Performance Analysis of Different PWM Strategies For Three Phase Three-Level Diode Clamped Multi-Level Inverter
This paper presents unipolar pulse width modulation technique with sinusoidal sampling and Space vector pulse
width modulation are analyzed for three-phase Diode clamped multi-level inverter from the point of view of the Phase
voltages, currents, voltage across the split capacitors and Total harmonic distortion. The necessary calculations for
generation of PWM for the two modulation strategies have presented in detail. It is observed that the unipolar modulation
ensures excellent, close to optimized pulse distribution results but THD is high compared to SVPWM. Theoretical
investigations were confirmed by the digital simulations using MATLAB/SIMULINK software.
Keywords— Three-level diode clamped inverter; unipolar PWM; SVPWM; THD;