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Three phase multi level inverter for high power applications

This paper proposes a three phase seventeen-level inverter for grid-connected photovoltaic systems, with a novel pulse width-modulated (PWM) control scheme. The proposed topology constitutes the conventional three-phase bridge with three bidirectional switches. A multilevel dc link using PV cells and cascaded half-bridge is connected in such a way that the proposed inverter outputs the required output voltage levels. For the purpose of increasing the number of voltage levels with fewer number of power electronic components, the structure of the proposed inverter is extended and different methods to determine the magnitudes of utilized dc voltage supplies are suggested.