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Abstract

In recent years, the multilevel DC/AC static converters are increasingly used for their benefits especially in terms of reduction of total harmonic distortion (THD) of the output current and reduced voltage stress on semiconductors at switching moments. In this article, a parallel structure of inverter is proposed for systems using photovoltaic panels. Although the proposed structure requires a number of voltage sources more than that used in other structures proposed in the literature, this structure has the advantage of being simple, contains only semiconductors for switching (no additional components as switching capacitors are required), and easy logic of control of semiconductors. The used modulation is based on the sinusoidal fundamental frequency pulse width modulation technique with single carrier. The proposed structure with its command scheme is adapted to voltage source inverter (VSI) applications. The inverter performances are evaluated through simulations in Matlab-Simulink environment on a nine-level inverter example.