A new robust DTC-SVM for high performance induction machine drives

Abstract

Fig. 1. DTC-SVM. Under the assumed orientation, the electromagnetic torque is calculated by (1) (2) (3) stronger performance of interferences for the inside and outside perturbation without depending on the controlled system mathematics model, making the all system works with better robustness and adaptability. It brings new meaning to the notion of robustness and disturbance rejection [4]. where usd and u sq are the direct component and the quadrature component ofthe applied voltage vector. R s is the stator resistance. i sd and i sq are the direct and quadrature component of the stator current respectively. we is the synchronous angular speed. f//s is the stator flux, np is the pole pairs, and T e is the electromagnetic torque. II. CONTROL METHOD A. DTC-SVM Overview The block diagram of DTC-SVM in stator-flux-oriented (SFO) coordinates is shown in Fig.l. The control strategy relies on a description of the stator voltage components, expressed in stator flux reference frame as [5]:Abstract-The well-known direct torque control (DTC) is a very simple control method for inverter-fed AC drives, which characterized by fast dynamic response, structural simplicity, and low sensitivity to parameter changes. Attempts to combine DTC with SVM have led to new ways. This paper presents a new robust DTC-SVM for high performance induction machine drives. Sim ulation studies have been carried out for the proposed method and results are compared with traditional DTC-SVM. Simulation results show that the new scheme ensures good robustness and adaptability under modeling uncertainty and disturbances.

A Constant Switching Frequency DTC for PMSM Using Low Switching Losses SVM–An Experimental Result

“…Today Field Oriented Control (FOC) and Direct Torque Control (DTC) are considered the most important techniques to achieve high dynamic performance in AC machines [18]. DTC technique has been first proposed and applied for induction machines in the mid-1980s, by Takahachi and Noguchi, for low and medium power applications [9]- [14].…”

“…DTC technique has been first proposed and applied for induction machines in the mid-1980s, by Takahachi and Noguchi, for low and medium power applications [9]- [14]. The basic idea of DTC for an induction motor is to control the torque and flux linkage by selecting the voltage space vectors properly, which is based on the relationship between the slip frequency and torque [18]. This concept can also be applied to synchronous drives [10].…”