FPGA-based DTC-SVM: A comparative study between two approaches

Abstract

In the conventional Direct Torque Control (DTC) the stator flux and the electromagnetic torque have high ripples due to the switching frequency variations. To fix it, the Space Vector Modulation (SVM) is used in this paper. This paper aims firstly to develop a novel DTC-SVM structure based Sliding Mode (SM) controllers to overcome the DTC-SVM based PI controllers limitations, such as the sensitivity to the external disturbances and the parameter variations. Secondly, this paper deals to reduce the sampling period of the system utilizing the Field Programmable Array (FPGA). The conventional DTC, DTC-SVM with PI controllers and the DTC-SVM with SM controllers are developed, designed from Xilinx system generator tool, implemented on the FPGA-Virtex-5 ML507, and then compared in terms of ripples and the stator resistance variation. It has been noticed that the DTC-SVM with SM controllers provides a torque and flux with very low ripples and it is robust under stator resistance variations.