DC -> AC with IGBT's in SimuLink

Discussion in 'Programmer's Corner' started by Denniss, Dec 3, 2012.

  1. Denniss

    Thread Starter New Member

    Dec 3, 2012

    I'm trying to simulate a DC/AC-converter in Simulink. Input is a DC-source, which converts to AC and then feeds an inductor and resistor (see schematic.png). The IGBT switching frequency is 15 kHz, which is obtained from a comparison between a sawtooth and a sine wave from the frequency I want.
    When I want an output of 50 Hz, it works fine: both the voltage and current is a semi sine wave. But when I want for some reason an output frequency of 0.1 Hz, only the current is a sine wave (see output.png). Does anyone has experience with this kind of converters in Simulink who sees what is wrong with it?

    Thanks in advance