On Three-Phase Six-Switches Voltage Source Inverter: A 150° Conduction Mode

This paper presents a new modification for the most-common, simple, and well-known three-phase six-switch voltage source inverter (VSI). In this modification, each one of the six transistors conducts for 150deg instead of the known 180deg or 120deg conduction modes. For a wye-connected load, the output phase-voltage becomes a seven-level, 12 steps waveform. This results in a 50% reduction of the total harmonic distortion (THD), 75% reduction of voltage distortion factor (DF), and the lowest harmonic order (LOH) becomes 11 rather than 5. Comprehensive study for the three conduction modes is proposed, and a comparisons with other types of voltage source inverters, like the neutral point clamped (NPC) and the multilevel inverters (MLI) were also carried out. Simulation and experimental results show the contribution of the proposed strategy.