How the level shift of carrier in PWM inverter can be done in power electronics simulation in matlab

In single carrier pwm in single phase inverter of 5level inverter 2 carrier waves are used.In that one among them is level shifted.May I know how to shift that in simulation

[Venkata Praveen Telagarapu]

21 level

Answer 1

[ALBERT ALEXANDER STONIER]

You need to generate 4 carrier signals in which 2 are above the zero reference and 2 are below the zero reference for a single phase five level inverter. In 2016 version, you have the triangular waveform and in the earlier versions you have the saw-tooth waveform which need to be converted as a triangle. For level shifting consider this example above the zero reference. Example: Triangle 1: amplitude=[0 2 0] and time=[0 1 2] Triangle 2: amplitude=[2 4 2] and time=[0 1 2] Similarly, below the zero references can be obtained by giving negative values.