Enhanced Control Technique for Dual-Star Induction Machine Drive: A Fractional-Order Controller-Based DTC Approach with Virtual Voltages

Fractional calculus is the most popular form of control engineering in many fields, including electric drive applications. One of the most common applications in all fields of electric drives is the control of the dual-star induction machine (DSIM). Several control techniques have been proposed for this type of multiphase motor, ranging from classical PID-based methods to the most sophisticated advanced methods, including fractional-order controllers. Furthermore, in the case of a DSIM, which has been widely studied recently, inevitable harmonic currents are generated, which is a major problem and leads to increased losses and reduced system efficiency. Therefore, this paper presents a fractional order controller optimized using a dedicated method to improve system performance while minimizing overshoot, reducing response time, and minimizing rejection time, and a modified switching table has been developed to reduce harmonic currents using virtual voltage vectors. Simulation results validate the effectiveness of the proposed method.