FPGA implementation of space vector PWM for speed control of 3-phase induction motor

Abstract

Advancements in solid state and Programmable Logic Devices have given a tremendous support to digital control techniques for speed control of motors. Space Vector PWM (SVPWM) is a sophisticated technique for generating a sine wave that provides a higher source voltage utilization and lower total harmonic distortion. Also, it is inherently suitable for digital implementation of vector control (Field Oriented Control) of AC motors. FPGAs due to their parallel processing capability, high sampling frequency and flexibility, are preferred for implementing various PWM techniques for controlling motor speed. Also, the transient response of the system is improved. In our work, we have combined these two technologies to produce a highly efficient speed control system for three phase IM. The switching pulses to six IGBTs were generated using the FPGA, and depending upon the switching sequence the inverter output voltage, was controlled. The results for hardware implementation of SPWM and SVPWM techniques are given and the two techniques are compared.