Transient and steady states analysis of traction motor drive with regenerative braking and using modified direct torque control (SVM-DTC)

Direct torque control (DTC) is a suitable control method for electric drives which are supplied by inverters, specially voltage source inverters (VSI). This method has some advantages compared with other methods such as field oriented control (FOC) with some drawbacks like switching frequency variation, that leads to introduce DTC improvement methods. Using space vector modulator (SVM) in DTC structure is the most important method that is referred to as space vector modulator for direct torque control (SVM-DTC). Utilizing regenerative braking method in electrical transportation makes it necessary to analyze the traction motor behavior in regenerative braking mode. In this paper three major types of SVM-DTC are mentioned and SVM-DTC method with Closed-Loop Torque and Flux Control in the Stator flux coordinates is used for simulation of traction motor driver of Ghatar Shahri Esfahan Organization. Moreover, traction motor behavior in regenerative braking mode using SVM-DTC driver is simulated. The simulation results are analyzed in the paper.