A simple SVM-based deadbeat direct torque control of induction motor drives

Direct torque control (DTC) is a kind of powerful control scheme for high performance control of induction motor (IM) drives, which provides very quick dynamic response with simple structure. However, the use of hysteresis comparators and predefined switching table lead to high torque ripple and variable switching frequency. To overcome the drawbacks of conventional DTC, this paper proposes a simple space vector modulation (SVM) based deadbeat DTC to achieve low torque ripple and fixed switching frequency, which is composed of two steps of deadbeat control. In the first step, the reference stator flux vector is obtained based on the principle of deadbeat torque control, and in the second step, the reference stator voltage vector to achieve deadbeat control of stator flux is obtained based on the stator voltage equation. No tuning work is required in the two steps, which is very simple and intuitive to understand. The reference voltage vector is then synthesized by the SVM block. The proposed deadbeat SVM-DTC can achieve excellent steady state performance and quick dynamic response over a wide speed range. Both simulation and experimental results are presented to validate its effectiveness.