Sliding Mode-Based Sensorless Direct Torque Control Applied to Dual Induction Motors-Single Inverter System

In this paper, the application of Direct Torque Control (DTC) to a single-inverter system driving two induction machines is investigated, incorporating an advanced control strategy. Sliding Mode Control (SMC), specifically the Super-Twisting Algorithm (STA), is employed to replace conventional PI controllers for speed, flux, and torque regulation, overcoming their inherent limitations. Additionally, to eliminate the dependency on physical sensors, a super-twisting-based observer is proposed, enabling accurate estimation of the various quantities required by the control strategy. The system implements cooperative control to synchronize and efficiently manage the operation of the two motors. This technique provides an effective solution to challenges related to robustness in the presence of uncertainties and its ability to rapidly reject disturbances. However, it has some drawbacks, including rapid control actions that can generate vibrations or noise in the controlled system. Simulation results demonstrate that the proposed sensorless DTC-STA control achieves superior performance compared to conventional DTC.