Seven-level diode clamped inverter fed IPMSM drive for high power applications

Abstract

In recent years, multilevel inverters have become popular and widely accepted for high-power and high-voltage applications. Their performance is much superior to conventional two-level inverter as the level of the inverter increases. They produce superior quality output with less harmonic distortion. In this paper, simulation analysis of seven-level diode clamped inverter fed to interior permanent magnet synchronous motor (IPMSM) drive has been done for higher power applications. Two modulation techniques such as sinusoidal pulse width modulation (SPWM) and unified space vector pulse width modulation (USVPWM) are used. The carrier space vector pulse width modulation gives the same output reference wave as space vector pulse width modulation (SVPWM) without the actual calculation of the angle and sector location of space vector as in case of space vector modulation. The inverter output is fed to interior PMSM drive and the closed loop operation has been done using field oriented control (FOC). Speed-torque characteristics for various load conditions are studied. The output voltage and current harmonics are analysed for seven-level diode clamped inverter using SPWM and USVPWM techniques in MATLAB Simulink software.