Comparative Analysis of Different Modulation Techniques for Three Level Three Phase T-type NPC Inverter

Multi-level Inverters (MLI) are commonly used in various industrial application due to low total harmonic distortion in the output voltage. Among multilevel inverters, the three-level inverters are widely used due to its reliability and simplicity. Three level T-type NPC inverter can be used as an efficient inverter for low/medium voltage application for medium switching frequency range. Different PWM techniques are used to control the multilevel inverters. This paper presents application of three different modulation techniques such as Sine PWM, Third harmonic injection PWM and Space vector modulation to three level three phase T-type NPC inverter and their performances are compared. Simulation and experimental results are presented for performance validation.