A Two Level Unified Space Vector Pulse Width Modulation for Field Oriented Control of Induction Motor

Abstract

In this paper, space vector pulse width modulation (SVPWM) to control the speed of an induction motor fed with Zsource inverter is presented. In recent years, the field oriented control (FOC) of induction motor drive is widely used in high performance drive system due to its high efficiency, good power factor and extremely rugged property. The Z-source inverter is also introduced to the system which employs a unique LC network to couple the inverter main circuit to the diode front end. By controlling the shoot-through duty cycle, the Z-source can produce any desired output ac voltage, even greater than the line voltage. As results, the new Z-source inverter system provides ride-through capability under voltage sags, reduces line harmonics, and extends output voltage range.