference adaptive system (CB-MRAS) are presented. Finally, the recursive least squares method was used to estimate the parameters of the used observers. The method, in the proposed solution, provides a very fast and accurate finding of the observer parameters while maintaining relative simplicity and ease of implementation. The presented algorithm eliminates the CB-MRAS observer dependence on the induction motor parameters and also compensates for the inaccuracies in the evaluation of the stator voltage vector. The proposed fault-tolerant control offers the drive operation while either a speed sensor or one/two current sensors fault occurs. The drive still works with the direct field-oriented control even when no current sensors are healthy. The proposed scheme was simulated in the MATLAB/Simulink software environment. Then the algorithm was implemented in a floating-point digital signal controller (DSC) TMS320F28335 and tested on an induction motor drive prototype of rated power of 2.2 kW to validate the proposed schemes.
Highlights
Induction motors are still among the most widely used machines for electromechanical energy conversion
The stator current vector estimation is based on a modified current-based model reference adaptive system (CB-model reference adaptive system (MRAS)) observer
The stator current vector estimation is based on a modified CB-MRAS observer (see reformulated the form: adaptive models defined in Equations (4) and (5) are reformuFigure 3)
Summary
Induction motors are still among the most widely used machines for electromechanical energy conversion. The proposed approach is independent of the motor parameters using a recursive least square method (RLS) to estimate the parameters of Energies 2021, 14, 2564 voltage vector (the input to the PWM, see Figure 1) can be directly used as the input to the observers and a nonlinear voltage-source inverter model (dead times compensation, voltage drops etc.) is not needed in the control scheme; The proposed fault-tolerant control offers the drive operation while a speed sensor or one/two current sensors fault occurs; The approach enables the drive operation in the direct field-oriented control (DFOC).
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have