Generalized signal block diagram of the triangle intersection technique based PWM employing the zero sequence injection principle for 5 level inverter is show in figure 2. The zero sequence signal calculator generates the zero sequence signal(Vo) from the three phase sinusoidal reference signal.For all the modulation signal shown in Figure 3,triangular wave gain is assumed and signals are normalized to Vdc/2 .Therefore v voltage saturation limits correspond to 1