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It is very important that the quality of the energy obtained is at a high level while alternating energy is obtained from the direct current energy source. In order to improve the energy quality by reducing the harmonics in the generation of the alternating current, numerous studies have been done on multi-level inverter hardware structures and switching techniques. However, the effect of the slope formed by the difference between the levels in the generated multi-level alternating voltage structure on the resulting harmonic distortions has not been studied so far. So, the paper researches the effects of the inclination between the levels of the alternating voltage generated on load by the inverter. Firstly, after the multi-level inverter structure which can produce four levels of voltage is determined, the operation of this inverter is given in the tabular form. The value of voltage formation gradients (VFG) is calculated according to a generation of multi-level voltages with different amplitude sizes between the levels of the voltage on the R L load after simulation of the system is performed at the Matlab Simulink. After that, obtained load voltages at the simulation are validated in the experiment. The effects of these gradients on the quality of the voltages are determined by measuring harmonic distortions. When the distortion values obtained according to the slope of the alternating voltage structures are analysed, it is seen that the distortion values change significantly as the slope changes. Harmonic distortion caused by VFGs gives the appropriate source values that form voltage levels for the system. Therefore, if the harmonic distortion of the current produced in the load is to be reduced or eliminated, voltage levels of alternating must be generated according to the proposed VFG method.
Erol Can (Wed,) studied this question.
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