Implementation of robust direct torque control of induction motor using FPGA Spartan-6 board

Abstract

This paper presents the implementation of space vector modulation-based direct torque control of an induction motor using a low-cost Spartan-6 XC6SLX25 FPGA board. The major advantages of FPGA compared to a DSP processor for the implementation of advanced control algorithms are parallel processing and less execution time. Most studies have employed FPGA for the implementation of a part of a control algorithm such as flux and torque estimators and torque and flux controllers. In this study, a complete control algorithm is executed in Spartan-6 board using VHDL code. The complete control algorithm is developed, which is independent of third parties such as Matlab/Simulink-based Xlilinx system generators. The complete experimental setup is developed using a speed sensor; Hall effect current voltage sensors are used for estimating the torque and flux of the motor. Based on the output of controllers, the PWM signals are fed to the VSI-fed induction motor. Xilinx ISE (Integrated Synthesis Environment) 14.1 is used to simulate synthesis and perform an analysis on the Spartan-6 board. The performance of the developed model is measured by perturbations in reference speed and load on the induction motor. The experimental results show that using FPGA, we can achieve fast speed response due to less execution time.