Research Information System
6th International Conference on Science and Technology, (Iconst), Budva, Montenegro, 30 August - 01 September 2023, pp.1-6
In this article, a one-phase seven-level inverter structure will be
examined and this inverter will be simulated in computer environment by using
Matlab Simulink program. Sinus triangle pulse width modulation will be used for
the control circuit of the inverter, and in order to generate the trigger
signal in this control structure, three peak value reference values, namely DC
component, will be added and rectified, and will be realized after comparing
the sinus signals with the same frequency with a carrier triangle signal. By
keeping the amplitude of the said carrier triangle signal constant and its
frequency being much higher than the reference rectified sine signals, the output
voltage of the inverter is provided to resemble a pure sine wave, and the
output current is provided to appear as almost pure sine with the load
containing the coil. Of course, because the inverter structure has seven
levels, sine triangle pulse width modulation is made here. In higher order
inverter topologies, the output voltage and current can be approximated to a
pure sine form without harmonic, even without applying sine-triangle pulse
width modulation. However, in such a case, the cost will increase because too
many semiconductors and voltage sources will be used. However, in the inverter
topology realized in this study, seven levels were obtained by using only six
mosfets. In addition, the voltage source is used as three equal-level voltage
sources by using 3 series-connected capacitors to the voltage source. These 3
different comparison signals, which are used for the inverter output voltage to
be seven-level, will enable the switches to turn on and off, respectively, in
the inverter structure, and with the pulse width modulation, the total harmonic
distortion will be reduced by approaching the pure sinus form of the output
voltage form. This inverter structure and everything described has been tested
only in the computer environment by means of the Matlab Simulink program, and
the realized circuit structure can be run correctly.