Symmetrical multilevel inverter with hybrid PWM strategies

In this paper various new hybrid PWM strategies for sine-trapezoidal reference with triangular carrier PWM signals are analyzed with the new symmetrical nine level inverter topology. This new multilevel level inverter uses only ten switches rather than conventional multilevel inverter uses sixteen switches for the same nine level output. The topology has many advantages of less switching losses, converter cost and installation cost. The inverter is analysed with PWM strategies like PD, APOD and also with various new hybrid PWM strategies such as PD + VF, PD + CO, APOD + VF, APOD + CO, PD + VF + CO and APOD + VF + CO. The proposed multilevel inverter is investigated with these techniques in MATLAB/SIMULINK. The power quality issues such as Total Harmonics Distortion and Fundamental RMS voltages are analysed by comparing this strategy. As a result, the total harmonic distortion is lower in PD + VF PWM strategy and fundamental RMS voltage is higher in APOD + VF + CO PWM strategy.